Submission #1122647

#	Time	Username	Problem	Language	Result	Execution time	Memory
1122647		AtabayRajabli	Bitaro the Brave (JOI19_ho_t1)	C++20	100 / 100	309 ms	151400 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
#define all(v) v.begin(), v.end()
#define int long long
using namespace std;

const int sz = 3e3 + 5;
int n, m, orb[sz][sz], ing[sz][sz];
string s[sz];

signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    
    cin >> n >> m;
    for(int i = 0; i < n; i++)
    {
        cin >> s[i];
        for(int j = 0; j < m; j++)
        {
            if(s[i][j] == 'O') orb[i][j] = 1;
            if(s[i][j] == 'I') ing[i][j] = 1;
        }
    }
    for(int i = 0; i < n; i++)
    {
        for(int j = m - 1; j >= 0; j--)
        {
            orb[i][j] += orb[i][j + 1];
        }
    }
    for(int i = 0; i < m; i++)
    {
        for(int j = n - 1; j >= 0; j--)
        {
            ing[j][i] += ing[j + 1][i];
        }
    }
    int ans = 0;
    for(int i = 0; i < n; i++)
    {
        for(int j = 0; j < m; j++)
        {
            if(s[i][j] == 'J') ans += orb[i][j + 1] * ing[i + 1][j];
        }
    }
    cout << ans;
}  

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