Submission #829300

#	Time	Username	Problem	Language	Result	Execution time	Memory
829300		tolbi	Catfish Farm (IOI22_fish)	C++17	52 / 100	662 ms	508384 KiB

fish

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#include "fish.h"
ll dp[3001][3001][3];
int grid[3001][3001];
int N;
long long f(int x, int y, int flag){
    if (dp[x][y][flag]!=-1) return dp[x][y][flag];
    if (flag==1){
        dp[x][y][flag]=0;
        if (y<N){
            ll crr = 0;
            if (x>0) crr = grid[x-1][y];
            dp[x][y][flag]=crr+f(x,y+1,1);
        }
        if (x+1<N){
            dp[x][y][flag]=max(dp[x][y][flag],f(x+1,y,1));
            dp[x][y][flag]=max(dp[x][y][flag],f(x+1,y,0));
        }
    }
    else if (flag==0){
        dp[x][y][flag]=0;
        if (y-1>=0){
            dp[x][y][flag]=grid[x][y-1]+f(x,y-1,0);
        }
        if (x+1<N){
            dp[x][y][flag]=max(dp[x][y][flag],f(x+1,y,0));
            if (y==0){
                dp[x][y][flag]=max(dp[x][y][flag],f(x+1,y,2));
            }
        }
    }
    else {
        dp[x][y][flag]=0;
        if (y<N){
            dp[x][y][flag]=f(x,y+1,2);
        }
        if (x+1<N){
            dp[x][y][flag]=max(dp[x][y][flag],f(x+1,y,1));
            dp[x][y][flag]=max(dp[x][y][flag],f(x+1,y,0));
        }
    }
    if (flag!=0 && x+2<N){
        dp[x][y][flag]=max(dp[x][y][flag],f(x+2,0,1));
    }
    return dp[x][y][flag];
};

long long max_weights(int _N, int M, std::vector<int> X, std::vector<int> Y, std::vector<int> W) {
    N=_N;
    for (int i = 0; i < N+1; i++){
        for (int j = 0; j < N+1; j++){
            grid[i][j]=0;
            dp[i][j][0]=dp[i][j][1]=dp[i][j][2]=-1;
        }
    }
    for (int i = 0; i < M; ++i)
    {
        grid[X[i]][Y[i]]=W[i];
    }
    //0 decreasing
    //1 increasing
    //2 increasing, \
    but forbidden to profit from back
    return f(0,0,2);
}

Compilation message (stderr)

fish.cpp:64:5: warning: multi-line comment [-Wcomment]
   64 |     //2 increasing, \
      |     ^

• 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