Submission #97438

#	Time	Username	Problem	Language	Result	Execution time	Memory
97438		polyfish	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	503 ms	79836 KiB

joi2019_ho_t1

//Pantyhose(black) + glasses = infinity

#include <bits/stdc++.h>
using namespace std;
 
#define debug(x) cerr << #x << " = " << x << '\n';
#define BP() cerr << "OK!\n";
#define PR(A, n) {cerr << #A << " = "; for (int _=1; _<=n; ++_) cerr << A[_] << ' '; cerr << '\n';}
#define PR0(A, n) {cerr << #A << " = "; for (int _=0; _<n; ++_) cerr << A[_] << ' '; cerr << '\n';}
#define FILE_NAME "data"

const int MAX_N = 3002;

int m, n;
char a[MAX_N][MAX_N];
int row[MAX_N][MAX_N], col[MAX_N][MAX_N];

void readInput() {
	cin >> m >> n;
	for (int i=1; i<=m; ++i) {
		for (int j=1; j<=n; ++j)
			cin >> a[i][j];
	}
}

void solve() {
	for (int i=1; i<=m; ++i) {
		for (int j=n; j>=1; --j)
			row[i][j] = row[i][j+1] + (a[i][j]=='O');
	}

	for (int j=1; j<=n; ++j) {
		for (int i=m; i>=1; --i)
			col[i][j] = col[i+1][j] + (a[i][j]=='I');
	}

	int64_t res = 0;

	for (int i=1; i<=m; ++i) {
		for (int j=1; j<=n; ++j) {
			if (a[i][j]=='J')
				res += row[i][j] * col[i][j];
		}
	}

	cout << res;
}

int main() {
	#ifdef GLASSES_GIRL
		freopen(FILE_NAME".in", "r", stdin);
		freopen(FILE_NAME".out", "w", stdout);
	#endif
	ios::sync_with_stdio(0); cin.tie(0);
	readInput();
	solve();
}

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