https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&problem=945

C++版本一

/* *@Author: STZG *@Language: C++ */ //#include <bits/stdc++.h> #include<iostream> #include<algorithm> #include<cstdlib> #include<cstring> #include<cstdio> #include<string> #include<vector> #include<bitset> #include<queue> #include<deque> #include<stack> #include<cmath> #include<list> #include<map> #include<set> //#define DEBUG #define RI register int #define endl "\n" using namespace std; typedef long long ll; //typedef __int128 lll; const int N=100000+10; const int M=100000+10; const int MOD=1e9+7; const double PI = acos(-1.0); const double EXP = 1E-8; const int INF = 0x3f3f3f3f; int t,n,m,k,p,l,r,u,v; int ans,cnt,flag,temp,sum; int co[N]; char str; struct node{}; vector<int>G[N]; bool dfs(int u,int c){co[u]=c;for(int i=0,j=G[u].size();i<j;i++){int v=G[u][i];if(co[v]==c)return false;if(co[v]==0&&!dfs(v,-c))return false;}return true; } void init(){memset(co,0,sizeof(co));for(int i=0;i<n;i++)G[i].clear();flag=1; } int main() { #ifdef DEBUGfreopen("input.in", "r", stdin);//freopen("output.out", "w", stdout); #endif//ios::sync_with_stdio(false);//cin.tie(0);//cout.tie(0);//scanf("%d",&t);while(~scanf("%d",&n)&&n){scanf("%d",&m);init();for(int i=1;i<=m;i++){scanf("%d%d",&u,&v);G[u].push_back(v);G[v].push_back(u);}for(int i=0; i<n; ++i) {if(co[i] == 0) {//如果頂點(diǎn)i還沒(méi)被染色，則染成1if(!dfs(i,1)) {flag=0;break;}}}if(flag){printf("BICOLORABLE.\n");}else{printf("NOT BICOLORABLE.\n");}}#ifdef DEBUGprintf("Time cost : %lf s\n",(double)clock()/CLOCKS_PER_SEC); #endif//cout << "Hello world!" << endl;return 0; }

C++版本二

/***********************************************/int co[250];struct node{int v;node(){}node(int _v):v(_v){} }; vector<node>G[250];//鄰接表法 int fff=0;void dfs(int now,int pre) {if(~co[now]){if(co[pre]!=0) co[now]=-co[pre];else co[now]=1;//頭結(jié)點(diǎn)染色//cout<<"co"<<G[now].size()<<endl;for(int i=0;i<G[now].size();i++){if(fff==0 && G[now][i].v!=pre)dfs(G[now][i].v,now);}}else{//染過(guò) if(co[now]==co[pre]){fff=1;}} }int main() {int n,m;while(cin>>n && n){fff=0;mem0(G);cin>>m;for(int i=1;i<=m;i++){int a,b;cin>>a>>b;G[a].push_back(node(b));G[b].push_back(node(a)); }mem0(co);dfs(0,0);//for(int i=0;i<n;i++) cout<<co[i]<<"tt";if(fff){cout<<"NOT BICOLORABLE."<<endl;}else cout<<"BICOLORABLE."<<endl;}return 0; }/* 3 3 0 1 1 2 2 0 3 2 0 1 1 2 9 8 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0*/

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