Submission #1102509

#	Time	Username	Problem	Language	Result	Execution time	Memory
1102509		EkinOnal	Kutije (COCI21_kutije)	C++17	70 / 70	179 ms	1864 KiB

Main

//#pragma GCC optimize("O3,unroll-loops,Ofast")
//#pragma GCC target("avx2,bmi,bmi2,popcnt,lzcnt")
#include <bits/stdc++.h>
using namespace std;

struct DSU {
	vector<int> e; void init(int N) { e = vector<int>(N,-1);}
	int get(int x) { return e[x] < 0 ? x : e[x] = get(e[x]); } 
	bool sameSet(int a, int b) { return get(a) == get(b); }
	int size(int x) { return -e[get(x)]; }
	bool unite(int x, int y) { // union by size
		x = get(x), y = get(y); if (x == y) return 0;
		if (e[x] > e[y]) swap(x,y);
		e[x] += e[y]; e[y] = x;  return 1;
	}
};

DSU t;
int n,m,q,a,b;
int32_t main(){
	ios_base::sync_with_stdio(0); cin.tie(0);		
	scanf("%d %d %d",&n,&m,&q);

	t.init(n+2);
	for(int i=1;i<=m;i++){
		for(int j=1;j<=n;j++){
			scanf("%d",&a); 
			t.unite(j,a);
		}
	}
	while(q--){
		scanf("%d %d",&a,&b);
		if(t.sameSet(a,b)) printf("DA\n");
		else printf("NE\n");
	}
 		
	return 0;	 			
}

Compilation message (stderr)

Main.cpp: In function 'int32_t main()':
Main.cpp:22:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |  scanf("%d %d %d",&n,&m,&q);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~
Main.cpp:27:9: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |    scanf("%d",&a);
      |    ~~~~~^~~~~~~~~
Main.cpp:32:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |   scanf("%d %d",&a,&b);
      |   ~~~~~^~~~~~~~~~~~~~~

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