Submission #1082621

#	Time	Username	Problem	Language	Result	Execution time	Memory
1082621		lamlamlam	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	257 ms	159216 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define endl '\n'
const int MN = 3005;
int n,m,cnt_o[MN][MN],cnt_i[MN][MN];
char a[MN][MN];

signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    #define task "sus"
    if(fopen(task".inp","r")){
        freopen(task".inp","r",stdin);
        freopen(task".out","w",stdout);
    }
    cin >> n >> m;
    for(int i=1; i<=n; i++){
        for(int j=1; j<=m; j++){
            cin >> a[i][j];
            if(a[i][j]=='O') cnt_o[i][j]++;
            if(a[i][j]=='I') cnt_i[i][j]++;
        }
    }
    for(int i=1; i<=n; i++){
        for(int j=1; j<=m; j++){
            cnt_o[i][j] += cnt_o[i][j-1];
            cnt_i[i][j] += cnt_i[i-1][j];
        }
    }
    int ans = 0;
    for(int i=1; i<=n; i++) for(int j=1; j<=m; j++) if(a[i][j]=='J')
        ans += (cnt_o[i][m]-cnt_o[i][j])*(cnt_i[n][j]-cnt_i[i][j]);
    cout << ans;
    cerr << "\nTime: " << clock();
}

Compilation message (stderr)

joi2019_ho_t1.cpp: In function 'int main()':
joi2019_ho_t1.cpp:15:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |         freopen(task".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
joi2019_ho_t1.cpp:16:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |         freopen(task".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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