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Home Code Solutions Hackerrank Algorithms

Changing Bits – HackerRank Solution

Changing Bits - HackerRank Solution Java , Python 3, Python 2 , C , C++, Best and Optimal Solutions , All you need.

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August 24, 2022
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Table of Contents

  • Changing Bits – HackerRank Solution Java , Python 3, Python 2 , C , C++, Best and Optimal Solutions , All you need.
  • Solutions of Algorithms Data Structures Hard HackerRank:
    • Here are all the Solutions of Hard , Advanced , Expert Algorithms of Data Structure of Hacker Rank , Leave a comment for similar posts
  • C++ replace HackerRank Solution
  • Java rep HackerRank Solution
  • Python 3 rep HackerRank Solution
  • Python 2 rep HackerRank Solution
  • C rep HackerRank Solution
    • Warmup Implementation Strings Sorting Search Graph Theory Greedy Dynamic Programming Constructive Algorithms Bit Manipulation Recursion Game Theory NP Complete Debugging
    • Leave a comment below
      • Related posts:

Changing Bits – HackerRank Solution Java , Python 3, Python 2 , C , C++, Best and Optimal Solutions , All you need.

Solutions of Algorithms Data Structures Hard HackerRank:

Here are all the Solutions of Hard , Advanced , Expert Algorithms of Data Structure of Hacker Rank , Leave a comment for similar posts

C++ replace HackerRank Solution


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#include <iostream>
#include <cstring>
#include <cstdio>

using namespace std;

const int maxn = 100010;
int a[maxn], b[maxn], c[maxn];
int n, q;
char ss[maxn*5];
int l[maxn*2], r[maxn*2], s[maxn*2], tn;

int build(int ll, int rr)
{
	if(ll>=rr)
		return -1;
	int ret = tn++;
	if(ll + 1 == rr)
	{
		l[ret] = r[ret] = -1;
		s[ret] = c[ll];
		return ret;
	}
	int mid = (ll + rr) / 2;
	l[ret] = build(ll, mid);
	r[ret] = build(mid, rr);
	s[ret] = (s[l[ret]] == s[r[ret]] ? s[l[ret]] : 2);
	return ret;
}

void init() {
	scanf("%d%d", &n, &q);
	//printf("%d %d\n", n, q);
	memset(c, 0, sizeof(c));
	scanf("%s", ss);
	//printf("%s\n", ss);
	for(int i=0; i<n; ++i) {
		a[i] = c[i] = ss[n - i - 1] - '0';
	}
	scanf("%s", ss);
	//printf("%s\n", ss);
	for(int i=0; i<n; ++i) {
		b[i] = ss[n - 1 - i] - '0';
		c[i] += ss[n - 1 - i] - '0';
		if(c[i] >= 2)
		{
			c[i] -= 2;
			c[i+1] ++;
		}
	}
	a[n] = b[n] = 0;
	//memset(a, 0, sizeof(a));
	//memset(b, 0, sizeof(b));
	//memset(c, 0, sizeof(c));
	n++;
	tn = 0;
	build(0, n);
}

void push_down(int id) {
	if(s[id] == 2)
		return;
	if(l[id] < 0)
		return;
	s[l[id]] = s[r[id]] = s[id];
}

int findright(int id, int ll, int rr, int i, int bit)
{
	if(rr <= i)
		return -1;
	if(s[id] == bit)
		return i < ll ? ll : i;
	if(s[id] == (bit ^ 1))
		return -1;
	push_down(id);
	int mid = (ll + rr) / 2;
	int t = findright(l[id], ll, mid, i, bit);
	if(t >= 0)
		return t;
	return findright(r[id], mid, rr, i, bit);
}

void change(int id, int ll, int rr, int bl, int br, int bit)
{
	if(br <= ll || rr <= bl)
		return;
	if(bl <= ll && rr <= br)
	{
		s[id] = bit;
		return;
	}
	push_down(id);
	int mid = (ll + rr) / 2;
	change(l[id], ll, mid, bl, br, bit);
	change(r[id], mid, rr, bl, br, bit);
	if(s[l[id]] == s[r[id]])
		s[id] = s[l[id]];
	else
		s[id] = 2;
}

