习题8-9(uva-1613)

#include <iostream>
#include <istream>
#include <sstream>
#include <vector>
#include <stack>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <queue>
#include <cstring>
#include <unordered_map>
#include <unordered_set>
#include <algorithm>
#include <numeric>
#include <chrono>
#include <ctime>
#include <cmath>
#include <cctype>
#include <string>
#include <cstdio>
#include <iomanip>


#include <thread>
#include <mutex>
#include <condition_variable>
#include <functional>
#include <iterator>
using namespace std;
const int maxn = 1e4 + 7;
int n, m,k,color[maxn];
vector<int > e[maxn];

bool Check(int cur, int c) {
    
    
	for (int i = 0; i < e[cur].size(); i++) {
    
    
		if (color[e[cur][i]] == c) return false;
	}
	return true;
}
void dfs(int cur) {
    
    
	for (int i = 1; i <= k; i++) {
    
    
		if (Check(cur, i)) {
    
    
			color[cur] = i;
			break;
		}
	}
	for (int i = 0; i < e[cur].size(); i++) {
    
    
		if (!color[e[cur][i]]) {
    
    
			dfs(e[cur][i]);
		}
	}
}

int main()
{
    
    
	int a, b;
	while (cin >> n >> m && n && m) {
    
    
		for (int i = 1; i <= n; i++) e[i].clear();
		k = 0;
		for (int i = 1; i <= m; i++) {
    
    
			cin >> a >> b;
			e[a].push_back(b);
			e[b].push_back(a);
			k = max(k, (int)e[a].size());
			k = max(k, (int)e[b].size());
		}
		k |= 1;
		memset(color, 0, sizeof(color));
		cout << k << endl;
		dfs(1);
		for (int i = 1; i <= n; i++)cout << color[i] << endl;
	}
	return 0;
}

#include <iostream>
#include <istream>
#include <sstream>
#include <vector>
#include <stack>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <queue>
#include <cstring>
#include <unordered_map>
#include <unordered_set>
#include <algorithm>
#include <numeric>
#include <chrono>
#include <ctime>
#include <cmath>
#include <cctype>
#include <string>
#include <cstdio>
#include <iomanip>


#include <thread>
#include <mutex>
#include <condition_variable>
#include <functional>
#include <iterator>
using namespace std;
const int maxn = 1e4 + 7;
int n, m,k,vis[maxn],color[maxn];
vector<int> e[maxn];

void dfs(int cur) {
    
    
	for (int i = 0; i < e[cur].size(); i++) {
    
    
		vis[color[e[cur][i]]] = cur;
	}
	for (int i = 1; i <= k; i++) {
    
    
		if (vis[i] != cur) {
    
    
			color[cur] = i;
			break;
		}
	}
	for (int i = 0; i < e[cur].size(); i++) {
    
    
		if (!color[e[cur][i]]) {
    
    
			dfs(e[cur][i]);
		}
	}
}

int main()
{
    
    
	int a, b;
	while (cin >> n >> m && n && m) {
    
    
		for (int i = 1; i <= n; i++)e[i].clear();
		k = 0;
		for (int i = 1; i <= m; i++) {
    
    
			cin >> a >> b;
			e[a].push_back(b);
			e[b].push_back(a);
		}
		for (int i = 1; i <= n; i++) k = max(k, (int)e[i].size());
		k |= 1;
		memset(vis, 0, sizeof(vis));
		memset(color, 0, sizeof(color));
		dfs(1);
		cout << k << endl;
		for (int i = 1; i <= n; i++) cout << color[i] << endl;
	}
	return 0;
}