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Home Code Solutions Hackerrank Algorithms

Mining – HackerRank Solution

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

admin by admin
August 23, 2022
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15 Days to learn SQL Hard SQL(Advanced)-Solution

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Table of Contents

  • Mining – 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:

Mining – 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 <bits/stdc++.h>
// iostream is too mainstream
#include <cstdio>
// bitch please
#include <iostream>
#include <algorithm>
#include <cstdlib>
#include <vector>
#include <set>
#include <map>
#include <queue>
#include <stack>
#include <list>
#include <cmath>
#include <iomanip>
#include <time.h>
#define dibs reserve
#define OVER9000 1234567890123456789LL
#define ALL_THE(CAKE,LIE) for(auto LIE =CAKE.begin(); LIE != CAKE.end(); LIE++)
#define tisic 47
#define soclose 1e-8
#define chocolate win
// so much chocolate
#define patkan 9
#define ff first
#define ss second
#define abs(x) ((x < 0)?-(x):x)
#define uint unsigned int
#define dbl long double
#define pi 3.14159265358979323846
using namespace std;
// mylittledoge

#ifdef DONLINE_JUDGE
	// palindromic tree is better than splay tree!
	#define lld I64d
#endif

int main() {
	cin.sync_with_stdio(0);
	cin.tie(0);
	cout << fixed << setprecision(10);
	int N,K;
	cin >> N >> K;
	vector<long long> W(N),X(N);
	for(int i =0; i < N; i++) cin >> X[i] >> W[i];
	vector<long long> sumW(N+1,0),sumWX(N+1,0);
	for(int i =0; i < N; i++) sumW[i+1] =sumW[i]+W[i], sumWX[i+1] =sumWX[i]+W[i]*X[i];
	vector< vector<long long> > ansL(K+1,vector<long long>(N+1,OVER9000));
	vector< vector<long long> > ansR(K+1,vector<long long>(N+1,OVER9000));
	ansR[0][0] =0;

	for(int i =0; i < N; i++) for(int k =0; k < K; k++) {
		if(K-k > N-i+3) continue;
		if(k > i+3) break;
		for(int j =i; j >= 0; j--) {
			ansL[k+1][i+1] =min(ansL[k+1][i+1],(ansR[k][j]+sumWX[j])-sumW[j]*X[i]);
			if(sumWX[j]-sumW[j]*X[i] > ansL[k+1][i+1]) break;}
		ansL[k+1][i+1] +=sumW[i+1]*X[i]-sumWX[i+1];
		for(int j =i; j >= 0; j--) {
			ansR[k+1][i+1] =min(ansR[k+1][i+1],(ansL[k+1][j+1]+X[j]*sumW[j]-sumWX[j])-X[j]*sumW[i+1]);
			if(X[j]*sumW[j]-sumWX[j]-X[j]*sumW[i+1] > ansR[k+1][i+1]) break;}
		ansR[k+1][i+1] +=sumWX[i+1];
		}

	cout << ansR[K][N] << "\n";
	return 0;}

// look at my code
// my code is amazing

Java rep HackerRank Solution


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import java.io.*;
import java.util.*;

public class CodeSprintJuly16qF {

    static int l, g;
    static long x[], w[];
    static long dp[][], cost[][], left[][], right[][];
    static long prefix[];
    static long inf = (long)1e17;
    
    public static void main(String args[]) {
        InputReader in = new InputReader(System.in);
        PrintWriter out = new PrintWriter(System.out);

        l = in.nextInt();
        g = in.nextInt();

        x = new long[l + 1];
        w = new long[l + 1];
        prefix = new long[l + 1];

        for (int i = 1; i <= l; i++) {
            x[i] = in.nextInt();
            w[i] = in.nextInt();
            prefix[i] = prefix[i - 1] + w[i];
        }
        
        left = new long[l + 1][l + 1];
        right = new long[l + 2][l + 2];

        for (int i = 1; i <= l; i++) {
            for (int j = i + 1; j <= l; j++) {
                left[i][j] = left[i][j - 1] + (x[j] - x[i]) * 1L * w[j];
            }
            for (int j = i - 1; j >= 1; j--) {
                right[i][j] = right[i][j + 1] + (x[i] - x[j]) * 1L * w[j];
            }
        }


        cost = new long[l + 1][l + 1];
        dp = new long[g + 1][l + 1];
        for (int i = 0; i <= l; i++)
            dp[0][i] = inf;
        
        int best = 1;
        for (int i = 2; i <= l; i++) {
            /*while (best < i) {
                long newCost = right[best + 1][1] + left[best + 1][i];
                long oldCost = right[best][1] + left[best][i];
                if (newCost < oldCost)
                    best++;
                else
                    break;
            }
            cost[0][i] = right[best][1] + left[best][i];*/
            cost[0][i] = dp[1][i] = right[i][1];
        }

      
        for (int i = 1; i <= l; i++) {
            best = i;
            for (int j = i; j <= l; j++) {
                while (best < j && cost(i, best + 1, j) < cost(i, best, j))
                    best++;
                cost[i][j] = cost(i, best, j);
                //System.out.println("cost " + i + " " + j + " " + best + " " + cost[i][j]);
            }
        }

        for (int d = 2; d <= g; d++)
            go(d, 1, l, 0, l);