int getbit(int id, int ll, int rr, int i)
{
	if(i<ll || i>=rr)
		return 0;
	if(s[id] < 2)
		return s[id];
	int mid = (ll + rr) / 2;
	if(i < mid)
		return getbit(l[id], ll, mid, i);
	else
		return getbit(r[id], mid, rr, i);
}

void work() {
	int i, bit;
	int pn = 0;
	char cmd[10];
	while(q--) {
		scanf("%s", cmd);
		//printf("%s ", cmd);
		if(cmd[4]=='a' || cmd[4] == 'b')
		{
			scanf("%d%d", &i, &bit);
			//printf("%d %d\n", i, bit);
			if(cmd[4] == 'a' && a[i] == bit)
				continue;
			if(cmd[4] == 'b' && b[i] == bit)
				continue;
			if(cmd[4] == 'a') a[i] = bit;
			else b[i] = bit;
			int lmb = findright(0, 0, n, i, bit ^ 1);
			if(lmb == -1)
				lmb = n;
			change(0, 0, n, i, lmb, bit ^ 1);
			change(0, 0, n, lmb, lmb + 1, bit);
		}
		else
		{
			scanf("%d", &i);
			//printf("%d\n", i);
			ss[pn++] = getbit(0, 0, n, i) + '0';
			//printf("%c\n", ss[pn-1]);
		}
	}
	ss[pn] = 0;
	printf("%s\n", ss);
}

int main() {
	init();
	work();
}

Java rep HackerRank Solution


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import java.io.*;
import java.util.Random;
import java.util.StringTokenizer;

public class Solution {

    // leave empty to read from stdin/stdout
    private static final String TASK_NAME_FOR_IO = "";

    // file names
    private static final String FILE_IN = TASK_NAME_FOR_IO + ".in";
    private static final String FILE_OUT = TASK_NAME_FOR_IO + ".out";

    BufferedReader in;
    PrintWriter out;
    StringTokenizer tokenizer = new StringTokenizer("");

    public static void main(String[] args) {
        new Solution().run();
    }

    int n;
    int[] a, b, c;

    private void solve() throws IOException {
        // stress();
        // timing();

        n = nextInt();
        int q = nextInt();

        n++;
        a = toArray(nextToken());
        b = toArray(nextToken());
        c = sum(a, b);

        initFastStructures();

        for (int k = 0; k < q; k++) {
            String command = nextToken();

            if ("set_a".equals(command)) {

                int idx = nextInt();
                int value = nextInt();
                setSummandBitAndChangeSumFast(a, idx, value);

            } else if ("set_b".equals(command)) {

                int idx = nextInt();
                int value = nextInt();
                setSummandBitAndChangeSumFast(b, idx, value);

            } else {

                int idx = nextInt();
                int value = getSumNumberOfDigitsToTheRight(idx, 1) > 0 ? 1 : 0;
                out.print(value);

            }

        }
    }

    Random r = new Random(123456789L);

    private int randomInt(int lo, int hi) {
        return lo + r.nextInt(hi - lo + 1);
    }

    private int[] randomBitArray() {
        int[] result = new int[n];
        // the last bit is always empty
        for (int i = 0; i < n - 1; i++) {
            result[i] = randomInt(0, 1);
        }
        return result;
    }

    private void stress() throws IOException {
        for (; ; ) {
            n = randomInt(10, 20);
            int bitChanges = randomInt(100000, 100000);

            System.out.println("N = " + n + ", BitChanges = " + bitChanges);

            n++;
            a = randomBitArray();
            b = randomBitArray();
            c = sum(a, b);

            initFastStructures();

            for (int k = 0; k < bitChanges; k++) {
                int command = randomInt(0, 1);

                if (command == 0) {

                    int idx = randomInt(0, n - 2);
                    int value = 1 - a[idx];
                    setSummandBitAndChangeSumFast(a, idx, value);

                } else {

                    int idx = randomInt(0, n - 2);
                    int value = 1 - b[idx];
                    setSummandBitAndChangeSumFast(b, idx, value);

                }

                // validate all bits
                c = sum(a, b);
                for (int idx = 0; idx < n; idx++) {
                    int vSlow = c[idx];
                    int vFast = getSumNumberOfDigitsToTheRight(idx, 1) > 0 ? 1 : 0;
                    if (vSlow != vFast) {
                        throw new IllegalStateException("Step " + k + ": difference in bit " + idx + " out of " + n);
                    }
                }

