Submission #851841

#	Time	Username	Problem	Language	Result	Execution time	Memory
851841		vjudge1	Kutije (COCI21_kutije)	C++17	0 / 70	227 ms	20916 KiB

Main

#include <bits/stdc++.h>
using namespace std;

#pragma GCC optimize("Ofast,O3,unroll-loops")
#define int long long
#define vi vector<int>
#define vvi vector<vi>
#define pii pair<int, int>
#define vpi vector<pii>
#define vvpi vector<vpi>
#define vb vector<bool>
#define vvb vector<vb>
#define endl "\n"
#define sp << " " <<
#define F(i, s, n) for(int i = s; i < n; i++)
#define pb push_back
#define fi first
#define se second

int inf = LLONG_MAX >> 3;

vvi adj(1001);
vb visited(1001, false);
vi tout(1001);
vector<set<int>> can(1001);
int x, y;
bool ans = false;
int t = 0;

void dfs(int node) {
    if(visited[node]) return;
    visited[node] = true;
    for(int nei: adj[node]) dfs(nei);
    tout[node] = t++;
}
void solve() {
    int n, m, q;
    cin >> n >> m >> q;
    F(i, 0, m) {
        F(j, 0, n) {
            int x;
            cin >> x;
            x--;
            adj[x].pb(j);
        }
    }
    F(i, 0, n) {
        can[i].insert(i);
        dfs(i);
    }
    vi ord(n);
    F(i, 0, n) ord[i] = i;
    sort(ord.begin(), ord.end(), [](int a, int b) {return tout[a] < tout[b];});
    F(i, 0, n) {
        int cur = ord[i];
        for(int nei: adj[cur]) {
            for(int go: can[nei]) can[cur].insert(go);
        }
    }
    F(i, 0, q) {
        int x, y;
        cin >> x >> y;
        x--, y--;
        if(can[x].count(y)) cout << "DA" << endl;
        else cout << "NE" << endl;
    }
}
void setIO() {
    ios::sync_with_stdio(0); cin.tie(0);
    #ifdef Local
        freopen("in.txt", "r", stdin);
        freopen("out.txt", "w", stdout);
    #endif
}
signed main() {
    setIO();
    solve();
}

• Subtask 1: 0 / 15
• Subtask 2: 0 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 35