Submission #1258703

#	Time	Username	Problem	Language	Result	Execution time	Memory
1258703		tminh	Bitaro the Brave (JOI19_ho_t1)	C++20	100 / 100	473 ms	54040 KiB

joi2019_ho_t1

#include "bits/stdc++.h"
using namespace std;

#define task ""
#define ll long long
#define endl '\n'
#define fi first
#define se second
#define vall(a) (a).begin(), (a).end()
#define sze(a) (int)a.size()
#define pii pair<int, int>
#define pll pair<ll, ll>


#define ep emplace_back
#define pb push_back
#define pf push_front


const ll mod = 1e9 + 7;
const int N = 3005;
const ll oo = 1e18;

bool START;


int n, m;
char a[N][N];
vector<int> r[N], c[N];

inline void solve() {
	for (int i = 1; i <= n; ++i) {
		for (int j = 1; j <= m; ++j) {
			if (a[i][j] == 'I') c[j].pb(i);
			if (a[i][j] == 'O') r[i].pb(j);
		}
	}
	
	ll ans = 0;
	for (int i = 1; i <= n; ++i) {
		for (int j = 1; j <= m; ++j) {
			if (a[i][j] == 'J') {
				int val1 = sze(r[i]) - (lower_bound(vall(r[i]), j) - r[i].begin());
				int val2 = sze(c[j]) - (lower_bound(vall(c[j]), i) - c[j].begin());
				ans += val1 * val2;
			}
		}
	}
	cout << ans;
	
}


inline void input() {
    cin >> n >> m;
    for (int i = 1; i <= n; ++i) {
    	for (int j = 1; j <= m; ++j) cin >> a[i][j];
    }
    return solve();
}
bool END;

int main() {
    if(fopen(task ".inp", "r")) {
        freopen(task ".inp", "r", stdin);
        freopen(task ".out", "w", stdout);
    }
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr); cout.tie(nullptr);

    input();
    
    
    cerr << endl << "Time elapsed: " << 1.0 * clock() / CLOCKS_PER_SEC << 's' << endl;
    cerr << "Memory: " << fabs ((&END - &START)) / 1048576.0 << "MB\n";
    return 0;
}

Compilation message (stderr)

joi2019_ho_t1.cpp: In function 'int main()':
joi2019_ho_t1.cpp:65:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |         freopen(task ".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
joi2019_ho_t1.cpp:66:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   66 |         freopen(task ".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

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