Submission #880571

#	Time	Username	Problem	Language	Result	Execution time	Memory
880571		boris_7	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	495 ms	59652 KiB

joi2019_ho_t1

#include<bits/stdc++.h>

using namespace std;
using ll = long long;


void solve(){
    int n,m;
    cin>>n>>m;
    vector<string>v(n);
    for(string &i:v){
        cin>>i;
    }
    vector<vector<int>>a(n);
    vector<vector<int>>b(m);
    for(int i = 0;i<n;i++){
        for(int j = 0;j<m;j++){
            if(v[i][j]=='O'){
                a[i].push_back(j);
            }
            if(v[i][j]=='I'){
                b[j].push_back(i);
            }
        }
    }
    ll ans = 0;
    for(int i = 0;i<n;i++){
        for(int j= 0;j<m;j++){
            if(v[i][j]=='J'){
                ll c = a[i].end()-upper_bound(a[i].begin(),a[i].end(),j);
                ll d = b[j].end()-upper_bound(b[j].begin(),b[j].end(),i);
                ans+=c*d;
            }
        }
    }
    cout<<ans<<endl;
}

signed main(){
    ios_base::sync_with_stdio(0);
    cin.tie(nullptr);
    // ll t;cin>>t;while(t--)
        solve();
}

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