LeetCode134.加油站

LeetCode134.加油站

class Solution {
public:
    int canCompleteCircuit(vector<int>& gas, vector<int>& cost) {
        int len = gas.size();
        for (int i = 0; i < len; i++) {
            bool flag = true;
			int remain = 0;
            int start = i;
			remain += gas[start % len] - cost[start % len];
			if (remain < 0) {
				flag = false;
				continue;
			}
			start++;
            while (start % len != i) {
				remain += gas[start % len] - cost[start % len];
                if (remain < 0) {
                    flag = false;
                    break;
                }
                start++;
            }
            if (flag) return i;
        }
        return -1;
    }
};