Submission #386778

#	Time	Username	Problem	Language	Result	Execution time	Memory
386778		cpp219	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	273 ms	159364 KiB

joi2019_ho_t1

#pragma GCC optimization "Ofast"
#pragma GCC optimization "unroll-loop"
#pragma GCC target ("avx2")

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define fs first
#define sc second
using namespace std;
const ll N = 3e3 + 6;
const ll Log2 = 19;
const ll inf = 1e16 + 7;
typedef pair<ll,ll> LL;

ll n,m,cntO[N][N],cntI[N][N];
char a[N][N];
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0), cout.tie(0);
    #define task "tst"
    if (fopen(task".inp", "r")){
        freopen(task".inp", "r", stdin);
        //freopen(task".out", "w", stdout);
    }
    cin>>n>>m;
    for (ll i = 1;i <= n;i++){
        for (ll j = 1;j <= m;j++){
            cin>>a[i][j];
            cntI[i][j] = cntI[i - 1][j] + (a[i][j] == 'I');
            cntO[i][j] = cntO[i][j - 1] + (a[i][j] == 'O');
        }
    }
    ll ans = 0;
    for (ll i = 1;i <= n;i++){
        for (ll j = 1;j <= m;j++) if (a[i][j] == 'J'){
            ll p = cntO[i][m] - cntO[i][j - 1],q = cntI[n][j] - cntI[i - 1][j];
            ans += p*q;
        }
    }
    cout<<ans;
}

Compilation message (stderr)

joi2019_ho_t1.cpp:1: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
    1 | #pragma GCC optimization "Ofast"
      | 
joi2019_ho_t1.cpp:2: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
    2 | #pragma GCC optimization "unroll-loop"
      | 
joi2019_ho_t1.cpp: In function 'int main()':
joi2019_ho_t1.cpp:23:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   23 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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