Submission #1437732

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Source Code Expand

#include<algorithm>
#include<bitset>
#include<cassert>
#include<cctype>
#include<cerrno>
#include<cfloat>
#include<ciso646>
#include<climits>
#include<clocale>
#include<cmath>
#include<complex>
#include<csetjmp>
#include<csignal>
#include<cstdarg>
#include<cstddef>
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<ctime>
#include<ctype.h>
#include<cwchar>
#include<cwctype>
#include<deque>
#include<exception>
#include<fstream>
#include<functional>
#include<iomanip>
#include<ios>
#include<iosfwd>
#include<iostream>
#include<istream>
#include<iterator>
#include<limits>
#include<list>
#include<locale>
#include<map>
#include<math.h>
#include<memory>
#include<new>
#include<numeric>
#include<ostream>
#include<queue>
#include<set>
#include<sstream>
#include<stack>
#include<stdexcept>
#include<stdio.h>
#include<stdlib.h>
#include<streambuf>
#include<string.h>
#include<string>
#include<typeinfo>
#include<utility>
#include<valarray>
#include<vector>
using namespace std;
vector<int> adj[100010];
int dist[100010];
int mxid;
void dfs(int fa,int i){
	for (int j=adj[i].size()-1;~j;j--){
		if (adj[i][j]!=fa){
			dist[adj[i][j]]=dist[i]+1;
			if (dist[i]+1>dist[mxid]) mxid=adj[i][j];
			dfs(i,adj[i][j]);
		}
	}
}
int main(void){
	int n;
	scanf("%d",&n);
	for (int i=1;i<n;i++){
		int a,b;
		scanf("%d%d",&a,&b);
		adj[a].push_back(b);
		adj[b].push_back(a);
	}
	dfs(-1,1);
	memset(dist,0,sizeof(dist));
	dfs(-1,mxid);
	int i=1,j=2;
	while(j<dist[mxid]){
		i++;
		j++;
		j<<=1;
	}
	printf("%d",i);
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:71:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
                ^
./Main.cpp:74:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",&a,&b);
                      ^

Judge Result