Submission #1074586

#	Time	Username	Problem	Language	Result	Execution time	Memory
1074586		NoLove	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	77 ms	88656 KiB

joi2019_ho_t1

/**
 *    author : Lăng Trọng Đạt
 *    created: 2024-08-25
**/
#include <bits/stdc++.h>
using namespace std;
#ifndef LANG_DAT
#define db(...) ;
#endif // LANG_DAT
#define int long long
#define mp make_pair
#define f first
#define se second
#define pb push_back
#define all(v) (v).begin(), (v).end()
using pii = pair<int, int>;
using vi = vector<int>;
#define FOR(i, a, b) for (int i = a; (i) <= (b); i++)
void mx(int& a, int b) { if (b > a) a = b; }
void mi(int& a, int b) { if (b < a) a = b; }
#define si(x) (int)(x.size())
const int INF = 1e18;
const int MOD = 1e9 + 7;

const int N = 3e3 + 5;
int n, m, k, a, b;

string g[N];
int I_in_col[N][N];

int32_t main() {
    cin.tie(0)->sync_with_stdio(0);
    if (fopen("hi.inp", "r")) {
        freopen("hi.inp", "r", stdin);
//        freopen("hi.out", "w", stdout);
    }

    cin >> n >> m;
    FOR(i, 1, n) {
        cin >> g[i];
        g[i] = '#' + g[i];
        FOR(j, 1, m) {
            I_in_col[i][j] = I_in_col[i - 1][j] + (g[i][j] == 'I');
        }
    }

    int ans = 0;
    FOR(i, 1, n) {
        int cnt = 0;
        FOR(j, 1, m) {
            if (g[i][j] == 'J') cnt += I_in_col[n][j] - I_in_col[i - 1][j];
            if (g[i][j] == 'O') ans += cnt;
            db(i, j, I_in_col[i][j])
        }
    }

    cout << ans;
}

Compilation message (stderr)

joi2019_ho_t1.cpp: In function 'int32_t main()':
joi2019_ho_t1.cpp:34:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   34 |         freopen("hi.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

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