Submission #758976

#	Time	Username	Problem	Language	Result	Execution time	Memory
758976		raysh07	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	116 ms	18976 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define INF (int)1e18
#define f first
#define s second

mt19937_64 RNG(chrono::steady_clock::now().time_since_epoch().count());

void Solve() 
{
    int h, w; cin >> h >> w;
    vector<string> s(h);
    vector<int> rs(h, 0);
    vector<int> cs(w, 0);
        
    for (int i = 0; i < h; i++){
        cin >> s[i];
        
        for (int j = 0; j < w; j++){
            if (s[i][j] == 'O') rs[i]++;
            else if (s[i][j] == 'I') cs[j]++;
        }
    }
    
    int ans = 0;
    for (int i = 0; i < h; i++){
        for (int j = 0; j < w; j++){
            if (s[i][j] == 'O') rs[i]--;
            else if (s[i][j] == 'I') cs[j]--;
            else ans += rs[i] * cs[j];
        }
    }
    
    cout << ans << "\n";
}

int32_t main() 
{
    auto begin = std::chrono::high_resolution_clock::now();
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int t = 1;
  //  cin >> t;
    for(int i = 1; i <= t; i++) 
    {
        //cout << "Case #" << i << ": ";
        Solve();
    }
    auto end = std::chrono::high_resolution_clock::now();
    auto elapsed = std::chrono::duration_cast<std::chrono::nanoseconds>(end - begin);
    cerr << "Time measured: " << elapsed.count() * 1e-9 << " seconds.\n"; 
    return 0;
}

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