Submission #434973

#	Time	Username	Problem	Language	Result	Execution time	Memory
434973		ak2006	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	307 ms	88728 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using vb = vector<bool>;
using vvb = vector<vb>;
using vi = vector<int>;
using vvi = vector<vi>;
using vl = vector<ll>;
using vvl = vector<vl>;
using vc = vector<char>;
using vvc = vector<vc>;
using vs = vector<string>;
const ll mod = 1e9 + 7,inf = 1e18;
#define pb push_back
#define fast ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
void setIO()
{
    fast;
}
int main()
{
    setIO();
    int n,m;
    cin>>n>>m;
    vvc g(n,vc(m));
    vvi je(n,vi(m)),o(n,vi(m));
    for (int i = 0;i<n;i++)for (int j = 0;j<m;j++){cin>>g[i][j];
        je[i][j] = (g[i][j] == 'O');
        o[i][j] = (g[i][j] == 'I');
    }
    for (int i = n - 1;i>=0;i--)
        for (int j = m - 1;j>=0;j--)
            je[i][j] += (j != m - 1 ? je[i][j + 1] : 0),
            o[i][j] += (i != n - 1 ? o[i + 1][j] : 0);
    ll ans = 0;
    for (int i = 0;i<n;i++)for (int j = 0;j<m;j++)
        if (g[i][j] == 'J'){
            ans += 1ll * je[i][j] * 1ll * o[i][j];
        }
    cout<<ans;
    return 0;
}

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