Submission #1035761

#	Time	Username	Problem	Language	Result	Execution time	Memory
1035761		Andrey	Catfish Farm (IOI22_fish)	C++17	52 / 100	205 ms	319348 KiB

fish

#include "fish.h"
#include<bits/stdc++.h>
using namespace std;

long long haha[5001][5001];
long long dp[5001][5001][3];

long long max_weights(int n, int m, vector<int> x, vector<int> y,  vector<int> w) {
    for(long long i = 0; i <= n; i++) {
        for(long long j = 0; j <= n; j++) {
            haha[i][j] = 0;
        }
    }
    for(long long i = 0; i < m; i++) {
        haha[x[i]+1][y[i]+1] = w[i];
    }
    for(int i = 1; i <= n; i++) {
        for(int j = 1; j <= n; j++) {
            haha[i][j]+=haha[i][j-1];
        }
    }
    for(long long i = 0; i <= n; i++) {
        dp[0][i][0] = -LLONG_MAX/2;
        dp[0][i][1] = -LLONG_MAX/2;
        dp[0][i][2] = -LLONG_MAX/2;
    }
    dp[0][0][0] = 0;
    for(long long i = 1; i <= n; i++) {
        long long br = 0;
        for(int j = 0; j <= n; j++) {
            dp[i][j][0] = -LLONG_MAX/2;
            dp[i][j][1] = -LLONG_MAX/2;
            dp[i][j][2] = -LLONG_MAX/2;
        }
        long long x = -LLONG_MAX/2;
        for(long long j = n; j >= 0; j--) {
            x = max(x,max(dp[i-1][j][2],dp[i-1][j][0])+haha[i][j]);
            dp[i][j][2] = x-haha[i][j];
        }
        for(long long j = 0; j <= n; j++) {
            dp[i][j][1] = max(dp[i-1][j][0],dp[i-1][j][2])+haha[i][j];
        }
        x = -LLONG_MAX/2;
        for(long long j = 0; j <= n; j++) {
            x = max(x,dp[i-1][j][1]-haha[i-1][j]);
            dp[i][j][0] = max(dp[i][j][0],x+haha[i-1][j]);
            x = max(x,dp[i-1][j][0]-haha[i-1][j]);
        }
        x = -LLONG_MAX/2;
        for(long long j = n; j >= 0; j--) {
            x = max(x,dp[i-1][j][1]);
            dp[i][j][0] = max(dp[i][j][0],x);
        }
        /*for(long long j = 0; j <= n; j++) {
            br+=haha[i][j];
            long long sb1 = br,sb2 = 0;
            dp[i][j][1] = max(dp[i][j][1],max(dp[i-1][j][0],dp[i-1][j][2])+br);
            for(int k = 0; k <= n; k++) {
                if(k > j) {
                    sb1+=haha[i-1][k];
                    sb2+=haha[i-1][k];
                }
                else {
                    sb1-=haha[i][k];
                }
                if(k <= j) {
                    dp[i][k][2] = max(dp[i][k][2],max(dp[i-1][j][2],dp[i-1][j][0])+sb1);
                }
                else {
                    dp[i][k][0] = max(dp[i][k][0],dp[i-1][j][0]+sb1);
                }
                dp[i][k][0] = max(dp[i][k][0],dp[i-1][j][1]+sb2);
            }
        }*/
    }
    long long ans = 0;
    for(long long i = 0; i <= n; i++) {
        ans = max(ans,max(dp[n][i][0],dp[n][i][1]));
        ans = max(ans,dp[n][i][2]);
    }
    return ans;
}

Compilation message (stderr)

fish.cpp: In function 'long long int max_weights(int, int, std::vector<int>, std::vector<int>, std::vector<int>)':
fish.cpp:29:19: warning: unused variable 'br' [-Wunused-variable]
   29 |         long long br = 0;
      |                   ^~

• Subtask 1: 0 / 3
• Subtask 2: 0 / 6
• Subtask 3: 0 / 9
• Subtask 4: 14 / 14
• Subtask 5: 21 / 21
• Subtask 6: 17 / 17
• Subtask 7: 0 / 14
• Subtask 8: 0 / 16