Friday, 20 February 2026

Biprariate Graph check correct approach soln (DFS)leetcode accepted (BEATS 100%)

 class Solution {

public:
    void DFS(int node,vector<vector<int>>&adj,vector<int>&colors,int cc){
        colors[node]=cc;
        for(int x:adj[node]){
            if(!colors[x])DFS(x,adj,colors,(cc==2)?1:2);
        }
    }
    bool isBipartite(vector<vector<int>>& graph) {
        int n =graph.size();
        vector<int>colors(n,0);
        for(int i =0;i<n;i++){
            if(!colors[i])DFS(i,graph,colors,2);
        }
        for(int i=0;i<n;i++){
            for(int x:graph[i]){
                if(colors[i]==colors[x])return false;
            }
        }
        return true;
    }
};

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