Submission #777088

#	Time	Username	Problem	Language	Result	Execution time	Memory
777088		teokakabadze	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	201 ms	159000 KiB

joi2019_ho_t1

#include<bits/stdc++.h>
#define f first
#define s second
#define pb push_back
#define int long long
#define N 200005
#define pii pair<int, int>
#define piii pair<int, pii>
using namespace std;

int n, m, i, j, d[3003][3003], r[3003][3003], ans;
char a[3003][3003];

main()
{
    std::ios::sync_with_stdio(0);
    cin.tie(0);
    
    cin >> n >> m;
    for(i = 0; i < n; i++)
    for(j = 0; j < m; j++)
    cin >> a[i][j];
    for(i = n - 1; i >= 0; i--)
    for(j = m - 1; j >= 0; j--)
    {
        if(j == m - 1) r[i][j] = 0;
        else if(a[i][j + 1] == 'O') r[i][j] = r[i][j + 1] + 1;
        else r[i][j] = r[i][j + 1];
        
        if(i == n - 1) d[i][j] = 0;
        else if(a[i + 1][j] == 'I') d[i][j] = d[i + 1][j] + 1;
        else d[i][j] = d[i + 1][j];
        
        if(a[i][j] == 'J') ans += r[i][j] * d[i][j];
    }
    cout << ans << '\n';
}

Compilation message (stderr)

joi2019_ho_t1.cpp:14:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   14 | main()
      | ^~~~

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