        long ans = inf;
        for (int last = 1; last <= l; last++)
            ans = Math.min(ans, dp[g][last] + left[last][l]);
        out.println(ans);
        out.close();
    }

    static long cost(int i, int mid, int j) {
        return left(i, mid) + right(mid + 1, j);
    }

    static long left(int i, int j) {
        return left[i][j];
    }

    static long right(int i, int j) {
        return right[j][i];
    }

    static void go(int d, int s, int e, int optL, int optR) {
        if (s > e)
            return;
        int m = (s + e) >> 1, best = -1;
        dp[d][m] = inf;
        for (int i = optL; i <= optR && i < m; i++) {
            if (dp[d - 1][i] + cost(i, m) < dp[d][m]) {
                //if (d == 2 && m == 5)
                  //System.out.println("yyy " + i + " " + dp[d - 1][i] + " " + cost(i, m));
                dp[d][m] = dp[d - 1][i] + cost(i, m);
                best = i;
            }
        }
        //System.out.println("xxx " + d + " " + m + " " + dp[d][m]);
        go(d, s, m - 1, optL, best);
        go(d, m + 1, e, best, optR);
    }

    static long cost(int i, int j) {
        return cost[i][j];
    }

    static class InputReader {

        private final InputStream stream;
        private final byte[] buf = new byte[8192];
        private int curChar, snumChars;
        private SpaceCharFilter filter;

        public InputReader(InputStream stream) {
            this.stream = stream;
        }

        public int snext() {
            if (snumChars == -1)
                throw new InputMismatchException();
            if (curChar >= snumChars) {
                curChar = 0;
                try {
                    snumChars = stream.read(buf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                }
                if (snumChars <= 0)
                    return -1;
            }
            return buf[curChar++];
        }

        public int nextInt() {
            int c = snext();
            while (isSpaceChar(c)) {
                c = snext();
            }
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = snext();
            }
            int res = 0;
            do {
                if (c < '0' || c > '9')
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = snext();
            } while (!isSpaceChar(c));
            return res * sgn;
        }

        public long nextLong() {
            int c = snext();
            while (isSpaceChar(c)) {
                c = snext();
            }
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = snext();
            }
            long res = 0;
            do {
                if (c < '0' || c > '9')
                    throw new InputMismatchException();
                res *= 10;
                res += c - '0';
                c = snext();
            } while (!isSpaceChar(c));
            return res * sgn;
        }

        public int[] nextIntArray(int n) {
            int a[] = new int[n];
            for (int i = 0; i < n; i++) {
                a[i] = nextInt();
            }
            return a;
        }

        public String readString() {
            int c = snext();
            while (isSpaceChar(c)) {
                c = snext();
            }
            StringBuilder res = new StringBuilder();
            do {
                res.appendCodePoint(c);
                c = snext();
            } while (!isSpaceChar(c));
            return res.toString();
        }

        public boolean isSpaceChar(int c) {
            if (filter != null)
                return filter.isSpaceChar(c);
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

        public interface SpaceCharFilter {
            public boolean isSpaceChar(int ch);
        }
    }
}



Python 3 rep HackerRank Solution


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Python 2 rep HackerRank Solution


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C rep HackerRank Solution


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#include <stdio.h>

#define MAX 5001

typedef struct _Mine {
    int x;
    int w;
} Mine;

int n;
int k;
Mine  mines[MAX];
long long int ranges[MAX][MAX];
long long int score[MAX][MAX];

void calculateRanges()
{
    int i;
    int j;
    int ki;
    int wl;
    int wr;
    long long int tmp;

    for (i = 0; i < n; ++i) {
        ranges[i][i] = 0;
    }
    for (i = 0; i < n; ++i) {
        ki = i;
        wl = 0;
        wr = 0;
        for (j = i + 1; j < n; ++j) {
            ranges[i][j] = ranges[i][j-1] + (long long int) mines[j].w * (mines[j].x - mines[ki].x);
            wr += mines[j].w;

            while (ki < j) {
                tmp = ranges[i][j] + ((long long int) (wl + mines[ki].w) * (mines[ki+1].x - mines[ki].x)) - ((long long int) wr * (mines[ki+1].x - mines[ki].x));
                if (ranges[i][j] < tmp) {
                    break;
                }
                ranges[i][j] = tmp;
                wr -= mines[ki+1].w;
                wl += mines[ki].w;
                ki += 1;
            }
        }
    }
}

long long int calculateCost()
{
    int i;
    int j;
    int l;
    int index;

    for (i = 0; i < n; ++i) {
        score[i][1] = ranges[0][i];
    }

    for (i = 2; i <= k; ++i) {
        index = 0;
        for (j = i-1; j < n; ++j) {
            score[j][i] = score[index][i-1] + ranges[index+1][j];
            for (l = index+1; l < j; ++l) {
                if (score[l][i-1] + ranges[l+1][j] < score[j][i]) {
                    score[j][i] = score[l][i-1] + ranges[l+1][j];
                    index = l;
                }
            }
        }
    }

    return score[n-1][k];
}

int main() {
    int i;
    long long int res;

    scanf("%d %d", &n, &k);
    for (i = 0; i < n; ++i) {
        scanf("%d %d", &mines[i].x, &mines[i].w);
    }

    calculateRanges();
    res = calculateCost();

    printf("%lld\n", res);

    return 0;
}

 

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

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