Submission #717826

#	Time	Username	Problem	Language	Result	Execution time	Memory
717826		nnin	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	596 ms	72536 KiB

joi2019_ho_t1

#include<bits/stdc++.h>
#define ll long long
#define pii pair<int,int>
#define f first
#define s second
using namespace std;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int H, W;
    cin>>H>>W;
    vector<int> O[H];
    vector<int> I[W];
    vector<pii> J;
    for(int i=0;i<H;i++) {
        string s;
        cin>>s;
        for(int j=0;j<W;j++) {
            if(s[j]=='O') O[i].push_back(j);
            else if(s[j]=='I') I[j].push_back(i);
            else J.push_back({i, j});
        }
    }
    ll ans = 0;
    for(pii j:J) {
        ll o = O[j.f].end()-upper_bound(O[j.f].begin(), O[j.f].end(), j.s);
        ll
         i = I[j.s].end()-upper_bound(I[j.s].begin(), I[j.s].end(), j.f);
        ans += i*o;
    }
    cout<<ans;
}

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