Submission #702672

#	Time	Username	Problem	Language	Result	Execution time	Memory
702672		speedyArda	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	363 ms	157944 KiB

joi2019_ho_t1

#include "bits/stdc++.h"

using namespace std;
const int MAXN = 3005;
char board[MAXN][MAXN];
long long pref_orb[MAXN][MAXN];
long long pref_ingot[MAXN][MAXN];
int main() 
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int h, w;
    cin >> h >> w;
    for(int i = 1; i <= h; i++)
    {
        pref_orb[i][0] = 0;
        for(int a = 1; a <= w; a++) {
            cin >> board[i][a];
            pref_orb[i][a] = pref_orb[i][a-1] + (board[i][a] == 'O' ? 1 : 0);
        }
    }
    for(int col = 1; col <= w; col++)
    {
        for(int row = 1; row <= h; row++)
        {
            pref_ingot[row][col] = pref_ingot[row-1][col] + (board[row][col] == 'I' ? 1 : 0);
        }
    }

    long long ans = 0;
    for(int row = 1; row <= h; row++)
    {
        for(int col = 1; col <= w; col++)
        {
            if(board[row][col] == 'J')
            {
                ans += (pref_orb[row][w] - pref_orb[row][col]) * (pref_ingot[h][col] - pref_ingot[row][col]);
            }
            //cout << row << " " << col << " " << ans << "\n";
        }
    }
    cout << ans << "\n";
}

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