LeetCode: Gas Station

LeetCode: Gas Station

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/**
* Created by hzhou on 5/12/15. [email protected]
*/
public class GasStation {
public int canCompleteCircuit(int[] gas, int[] cost) {
if (gas == null || cost == null || gas.length != cost.length) {
return -1;
}
int total, start, sumRemain;
start = total = sumRemain = 0;
for (int i = 0; i < gas.length; i++) {
int remain = gas[i] - cost[i];
if (sumRemain >= 0) {
sumRemain += remain;
} else {
sumRemain = remain;
start = i;
}
total += remain;
}
return total >= 0 ? start : -1;
}
}