[LeetCode] Gas Station
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There are N gas stations along a circular route, where the amount of gas at station i is gas[i]
.
You have a car with an unlimited gas tank and it costs cost[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.
class Solution {public: int canCompleteCircuit(vector<int> &gas, vector<int> &cost) { int total = 0, sum = 0, start = 0; for(int i = 0; i < gas.size(); i++) { total += gas[i] - cost[i]; sum += gas[i] - cost[i]; if(sum < 0){ sum = 0; start = i + 1; } } return total < 0 ? -1 : start; }};对于一个循环数组,如果这个数组整体和sum>=0,那么必然可以再数组中找到这么一个元素,从这个元素出发,绕数组一圈,能报中国累加和一直是非负。
参考:http://www.cnblogs.com/felixfang/p/3814463.html
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