제출 #1224926

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1224926		LeonidCuk	메기 농장 (IOI22_fish)	C++20	컴파일 에러	0 ms	0 KiB

fish

#include <bits/stdc++.h>
#include "fish.h"
using namespace std;
int n,m;
long long max_weights(int N, int M, vector<int> X,vector<int>Y,vector<int>W)
{
    n=N;m=M;
    vector<long long>pref1(n+1),suf1(n+1),suf2(n+1),pref2(n+1);
    vector<vector<long long>>pref(n+1,vector<long long>(n+1));
    vector<vector<vector<long long>>>dp(n,vector<vector<long long>>(n+1,vector<long long>(2)));
    for(int i=0;i<m;i++)
    {
        pref[X[i]][Y[i]+1]+=W[i];
    }
    for(int i=0;i<n;i++)
    {
        for(int j=1;j<=n;j++)
        {
            pref[i][j]+=pref[i][j-1];
        }
    }
    for(int i=1;i<n;i++)
    {
        for(int j=0;j<=n;j++)
        {
                dp[i][j][0]=max(dp[i][j][0],pref1[max(0,j-1)]+pref[i-1][j]);
                dp[i][j][1]=max(dp[i][j][1],suf1[j]-pref[i][j]);
                dp[i][j][0]=max(dp[i][j][0],max(suf2[j],pref2[j]+pref[i-1][j]));
                dp[i][j][1]=max(dp[i][j][1],max(suf2[j],pref2[j]+pref[i-1][j]));
        }
        if(i==n-1)continue;
        pref1[0]=dp[i][0][0]-pref[i][0];
        pref2[0]=max(dp[i-1][0][0],dp[i-1][0][1]);
        for(int j=1;j<=n;j++)
        {
            pref1[j]=max(pref1[j-1],dp[i][j][0]-pref[i][j]);
            pref2[j]=max(pref2[j-1],max(dp[i-1][j][0],dp[i-1][j][1]));
        }
        suf1[n]=max(dp[i][n][0],dp[i][n][1])+pref[i+1][n];
        suf2[n]=max(dp[i-1][n][0],dp[i-1][n][1])+pref[i][n];
        for(int j=n-1;j>=0;j--)
        {
            suf1[j]=max(suf1[j+1],max(dp[i][j][0],dp[i][j][1])+pref[i+1][j]);
            suf2[j]=max(suf2[j+1],max(dp[i-1][j][0],dp[i-1][j][1])+pref[i][j]);
        }
    }
    long long res=0;
    for(int i=0;i<=n;i++)
    {
        res=max(res,dp[n-1][i][0]);
        res=max(res,dp[n-1][i][1]);
    }
    ret

컴파일 시 표준 에러 (stderr) 메시지

fish.cpp: In function 'long long int max_weights(int, int, std::vector<int>, std::vector<int>, std::vector<int>)':
fish.cpp:53:5: error: 'ret' was not declared in this scope; did you mean 'res'?
   53 |     ret
      |     ^~~
      |     res
fish.cpp:53:8: error: expected '}' at end of input
   53 |     ret
      |        ^
fish.cpp:6:1: note: to match this '{'
    6 | {
      | ^
fish.cpp:53:8: warning: no return statement in function returning non-void [-Wreturn-type]
   53 |     ret
      |        ^