Submission #142667

#	Time	Username	Problem	Language	Result	Execution time	Memory
142667		DrumpfTheGodEmperor	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	420 ms	88568 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
#define bp __builtin_popcountll
#define pb push_back
#define in(s) freopen(s, "r", stdin);
#define out(s) freopen(s, "w", stdout);
#define inout(s, end1, end2) freopen((string(s) + "." + end1).c_str(), "r", stdin),\
		freopen((string(s) + "." + end2).c_str(), "w", stdout);
#define fi first
#define se second
#define bw(i, r, l) for (int i = r - 1; i >= l; i--)
#define fw(i, l, r) for (int i = l; i < r; i++)
#define fa(i, x) for (auto i: x)
using namespace std;
const int mod = 1e9 + 7, inf = 1061109567;
const long long infll = 4557430888798830399;
const int N = 3005;
int n, m, cnti[N], cntRight[N][N], cntDown[N][N];
char a[N][N];
signed main() {
	#ifdef BLU
	in("blu.inp");
	#endif
	ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
	cin >> n >> m;
	fw (i, 0, n) fw (j, 0, m) cin >> a[i][j];
	fw (i, 0, n) fw (j, 0, m) {
		if (a[i][j] == 'I') cnti[j]++;
	}
	fw (i, 0, n) {
		int rowCntO = 0;
		fw (j, 0, m) {
			if (a[i][j] == 'O') rowCntO++;
		}
		fw (j, 0, m) {
			if (a[i][j] == 'O') rowCntO--;
			else if (a[i][j] == 'J') {
				cntRight[i][j] = rowCntO;
			}
		}
		fw (j, 0, m) {
			if (a[i][j] == 'I') cnti[j]--;
			if (a[i][j] == 'J') cntDown[i][j] = cnti[j];
		}
	}
	long long ans = 0;
	fw (i, 0, n) {
		fw (j, 0, m) {
			if (a[i][j] == 'J') ans += 1ll * cntDown[i][j] * cntRight[i][j];
		}
	}
	cout << ans;
	return 0;
}

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