Leetcode457

A very absurd description for this problem, but people can get the idea by looking at the examples....

bool circularArrayLoop(vector<int>& nums) {

　　

　　int n = nums.size();

　　int curr = 0, next = 0;  // 2 points

 

　　for (int start = 0, size_cnt = 0; start < n; ){      //syntax 

　　curr = next;

　　next = (curr +(nums[curr] %n )+n )%n;

　　if (++size_cnt >n || nums[curr] * nums[next] < 0 || next == curr){

　　　　next = ++start;

　　　　size_cnt =0;

            }

　　else if (next == start){return true;}

}

return false;

}

 

Also more advanced solution can apply~