785. Is Graph Bipartite?

```java
class Solution {
    public boolean isBipartite(int[][] graph) {
        int n = graph.length;
        int[] color = new int[n]; // 0 , 1, -1
        for (int i = 0; i < n; i++) {
            if (color[i] == 0) {
                if (!dfs(graph, color, i, 1)) {
                    return false;
                }
            }
        }
        return true;
    }
    private boolean dfs(int[][] graph, int[] color, int i, int wantedColor) {
        if (color[i] != 0) {
            return color[i] == wantedColor;
        }
        color[i] = wantedColor;
        for (int next : graph[i]) {
            if (!dfs(graph, color, next, wantedColor*(-1))) {
                    return false;
            }
        }
        return true;
    }
}
```