Submission #955158

#	Time	Username	Problem	Language	Result	Execution time	Memory
955158		hoanganh_siuuuuuuuu	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	305 ms	220824 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
#define int long long
#define f(i, a, b) for(int i = a; i <= b; i++)
#define fr(i, a, b) for(int i = a; i >= b; i--)
#define pii pair <int, int>
#define fi first
#define se second
#define pb push_back
#define eb emplace_back
#define in insert
#define vvec vector<vector<int>>
#define fast ios_base :: sync_with_stdio(0); cin.tie(0); cout.tie(0)

using namespace std;

const int N = 3003;
int n, m, cnt[N][N], cnt2[N][N], a[N][N];

signed main()
{
    fast;
    cin >> n >> m;
    f(i, 1, n)
        f(j, 1, m)
        {
            char kt; cin >> kt;
            if(kt == 'J') a[i][j] = 1;
            else if(kt == 'O') a[i][j] = 2;
            else a[i][j] = 3;
        }

    f(i, 1, n)
        fr(j, m, 1) cnt[i][j] = (a[i][j] == 2) + cnt[i][j + 1];

    fr(i, n, 1)
        f(j, 1, m) cnt2[i][j] = (a[i][j] == 3) + cnt2[i + 1][j];

    int res = 0;
    f(i, 1, n)
        f(j, 1, m)
            if(a[i][j] == 1) res += cnt[i][j] * cnt2[i][j];

    cout << res;
}

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