769. Max Chunks To Make Sorted

class Solution {
public:
    int maxChunksToSorted(vector<int>& arr) {
        if (arr.size() == 1)
            return 1;
        int max = -1;
        int cnt = 0;
        
        for (int i = 0; i < arr.size(); i++) {
            if (max == -1) {
                max = arr[i];
            }
            if (arr[i] > max)
                max = arr[i];
            if (i == max) {
                cnt++;
                max = arr[i + 1];
            }
            //cout << i << "," << max << endl;
        }   
        return cnt;
    }
};