问题描述
代码如下:
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)
{
start = i + 1;
sum = 0;
}
}
return (total < 0) ? -1 : start;
}
};