题目：

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代码(首刷看解析 2024年2月15日）：

class Solution {
public:int canCompleteCircuit(vector<int>& gas, vector<int>& cost) {int curSum = 0;int sum = 0;int startIndex = 0;for (int i = 0; i < gas.size(); ++i) {curSum += gas[i] - cost[i];sum += gas[i] - cost[i];if (curSum < 0) {startIndex = i + 1;curSum = 0;}}if (sum < 0) return -1;return startIndex;}
};