Submission #839701

#	Time	Username	Problem	Language	Result	Execution time	Memory
839701		ipslp	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	231 ms	53240 KiB

joi2019_ho_t1

#include <iostream>
using namespace std;
int n, m;
const int max_dim = 3*1e3 + 5;
char v[max_dim][max_dim];
int s[max_dim][max_dim];
int main()
{
    ios_base::sync_with_stdio(false);cin.tie(nullptr);cout.tie(nullptr);
    cin >> n >> m;
    for( int i = 1; i <= n; ++i )
    {
        for( int j = 1; j <= m; ++j )
        {
            cin >> v[i][j];
        }
    }
    for( int i = 1; i <= n; ++i )
    {
        int O = 0;
        for( int j = m; j >= 1; --j )
        {
            if( v[i][j] == 'O' )
                ++O;
            if( v[i][j] == 'J' )
            {
                s[i][j] = O;
            }
        }
    }
    long long cnt = 0;
    for( int j = 1; j <= m; ++j )
    {
        int J = 0;
        for( int i = 1; i <= n; ++i )
        {
            if( v[i][j] == 'J' )
                J+=s[i][j];
            if( v[i][j] == 'I' )
            {
                //++I;
                //cout << 1 << " " << J << "\n";
                cnt += J;
            }
        }
    }
    cout << cnt;
    return 0;
}

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