Submission #520896

#	Time	Username	Problem	Language	Result	Execution time	Memory
520896		emon_2007	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	710 ms	158832 KiB

joi2019_ho_t1

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
ll h, w, cnt, a[3001][3001], b[3001][3001], k, l;
char c[3001][3001];

int main()
{
    cin >> h >> w;
    for(int i = 1; i <= h; i++)
    {
        for(int j = 1; j <= w; j++)
        {
            cin >> c[i][j];
        }
    }
    for(int j = w; j >= 1; j--)
    {
        for(int i = h; i >= 1; i--)
        {
            if(c[i][j] == 'I')
            {
                k++;
            }
            a[i][j] = k;
        }
        k = 0;
    }
    for(int i = h; i >= 1; i--)
    {
        for(int j = w; j >= 1; j--)
        {
            if(c[i][j] == 'O')
            {
                l++;
            }
            b[i][j] = l;
        }
        l = 0;
    }
    for(int i = 1; i <= h; i++)
    {
        for(int j = 1; j <= w; j++)
        {
            if(c[i][j] == 'J')
            {
                cnt += a[i][j] * b[i][j];
            }
        }
    }
    cout << cnt;
    return 0;
}

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