GraphDS/BipartiteCheckII.cpp at main · vivekko/GraphDS · GitHub

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#include <bits/stdc++.h>
using namespace std;
void __print(int x) {cerr << x;}
void __print(long x) {cerr << x;}
void __print(long long x) {cerr << x;}
void __print(unsigned x) {cerr << x;}
void __print(unsigned long x) {cerr << x;}
void __print(unsigned long long x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '\"' << x << '\"';}
void __print(const string &x) {cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");}
#define NFS(nitro) ios_base::sync_with_stdio(false);cin.tie(0);
template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#ifndef ONLINE_JUDGE
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
#define debug(x...)
#endif
#define int long long
#define vivek main
#define all(x) (x).begin(),(x).end()
#define vec_p vector<pair<int,int>
#define v vector<int>
bool dfs(int node,v adj[],v &colour,int n){
    if(colour[node] == -1)  colour[node] = 1;
    for(auto i:adj[node]){
        if(colour[i] == -1){
            colour[i] = 1 - colour[node];
            if(!dfs(i,adj,colour,n)) return false;
        }
        else if(colour[i] == colour[node])  return false;
    }
    return true;
}


void checkBipartite(v adj[],int n){
    v colour(n+1,-1);
    for(int i=1;i<=n;i++){
        if(!colour[i]){
            if(!dfs(i,adj,colour,n))    {cout<<"false"; return;}
        }
    }
}


void solve(){
    int m,n;cin>>m>>n;
    v adj[n+1];
    for(int i=0;i<n;i++){
        int x,y;cin>>x>>y;
        adj[x].push_back(y);
        adj[y].push_back(x);
    }
    checkBipartite(adj,n);

}
int32_t vivek(){
NFS(NITRO);
int t;
cin>>t;
while(t-->0)
    solve();
return 0;
}

// ___.   .__                 __          .__              __
// \_ |__ |  | _____    ____ |  | _____  _|__|__  __ ____ |  | __
//  | __ \|  | \__  \ _/ ___\|  |/ /\  \/ /  \  \/ // __ \|  |/ /
//  | \_\ \  |__/ __ \   \___|    <  \   /|  |\   /\  ___/|    <
//  |___  /____(____  /\___  >__|_ \  \_/ |__| \_/  \___  >__|_ \
//      \/          \/     \/     \/                    \/     \/