Submission #1055633

#	Time	Username	Problem	Language	Result	Execution time	Memory
1055633		vjudge1	Catfish Farm (IOI22_fish)	C++17	35 / 100	1040 ms	455104 KiB

fish

#include "fish.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
set<int>fishies[3002];
ll FIS2;
ll dp[3010][2][3010],fishiess[3010][3010];
inline ll ones(int col,int len){
    return fishiess[col][len];
}
ll max_weights(int N,int M,vector<int> X,vector<int> Y,vector<int> W) {
    for(int i=0;i<M;i++)
        fishies[X[i]+1].insert(Y[i]+1),
        fishiess[X[i]+1][Y[i]+1]=W[i];
    for(int i=1;i<=N;i++)
        for(int j=1;j<=N+1;j++)
            fishiess[i][j]+=fishiess[i][j-1];
    for(int i=1;i<=N;i++)
        fishies[i].insert(1),
        fishies[i].insert(N+1);
    fishies[N+1].insert(0);
    for(auto i:fishies[1])
        dp[1][1][i-1]=ones(2,i-1);
    for(int i=2;i<=N;i++){
        for(auto rw:fishies[i]) {
            ll K=0;
            for(auto rw2: fishies[i-2]) { rw2--;
                K=max(K,max(dp[i-2][0][rw2],dp[i-2][1][rw2])+
                ones(i+1,rw-1)+max(0ll,ones(i-1,rw-1)-ones(i-1,rw2)));
            }
            dp[i][1][rw-1]=K;
        }
        for(auto rw:fishies[i-1]) { rw--;
            for(auto rw2:fishies[i]){
                if(rw2-1>rw) break;
                ll K=ones(i+1,rw2-1)-ones(i,rw2-1)+dp[i-1][0][rw];
                dp[i][0][rw2-1]=max(dp[i][0][rw2-1],K);
            }
        }
        for(auto rw:fishies[i-1]){rw--;
            for(auto rw2:fishies[i]){
                ll K=ones(i+1,rw2-1)-ones(i,min(rw,rw2-1))+
                    ones(i-1,rw2-1)-ones(i-1,min(rw2-1,rw))+dp[i-1][1][rw];
                dp[i][rw2>rw][rw2-1]=max(dp[i][rw2>rw][rw2-1],K);
            }
        }
    }

    ll ans=0;
    for(int i=0;i<=N;i++)
        ans=max({ans,dp[N][0][i],dp[N][1][i]});
    return ans;
}

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