Problem Description:
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.
Solution:
1 public int canCompleteCircuit(int[] gas, int[] cost) { 2 3 for (int i = 0; i < gas.length; i++) { 4 int total = 0; 5 int j = 0; 6 for (; j < gas.length; j++) { 7 total += gas[(i+j) % gas.length] - cost[(i+j) % gas.length]; 8 9 if (total < 0) { 10 i += j; 11 break; 12 } 13 } 14 15 if (j == gas.length) { 16 return i; 17 } 18 } 19 20 return -1; 21 }
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原文：http://www.cnblogs.com/liew/p/3815087.html