Submission #420209

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Source Code Expand

#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <cmath>
#include <ctime>
#include <cassert>
#include <string>
#include <algorithm>
#include <vector>
#include <queue>
#include <stack>
#include <functional>
#include <iostream>
#include <map>
#include <set>
#include <cassert>
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> P;
typedef pair<int,P> P1;
typedef pair<P,P> P2;
#define pu push
#define pb push_back
#define mp make_pair
#define eps 1e-7
#define INF 1000000000
#define fi first
#define sc second
#define rep(i,x) for(int i=0;i<x;i++)
#define SORT(x) sort(x.begin(),x.end())
#define ERASE(x) x.erase(unique(x.begin(),x.end()),x.end())
#define POSL(x,v) (lower_bound(x.begin(),x.end(),v)-x.begin())
#define POSU(x,v) (upper_bound(x.begin(),x.end(),v)-x.begin())
int par[100050],ran[100050];
void init(){ for(int i=0;i<100050;i++) par[i] = i; }
int find(int x){ if(x == par[x]) return x; else return par[x] = find(par[x]); }
void unite(int x,int y){
	x = find(x); y = find(y); if(x==y) return;
	if(ran[x] < ran[y]) par[x] = y;
	else{
		par[y] = x;
		if(ran[x] == ran[y]) ran[x]++;
	}
}
bool same(int x,int y){ return find(x)==find(y); }
int h,w;
int main()
{
	cin >> h >> w;
	init();
	for(int i=0;i<w;i++)
	{
		int q;  scanf("%d",&q);
		if(q==0)
		{
			int a,b; scanf("%d%d",&a,&b);
			unite(a,b);
		}
		else
		{
			int a,b; scanf("%d%d",&a,&b);
			cout << (same(a,b)?"Yes":"No") << endl;
		}
	}
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:54:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   int q;  scanf("%d",&q);
                         ^
./Main.cpp:57:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
    int a,b; scanf("%d%d",&a,&b);
                                ^
./Main.cpp:62:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
    int a,b; scanf("%d%d",&a,&b);
                                ^

Judge Result