Submission #822087

#	Time	Username	Problem	Language	Result	Execution time	Memory
822087		boyliguanhan	Catfish Farm (IOI22_fish)	C++17	0 / 100	26 ms	3900 KiB

fish

#include "fish.h"

#include <bits/stdc++.h>
using namespace std;
long long fish[100100][2], dp[100100][2], dp2[100100][2], dpm[100100][2], dpm2[100100][2];
long long max_weights(int N, int M, vector<int> X, vector<int> Y, vector<int> W) {
    for(int i = 0; i < M; i++)
        fish[X[i]][Y[i]+1]=W[i];
    for(int i = 0; i < N; i++)
        for(int j = 1; j < N; j++)
            fish[i][j]+=fish[i][j-1];
    for(int l = 1; l < N; l++) {
        for(int i = 0; i <= N; i++) {
            for(int j = 0; j <= N; j++) {
                if(i<=j) {
                    dp[i][j] = dpm[j][N]+fish[l][j]-fish[l][i]; 
                } else {
                    dp[i][j] = dpm[j][j]+fish[l-1][i]-fish[l-1][j];
                    dp[i][j]=max(dp[i][j],dpm2[j][i]);
                    for(int k = j; k < i; k++)
                        dp[i][j] = max(dp[i][j], dp2[j][k]+fish[l-1][i]-fish[l-1][k]);
                }
            }
        }
        swap(dp, dp2);
        memset(dp, 0, sizeof dp);
        memcpy(dpm, dp2, sizeof dp2);
        memcpy(dpm2, dp2, sizeof dp2);
        for(int i = 0; i <= N; i++)
            for(int j = 1; j <= N; j++)
                dpm[i][j] = max(dpm[i][j-1], dpm[i][j]);
        for(int i = 0; i <= N; i++)
            for(int j = N; j--;)
                dpm2[i][j] = max(dpm2[i][j+1], dpm2[i][j]);
    }
    long long ans = 0;
    for(int i = 0; i <= N; i++)
        for(int j = 0; j <= N; j++)
            ans = max(ans, dp2[i][j]);
    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:16:40: warning: array subscript 2 is above array bounds of 'long long int [2]' [-Warray-bounds]
   16 |                     dp[i][j] = dpm[j][N]+fish[l][j]-fish[l][i];
      |                                ~~~~~~~~^

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