            }
        }
    }

    private void timing() throws IOException {
        n = 100000;
        int q = 500000;

        n++;
        a = randomBitArray();
        b = randomBitArray();
        c = sum(a, b);

        initFastStructures();

        for (int k = 0; k < q; k++) {
            int command = randomInt(0, 2);

            if (command == 0) {

                int idx = randomInt(0, n - 2);
                int value = 1 - a[idx];
                setSummandBitAndChangeSumFast(a, idx, value);

            } else if (command == 1) {

                int idx = randomInt(0, n - 2);
                int value = 1 - b[idx];
                setSummandBitAndChangeSumFast(b, idx, value);

            } else {

                int idx = randomInt(0, n - 2);
                getSumNumberOfDigitsToTheRight(idx, 1);

            }

        }

    }

    private void setSummandBitAndChangeSumFast(int[] summand, int idx, int value) {

        if (summand[idx] == 0) {

            if (value == 0) {
                // do nothing, no bit change
            } else {
                summand[idx] = 1;
                increaseSumFast(idx);
            }

        } else {

            if (value == 1) {
                // do nothing, no bit change
            } else {
                summand[idx] = 0;
                decreaseSumFast(idx);
            }

        }

    }

    private void increaseSumFast(int idx) {

        // 0 -> 1                (numberOfOnes = 0)
        // 11111110 -> 00000001  (numberOfOnes > 0)

        int numberOfOnes = getSumNumberOfDigitsToTheRight(idx, 1);
        inverseSumBits(idx, idx + numberOfOnes);

    }

    private void decreaseSumFast(int idx) {

        // 1 -> 0                (numberOfOnes = 0)
        // 00000001 -> 10000000  (numberOfOnes > 0)

        int numberOfZeroes = getSumNumberOfDigitsToTheRight(idx, 0);
        inverseSumBits(idx, idx + numberOfZeroes);

    }

    // inverses all bits in ['lo', 'hi'] range
    private void inverseSumBits(int idxLo, int idxHi) {
        inverseTree(1, 0, tSize - 1, idxLo, idxHi);
    }

    // returns the number of consecutive digit 'digit' to the right of 'idx'
    private int getSumNumberOfDigitsToTheRight(int idx, int digit) {
        return searchTree(1, 0, tSize - 1, idx, tSize - 1, digit);
    }

    // converts string to number
    private int[] toArray(String s) {
        int[] result = new int[n];
        for (int i = 0; i < s.length(); i++) {
            result[i] = s.charAt(s.length() - (i + 1)) - '0';
        }
        return result;
    }

    // calculates sum of a and b. the sum will always fit into the length
    private int[] sum(int[] a, int[] b) {
        int[] result = new int[n];
        for (int i = 0, carry = 0; i < n; i++) {
            int d = a[i] + b[i] + carry;
            result[i] = d & 1;
            carry = d >> 1;
        }
        return result;
    }

    int tSize;
    TreeNode[] md;

    class TreeNode {

        boolean needToInverseChildren;

        boolean isLeaf;
        int lo, hi, len;
        int[] cntToRight = new int[2];

        TreeNode(boolean isLeaf, int lo, int hi) {
            this.isLeaf = isLeaf;
            this.lo = lo;
            this.hi = hi;
            this.len = hi - lo + 1;
        }

        void inverse() {
            int t = cntToRight[0];
            cntToRight[0] = cntToRight[1];
            cntToRight[1] = t;

            needToInverseChildren = !needToInverseChildren;
            if (isLeaf) {
                needToInverseChildren = false;
            }
        }

        void recalc(TreeNode l, TreeNode r) {
            for (int i = 0; i <= 1; i++) {
                cntToRight[i] = l.cntToRight[i];
                if (l.cntToRight[i] == l.len) {
                    cntToRight[i] += r.cntToRight[i];
                }
            }
        }

    }

    private void doPushdown(int k) {
        if (md[k].needToInverseChildren) {
            {
                int posL = k << 1;
                md[posL].inverse();
            }

