题目：

题解：

class Solution {
public:int canCompleteCircuit(vector<int>& gas, vector<int>& cost) {int n = gas.size();int i = 0;while (i < n) {int sumOfGas = 0, sumOfCost = 0;int cnt = 0;while (cnt < n) {int j = (i + cnt) % n;sumOfGas += gas[j];sumOfCost += cost[j];if (sumOfCost > sumOfGas) {break;}cnt++;}if (cnt == n) {return i;} else {i = i + cnt + 1;}}return -1;}
};