[Vssue]0134.加油站.md

[youngyangyang04]

https://www.programmercarl.com/0134.%E5%8A%A0%E6%B2%B9%E7%AB%99.html

[Du1in9]

int temp = 0, sum = 0, start = 0;
for (int i = 0; i < gas.length; i++) {
    temp += gas[i] - cost[i];
    sum += gas[i] - cost[i];
    if (temp < 0) {
        temp = 0;
        start = i + 1;
    }
}
if (sum < 0) return -1;
return start;

// 例: gas = [2,5,2,3,5], cost = [1,2,8,2,4], start = 0
i = 0: temp = 0 + 1 = 1（不重计）, sum = 0 + 1 = 1
i = 1: temp = 1 + 3 = 4（不重计）, sum = 1 + 3 = 4
i = 2: temp = 4 + -6 = -2（要重计）, sum = 4 + -6 = -2, temp = 0, start = 3
i = 3: temp = 0 + 1 = 1（不重计）, sum = -2 + 1 = -1
i = 4: temp = 1 + 1 = 2（不重计）, sum = -1 + 1 = 0  // sum >= 0 存在解

[hellobo2802]

start = i + 1 不会越界吗？