            {
                int posR = (k << 1) + 1;
                md[posR].inverse();
            }

            md[k].needToInverseChildren = false;
        }
    }

    private int searchTree(int k, int a, int b, int lo, int hi, int digit) {
        if (hi < a || lo > b || a > b || lo > hi) {
            return 0;
        }

        if (a == lo && b == hi) {
            return md[k].cntToRight[digit];
        }

        int posL = k << 1;
        int posR = posL + 1;
        int mid = (a + b) / 2;

        doPushdown(k);
        int cntL = searchTree(posL, a, mid, lo, Math.min(hi, mid), digit);
        int cntR = searchTree(posR, mid + 1, b, Math.max(lo, mid + 1), hi, digit);
        md[k].recalc(md[posL], md[posR]);

        int result = cntL;
        int lenL = Math.max(Math.min(hi, mid) - lo + 1, 0);
        if (cntL == lenL) {
            result += cntR;
        }
        return result;
    }

    private void inverseTree(int k, int a, int b, int lo, int hi) {
        if (hi < a || lo > b || a > b || lo > hi) {
            return;
        }

        doPushdown(k);

        if (a == lo && b == hi) {
            // inverse
            md[k].inverse();
            return;
        }

        int posL = k << 1;
        int posR = posL + 1;
        int mid = (a + b) / 2;
        inverseTree(posL, a, mid, lo, Math.min(hi, mid));
        inverseTree(posR, mid + 1, b, Math.max(lo, mid + 1), hi);
        md[k].recalc(md[posL], md[posR]);
    }

    private TreeNode buildTree(int k, int a, int b) {
        if (k >= tSize) {
            int kIdx = k - tSize;
            if (kIdx < n) {
                // we are hitting a real node, so see what bit is that
                md[k] = new TreeNode(true, a, b);
                md[k].cntToRight[c[kIdx]]++;
            } else {
                // fake zero node
                md[k] = new TreeNode(true, a, b);
                md[k].cntToRight[0]++;
            }
            return md[k];
        }

        int mid = (a + b) / 2;
        TreeNode l = buildTree(k << 1, a, mid);
        TreeNode r = buildTree((k << 1) + 1, mid + 1, b);
        md[k] = new TreeNode(false, a, b);
        md[k].recalc(l, r);
        return md[k];
    }

    private void initFastStructures() {
        // build a tree out of d^p products
        tSize = 1;
        while (tSize < n) {
            tSize <<= 1;
        }

        //  1   2 3     4 5 6 7
        // [tsize - 1]  [tsize]
        int alloc = tSize << 1;
        md = new TreeNode[alloc];
        buildTree(1, 0, tSize - 1);
    }

    public void run() {
        long timeStart = System.currentTimeMillis();

        boolean fileIO = TASK_NAME_FOR_IO.length() > 0;
        try {

            if (fileIO) {
                in = new BufferedReader(new FileReader(FILE_IN));
                out = new PrintWriter(new BufferedWriter(new FileWriter(FILE_OUT)));
            } else {
                in = new BufferedReader(new InputStreamReader(System.in));
                out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));
            }

            solve();

            in.close();
            out.close();
        } catch (IOException e) {
            throw new IllegalStateException(e);
        }
        long timeEnd = System.currentTimeMillis();

        if (fileIO) {
            System.out.println("Time spent: " + (timeEnd - timeStart) + " ms");
        }
    }

    private String nextToken() throws IOException {
        while (!tokenizer.hasMoreTokens()) {
            String line = in.readLine();
            if (line == null) {
                return null;
            }
            tokenizer = new StringTokenizer(line);
        }
        return tokenizer.nextToken();
    }

    private int nextInt() throws IOException {
        return Integer.parseInt(nextToken());
    }

}



Python 3 rep HackerRank Solution


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Python 2 rep HackerRank Solution


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import sys

def  main():
	
	# get parameters
	parameters = raw_input().split()
	bitLength = int(parameters[0])
	numQueries = int(parameters[1])
	
	# get values for A and B
	numA = int(raw_input(), 2)
	numB = int(raw_input(), 2)
	
	# run queries
	for queryNum in range(numQueries):
		
		query = raw_input().split()
		command = query[0]
		index = int(query[1])
		
		if command == "set_a":
			
			set = query[2]
			if set == "1":
				numA = setBit(numA, index)
			else:
				numA = clearBit(numA, index)
				
		elif command == "set_b":
			
			set = query[2]
			if set == "1":
				numB = setBit(numB, index)
			else:
				numB = clearBit(numB, index)
				
		elif command == "get_c":
			
			bit = testBit(numA + numB, index)
			sys.stdout.write(bit)


def testBit(number, offset):
	mask = 1 << offset
	if number & mask:
		return "1"
	else:
		return "0"

def setBit(number, offset):
	mask = 1 << offset
	return(number | mask)

def clearBit(number, offset):
	mask = ~(1 << offset)
	return(number & mask)

if __name__ == "__main__":
	main()



