UVA 193 Graph Coloring
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UVA-193
题意:给出n个点m条边,每条边不允许两端都染色。求最多可以染色多少个点,这些点是哪些。
解题思路:从第一个点开始枚举染或不染,染的条件是它相连的点都未染色。暴力DFS。
/************************************************************************* > File Name: UVA-193.cpp > Author: Narsh > > Created Time: 2016年07月28日 星期四 13时28分29秒 ************************************************************************/#include <iostream>#include <algorithm>#include <cstdio>#include <cstring>using namespace std;bool map[200][200],color[200];int ans,temp[120],n,m,key[120],t;void dfs(int x, int num) { if (x > n) { if (num > ans) { ans = num; for (int i = 1; i <= num; i++) key[i] = temp[i]; } return ; } bool flag = true; for (int i = 1; i <= n; i++) if (map[x][i] && !color[i]) flag =false; if (flag) { temp[num+1] = x; color[x] = false; dfs(x+1,num+1); } color[x] =true; dfs(x+1,num);}int main() { freopen("xx.in","r",stdin); scanf("%d",&t); while (t--) { scanf("%d%d",&n,&m); memset(color,true,sizeof(color)); memset(map,false,sizeof(map)); for (int i = 1; i <= m; i++) { int a,b; scanf("%d%d",&a,&b); map[a][b] = map[b][a] = true; } ans = 0; dfs(1,0); printf("%d\n",ans); for (int i = 1; i < ans; i++) printf("%d ",key[i]); printf("%d\n",key[ans]); }}
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