Submission #1254471

#	Time	Username	Problem	Language	Result	Execution time	Memory
1254471		hoa208	Bitaro the Brave (JOI19_ho_t1)	C++20	50 / 100	230 ms	339968 KiB

joi2019_ho_t1

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define FOR(i, a, b) for (int i = (a), _b = (b); i <= _b; i++)
#define FORD(i, b, a) for (int i = (b), _a = (a); i >= _a; i--)
#define pa pair<ll, ll>
#define fi first
#define se second
#define bit(mask, j) ((mask >> j) & 1)
#define t_test int t;cin >> t;while(t--)
const   ll mod = 1e9 + 7;
const   ll INF = 1e18;
inline  void adm(ll &x){if(x>=mod)x%=mod;else if(x<0)x+=mod;}
//--------------------------------------------------------------------

string T = "JOI";
ll n, m;
const ll N = 5003;
ll s[N][N][4], c[N][N];
ll get(ll u, ll v, ll x, ll y, ll t) {
    return s[x][y][t] - s[u - 1][y][t] - s[x][v - 1][t] + s[u - 1][v - 1][t];
}
void hbmt() {
    cin >> n >> m;
    FOR(i, 1, n) {
        FOR(j, 1, m) {
            char x;
            cin >> x;
            ll e = T.find(x);
            c[i][j] = e;
            FOR(u, 0, 2) {
                s[i][j][u] = s[i - 1][j][u] + s[i][j - 1][u] - s[i - 1][j - 1][u] + (e == u);
            }
        }
    }
    ll ans = 0;
    FOR(i, 1, n) {
        FOR(j, 1, m) {
            if(c[i][j] == 0) {
                ans += 1LL * get(i, j, i, m, 1) * get(i, j, n, j, 2);
            }
        }
    }
    cout << ans;
}

int main() {
    
    ios_base::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    
    if(fopen("hbmt.inp", "r")) {
        freopen("hbmt.inp", "r", stdin);
        freopen("hbmt.out", "w", stdout);
    }
    
    // t_test 
    hbmt();
    return 0;
}

Compilation message (stderr)

joi2019_ho_t1.cpp: In function 'int main()':
joi2019_ho_t1.cpp:53:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   53 |         freopen("hbmt.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
joi2019_ho_t1.cpp:54:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   54 |         freopen("hbmt.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 30 / 30
• Subtask 3: 0 / 50