C rep HackerRank Solution


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#define MAX_NUM ((unsigned int)-1)
#define WORD_SIZE 32
#define DATA_TYPE unsigned int
#include <stdio.h>
int main()
{
    DATA_TYPE A[3500] = {0}, B[3500] = {0}, C[3500] = {0};
    unsigned int CARRY[3500] = {0};
    int N, Q, N2;
    int idx, x, lowest_modified_idx=0;
    int i, j, rem;
    char cmd[10];
    char bit_string[100001];
    scanf("%d %d", &N, &Q);
    scanf("%s", bit_string);
    N2 = N/WORD_SIZE;
    rem = N % WORD_SIZE;

    for ( i = 0 ; i < N2 ; ++i )
        for ( j = 0 ; j < WORD_SIZE ; ++j )
            if ( bit_string[N - 1 - (i*WORD_SIZE + j)] == '1' )
                A[i] |= 1ULL << j;
    if ( rem )
        for ( j = 0 ; j < rem ; ++j )
            if ( bit_string[ rem - j - 1 ] == '1' )
                A[N2] |= 1ULL << j;
        
    
    scanf("%s", bit_string);

    for ( i = 0 ; i < N2 ; ++i )
        for ( j = 0 ; j < WORD_SIZE ; ++j )
            if ( bit_string[N - 1 - (i*WORD_SIZE + j)] == '1' )
                B[i] |= 1ULL << j;
    if ( rem )
        for ( j = 0 ; j < rem ; ++j )
            if ( bit_string[ rem - j - 1 ] == '1' )
                B[N2] |= 1ULL << j;    
    
    for ( ; Q ; --Q )
    {
        scanf("%s %d", cmd, &idx);
        switch(cmd[4])
        {
        case 'a':
            scanf("%d", &x);
            if ( x == 1 )
                A[idx/WORD_SIZE] |= (1ULL << (idx%WORD_SIZE));
            else
                A[idx/WORD_SIZE] &= ~(1ULL << (idx%WORD_SIZE));
            if ( idx < lowest_modified_idx )
              lowest_modified_idx = idx;
            break;
        case 'b':
            scanf("%d", &x);
            if ( x == 1 )
                B[idx/WORD_SIZE] |= (1ULL << (idx%WORD_SIZE));
            else
                B[idx/WORD_SIZE] &= ~(1ULL << (idx%WORD_SIZE));
            if ( idx < lowest_modified_idx )
              lowest_modified_idx = idx;
            break;
            
        case 'c':
            if ( idx >= lowest_modified_idx )
            { for ( i = lowest_modified_idx/WORD_SIZE ; i <= idx/WORD_SIZE ; ++i )
              {
                  CARRY[i+1] = 0;
                  if ( MAX_NUM - A[i] < B[i])
                     CARRY[i+1] = 1;
                  else if (A[i] < B[i] )
                  {    if ( MAX_NUM - A[i] - CARRY[i] < B[i] )
                          CARRY[i+1] = 1;
                  }
                  else if ( MAX_NUM - B[i] - CARRY[i] < A[i] )
                  {    CARRY[i+1] = 1;
                  }
                  C[i] = A[i] + B[i] + CARRY[i];
              }
              lowest_modified_idx = idx;
            }
            printf("%d", (C[idx/WORD_SIZE] & (1ULL << (idx%WORD_SIZE)))?1:0);
            break;
//        case 'd':
//            for ( j = rem ; j >= 0 ; --j )
//              printf("%d", (C[N/WORD_SIZE] & (1<<(j)))?1:0);
//              
//            for ( i = N/WORD_SIZE - 1 ; i >= 0; --i )
//              for ( j = WORD_SIZE-1;  j >= 0 ; --j )
//                printf("%d", (C[i] & (1<<j))?1:0);
//            printf("\n");
//            break;
        }
    }
}

 

Warmup
Implementation
Strings
Sorting
Search
Graph Theory
Greedy
Dynamic Programming
Constructive Algorithms
Bit Manipulation
Recursion
Game Theory
NP Complete
Debugging

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