Submission #1258700

#	Time	Username	Problem	Language	Result	Execution time	Memory
1258700		truongnhattung	Bitaro the Brave (JOI19_ho_t1)	C++20	100 / 100	598 ms	206620 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
#define int long long
using namespace std;
char a[3004][3004];
int sil[3004][3004];
int sir[3004][3004];
int sjl[3004][3004];
int sjr[3004][3004];
 main()
{
    int n,m;
    cin>>n>>m;
    int kq=0;
    vector <pair<int,int>> s;
    for (int i=1;i<=n;i++) {
        for (int j=1;j<=m;j++) {
            cin>>a[i][j];
            if(a[i][j]=='J')s.push_back({i,j});
        }
    }
    for (int i=1;i<=n;i++) {
        for (int j=m;j>=1;j--) {
            sir[i][j]=sir[i][j+1];
            if(a[i][j]=='O') {
                sir[i][j]++;
            }
        }
    }
    for (int i=1;i<=m;i++) {
        for (int j=n;j>=1;j--) {
            sjr[j][i]=sjr[j+1][i];
            if(a[j][i]=='I') {
                sjr[j][i]++;
            }
        }
    }
    for (auto x:s) {
        kq+=sjr[x.first+1][x.second]*sir[x.first][x.second+1];
    }
    cout<<kq;
    return 0;
}

Compilation message (stderr)

joi2019_ho_t1.cpp:9:2: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
    9 |  main()
      |  ^~~~

• Subtask 1: 20 / 20
• Subtask 2: 30 / 30
• Subtask 3: 50 / 50