mirror of
https://github.com/Kiritow/OJ-Problems-Source.git
synced 2024-03-22 13:11:29 +08:00
96 lines
2.1 KiB
C++
96 lines
2.1 KiB
C++
#include <iostream>
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#include <cstdio>
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#include <queue>
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#include <cstring>
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#include <string>
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#include <vector>
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using namespace std;
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int n,m;
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struct node
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{
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int x;
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int y;
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char l;
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}a[20005];
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int c[10005];
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int in[10005];
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vector<int> ch[10005];
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queue<int> q;
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void init()
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{
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int i;
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for(i=0;i<n;i++){
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c[i] = i;
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ch[i].clear();
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in[i]=0;
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}
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while(!q.empty()){
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q.pop();
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}
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}
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int find(int x)
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{
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return x == c[x] ? x : c[x] = find(c[x]);
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}
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int main()
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{
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int i,j;
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while(~scanf("%d%d",&n,&m)){
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init();
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int sum = n;
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for(i=0;i<m;i++){
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scanf("%d %c %d",&a[i].x,&a[i].l,&a[i].y);
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if(a[i].l=='='){
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int xx = find(a[i].x);
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int yy = find(a[i].y);
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if(xx!=yy){
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c[xx] = yy;
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}
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sum--;
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}
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}
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int flag = 0;
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for(i=0;i<m;i++){
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if(a[i].l == '=') continue;
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int xx = find(a[i].x);
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int yy = find(a[i].y);
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if(xx==yy) flag=1;
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if(a[i].l == '>'&&!flag){
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ch[xx].push_back(yy);
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in[yy]++;
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}
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else if(a[i].l == '<'&&!flag){
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ch[yy].push_back(xx);
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in[xx]++;
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}
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}
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for(i=0;i<n;i++){
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if(in[i]==0&&find(i)==i){
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q.push(i);
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}
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}
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if(flag==0){
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while(!q.empty()){
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if(q.size()>1)
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flag=2;
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int t = q.front();
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q.pop();
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for(i=0;i<ch[t].size();i++){
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in[ch[t][i]]--;
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if(!in[ch[t][i]])
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q.push(ch[t][i]);
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}
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}
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for(i=0;i<n;i++){
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if(in[i]!=0){
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flag = 1;
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}
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}
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}
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if(!flag) puts("OK");
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else if(flag == 1) puts("CONFLICT");
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else puts("UNCERTAIN");
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}
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return 0;
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}
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