Submission #828578

#	Time	Username	Problem	Language	Result	Execution time	Memory
828578		ttamx	Catfish Farm (IOI22_fish)	C++17	0 / 100	729 ms	154208 KiB

fish

#include "fish.h"
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int N=3005;
const ll inf=1e18;

int n,m;
ll w[N][N];
ll dp[N][N][2];

long long max_weights(int _n,int _m,vector<int> X,vector<int> Y,vector<int> W) {
	n=_n,m=_m;
	for(int i=0;i<m;i++)w[X[i]+1][Y[i]+1]=W[i];
	for(int i=1;i<=n;i++)for(int j=1;j<=n;j++)w[i][j]+=w[i][j-1];
	for(int i=1;i<=n;i++)for(int j=0;j<=n;j++)dp[i][j][0]=dp[i][j][1]=-inf;
	for(int i=1;i<=n;i++){
		ll tmp=-inf,tmp2=-inf;
		for(int j=0;j<=n;j++){
			tmp=max(tmp,dp[i-1][j][0]-w[i][j]-w[i-1][j]);
			dp[i][j][0]=w[i-1][j]+tmp+w[i+1][j];
		}
		tmp=-inf;
		for(int j=n;j>=0;j--){
			tmp=max(tmp,dp[i-1][j][1]);
			dp[i][j][1]=tmp-w[i][j]+w[i+1][j];
			dp[i][j][1]=max(dp[i][j][1],dp[i][j][0]);
		}
	}
	ll ans=0;
	for(int i=0;i<=n;i++)ans=max(ans,dp[n][i][1]);
	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:21:15: warning: unused variable 'tmp2' [-Wunused-variable]
   21 |   ll tmp=-inf,tmp2=-inf;
      |               ^~~~

• 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