Ant Trip
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 1567 Accepted Submission(s): 609
Ant Tony,together with his friends,wants to go through every part of the country.
They intend to visit every road , and every road must be visited for exact one time.However,it may be a mission impossible for only one group of people.So they are trying to divide all the people into several groups,and each may start at different town.Now tony wants to know what is the least groups of ants that needs to form to achieve their goal.
//
// main.cpp
// HDU 3018 歐拉回路
//
// Created by 鄭喆君 on 8/8/14.
// Copyright (c) 2014 itcast. All rights reserved.
//
#include<cstdio>
#include<cstring>
#include<iostream>
#include<iomanip>
#include<queue>
#include<cmath>
#include<stack>
#include<map>
#include<vector>
#include<set>
#include<algorithm>
using namespace std;
typedef long long LL;
const int int_max = 0x07777777;
const int int_min = 0x80000000;
const int maxn = 110000;
int root[maxn];
int find (int x){
while(x!=root[x]){
x = root[x];
}
return x;
}
void combine (int x, int y){
int xx = find(x);
int yy = find(y);
if(xx!=yy){
root[yy] = xx;
}
}
vector<int> g[maxn];
vector<int> gg[maxn];
int n,m;
int main(int argc, const char * argv[])
{
while(scanf("%d %d", &n, &m)!=EOF){
for(int i = 0; i < maxn; i++) {
g[i].clear();
gg[i].clear();
root[i] = i;
}
for(int i = 0; i < m; i++){
int x, y;
scanf("%d %d", &x, &y);
g[x].push_back(y);
g[y].push_back(x);
combine(x, y);
}
int result = 0;
for(int i = 1; i <= n; i++){
if(g[i].size()&1) result++;
}
result /= 2;
for(int i = 1; i <= n; i++){
gg[find(i)].push_back(i);
}
for(int i = 1; i<= n; i++){
if(gg[i].size()){
int flag = 1;
for(int j = 0; j < gg[i].size(); j++){
if(g[gg[i][j]].size()&1 || g[gg[i][j]].size()==0) {
flag = 0;
break;
}
}
if(flag) result++;
}
}
cout << result << endl;
}
}