Submission #974062

#	Time	Username	Problem	Language	Result	Execution time	Memory
974062		VinhLuu	Kutije (COCI21_kutije)	C++17	70 / 70	140 ms	9812 KiB

Main

//#pragma GCC optimize("O3,unroll-loops")
//#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#include <bits/stdc++.h>
#define int long long
#define ll long long
#define fi first
#define se second
#define pb push_back
#define all(lmao) lmao.begin(), lmao.end()

using namespace std;

typedef pair<int,int> pii;
typedef tuple<int,int,int> tp;
const int N = 1e5 + 5;
const int oo = 1e9 + 1;
const int mod = 1e9 + 7;
//const ll oo = 5e18;

int n, pa[N], sz[N], m, q;

int fin(int u){
    return pa[u] == u ? u : pa[u] = fin(pa[u]);
}

void dsu(int x,int y){
    x = fin(x), y = fin(y);
    if(sz[x] < sz[y]) swap(x, y);
    pa[y] = x, sz[x] += sz[y];
}

signed main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    #define task "v"
    if(fopen(task ".inp","r")){
        freopen(task ".inp","r",stdin);
        freopen(task ".out","w",stdout);
    }

    cin >> n >> m >> q;

    for(int i = 1; i <= n; i ++) pa[i] = i, sz[i] = 1;

    while(m--){
        for(int i = 1; i <= n; i++){
            int x; cin >> x;
            dsu(i, x);
        }
    }

    while(q--){
        int x, y; cin >> x >> y;
        cout << (fin(x) == fin(y) ? "DA" : "NE") << "\n";
    }
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:37:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |         freopen(task ".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:38:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |         freopen(task ".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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