gas-station leetcode C++

There are N gas stations along a circular route, where the amount of gas at station i isgas[i].

You have a car with an unlimited gas tank and it costscost[i]of gas to travel from station i to its next station (i+1). You begin the journey with an empty tank at one of the gas stations.

Return the starting gas station's index if you can travel around the circuit once, otherwise return -1.

Note: The solution is guaranteed to be unique.

C++

class Solution {

public:

    int canCompleteCircuit(vector<int> &gas, vector<int> &cost) {

        int total = 0, sum = 0;

        int index = -1;

        for (int i = 0; i < gas.size(); i++) {

            sum += gas[i] - cost[i];

            total += gas[i] - cost[i];

            if (sum < 0) {

                sum = 0;

                index = i;

            }

        }

        return total >= 0 ? index + 1 : -1;

    }

};

巴特西

gas-station leetcode C++

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