Submission #724517

#	Time	Username	Problem	Language	Result	Execution time	Memory
724517		TheSahib	Kutije (COCI21_kutije)	C++17	70 / 70	210 ms	13568 KiB

Main

#include <bits/stdc++.h>
 
#pragma GCC optimize("O3")
 
#define ll long long
#define oo 1e9 + 9
#define pii pair<ll, ll>
 
using namespace std;

const int MAX = 1001; 

int n, m, q;
int adj[MAX][MAX];
vector<int> g[MAX];
bitset<MAX> dist[MAX];

bitset<MAX> visited;
void dfs(int node, int p){
    visited[node] = 1;
    dist[p][node] = 1;
    for (int& to:g[node])
    {
        if(!visited[to]){
            if(to < p){
                visited |= dist[to];
                dist[p] |= dist[to];
                continue;
            }
            dfs(to, p);
        }
    }
}


int main(){
    cin >> n >> m >> q;
    for (int i = 0; i < m; i++)
    {
        for (int j = 1; j <= n; j++)
        {
            int a; scanf("%d", &a);
            if(j == a) continue;
            adj[j][a] = 1;
        }
    }
    for (int i = 1; i < MAX; i++)
    {
        for (int j = 1; j < MAX; j++)
        {
            if(adj[i][j]) g[i].push_back(j);
        }
    }
    
    for (int i = 1; i <= n; i++)
    {
        visited.reset();
        dfs(i, i);
    }
    while(q--){
        int a, b; scanf("%d%d", &a, &b);
        if(dist[a][b]){
            cout << "DA\n";
        }
        else{
            cout << "NE\n";
        }
    }
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:42:25: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |             int a; scanf("%d", &a);
      |                    ~~~~~^~~~~~~~~~
Main.cpp:61:24: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   61 |         int a, b; scanf("%d%d", &a, &b);
      |                   ~~~~~^~~~~~~~~~~~~~~~

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