Submission #1075748

#	Time	Username	Problem	Language	Result	Execution time	Memory
1075748		Muhammad_Aneeq	Catfish Farm (IOI22_fish)	C++17	18 / 100	71 ms	7380 KiB

fish

#include <vector>
using namespace std;
long long max_weights(int N, int M, vector<int> X, vector<int> Y,vector<int> W)
{
    bool subt1=1,subt2=1,subt3=1,subt4=(N<=300);
    for (int i=0;i<M;i++)
    {
        if (X[i]%2)
            subt1=0;
        if (X[i]>1)
            subt2=0;
        if (Y[i]!=0)
            subt3=0;
        if (Y[i]>8)
            subt4=0;
    }
    if (subt1)
    {
        long long sm=0;
        for (int i=0;i<M;i++)
            sm+=W[i];
        return sm;
    }
    if (subt2)
    {
        long long sm[N]={};
        long long val[N][2]={};
        for (int i=0;i<M;i++)
            val[Y[i]][X[i]]=W[i];
        sm[0]=val[0][1];
        for (int i=1;i<N;i++)
            sm[i]=sm[i-1]+val[i][1];
        long long ans=sm[N-1];
        long long x=0;
        for (int i=0;i<N;i++)
        {
            x+=val[i][0];
            if (N>2)
                ans=max(ans,x+sm[N-1]-sm[i]);
        }
        ans=max(ans,x);
        return ans;
    }
    if (subt3)
    {
        long long dp[N][2]={};
        int val[N]={};
        for (int i=0;i<M;i++)
            val[X[i]]=W[i];
        dp[0][0]=0,dp[0][1]=val[0];
        long long ans=0;
        long long mx=0;
        for (int i=1;i<N;i++)
        {
            if (i>1)
                dp[i][0]=mx+val[i];
            if (i<N-1)
                dp[i][1]=max(dp[i][0],dp[i-1][0]+val[i]);
            mx=max(mx,max(dp[i-1][0],dp[i-1][1]));
            ans=max(ans,max(dp[i][0],dp[i][1]));
        }
        return ans;
    }
    if (N<=3000)
    {
        vector<vector<vector<long long>>>dp(2,vector<vector<long long>>(N+10,vector<long long>(N+10,0)));
        long long val[N+10][N+10]={};
        for (int i=0;i<M;i++)
            val[X[i]+1][Y[i]+1]=W[i];
        long long pre[N][N]={};
        for (int i=0;i<=N;i++)
        {
            pre[i][0]=val[i][0];
            for (int j=1;j<=N;j++)
                pre[i][j]=pre[i][j-1]+val[i][j];
        }
        long long ans=0;
        for (int i=0;i<=N;i++)
            dp[0][0][i]=dp[1][0][i]=dp[0][i][0]=dp[1][i][0]=-1e17;;
        for (int i=1;i<=N;i++)
        {
            for (int j=0;j<N;j++)
            {
                for (int k=0;k<N;k++)
                {
                    if (j<k)
                    {
                        dp[0][i][j]=max(dp[0][i][j],dp[0][i-1][k]+pre[i][k]-pre[i][j]);
                        dp[1][i][k]=max(dp[1][i][k],dp[0][i-1][k]+pre[i][k]-pre[i][j]);
                    }
                    else
                    {
                        dp[0][i][j]=max(dp[0][i][j],dp[1][i-1][k]+pre[i-1][j]-pre[i-1][k]);
                        dp[1][i][j]=max(dp[1][i][j],dp[1][i-1][k]+pre[i-1][j]-pre[i-1][k]);
                    }
                }
                dp[1][i][j]=max(dp[1][i][j],dp[0][i-1][j]+pre[i][j]);
            }
        }
        for (int i=0;i<=N;i++)
            for (int j=0;j<=N;j++)
                ans=max(ans,max(dp[0][i][j],dp[1][i][j]));
        return ans;
    }
    return 0;
}

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:5:34: warning: variable 'subt4' set but not used [-Wunused-but-set-variable]
    5 |     bool subt1=1,subt2=1,subt3=1,subt4=(N<=300);
      |                                  ^~~~~

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