Submission #1337838

#TimeUsernameProblemLanguageResultExecution timeMemory
1337838nagorn_phBitaro the Brave (JOI19_ho_t1)C++20
100 / 100
247 ms150524 KiB
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

#define ordered_set <int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update>
#define ordered_multiset <int, null_type, less_equal <int>, rb_tree_tag, tree_order_statistics_node_update>

#define int long long
#define double long double
#define pii pair <int, int>
#define tiii tuple <int, int, int>
#define tiiii tuple <int, int, int, int>
#define emb emplace_back
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define iShowSpeed cin.tie(NULL)->sync_with_stdio(false)
#define matrix vector <vector <int>>
#define mat(n, m) vector <vector <int>> (n, vector <int> (m));

const int mod = 1e9 + 7;
const int inf = 1e18;
const matrix II = {{1, 0}, {0, 1}};

void solve(){
    int n, m; cin >> n >> m;
    string s[n + 1]; for (int i = 1; i <= n; i++) cin >> s[i], s[i] = ' ' + s[i];
    int orb[n + 2][m + 2], ingot[n + 2][m + 2];
    for (int i = 1; i <= n; i++) {
        orb[i][m + 1] = 0;
        for (int j = m; j >= 1; j--) orb[i][j] = orb[i][j + 1] + (s[i][j] == 'O');
    }
    for (int i = 1; i <= m; i++) {
        ingot[n + 1][i] = 0;
        for (int j = n; j >= 1; j--) ingot[j][i] = ingot[j + 1][i] + (s[j][i] == 'I');
    }
    int ans = 0;
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= m; j++) {
            if (s[i][j] == 'J') ans += orb[i][j + 1] * ingot[i + 1][j];
        }
    }
    cout << ans;
}

int32_t main(){
    iShowSpeed;
    // int q; cin >> q; while (q--) 
    solve();
}
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