Submission #2518981

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Source Code Expand

#include <bits/stdc++.h>
#define rep(i,n)for(int i=0;i<(n);i++)
using namespace std;

class UnionFind {
	vector<int>par, sz;
public:
	UnionFind() {}
	UnionFind(int n) {
		par = sz = vector<int>(n);
		for (int i = 0; i < n; i++) {
			par[i] = i;
			sz[i] = 1;
		}
	}
	int find(int x) {
		if (par[x] == x)return x;
		return par[x] = find(par[x]);
	}
	void unite(int x, int y) {
		x = find(x); y = find(y);
		if (x == y)return;
		if (sz[x] > sz[y]) {
			par[y] = x;
			sz[x] += sz[y];
		}
		else {
			par[x] = y;
			sz[y] += sz[x];
		}
	}
	bool same(int x, int y) {
		return find(x) == find(y);
	}
	int size(int x) {
		return sz[find(x)];
	}
};
int main(){
	int n,q;scanf("%d%d",&n,&q);
	UnionFind uf(2*n);
	rep(i,q){
		int w,x,y,z;scanf("%d%d%d%d",&w,&x,&y,&z);x--;y--;
		if(w==1){
			if(z%2==0){
				uf.unite(x,y);
				uf.unite(x+n,y+n);
			}
			else{
				uf.unite(x,y+n);
				uf.unite(x+n,y);
			}
		}
		else{
			puts(uf.same(x,y)?"YES":"NO");
		}
	}	
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:40:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  int n,q;scanf("%d%d",&n,&q);
                             ^
./Main.cpp:43:44: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   int w,x,y,z;scanf("%d%d%d%d",&w,&x,&y,&z);x--;y--;
                                            ^

Judge Result