29 lines
678 B
JavaScript
29 lines
678 B
JavaScript
/**
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* https://leetcode.cn/problems/gas-station/?envType=study-plan-v2&envId=top-interview-150
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* @param {number[]} gas
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* @param {number[]} cost
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* @return {number}
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*/
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const canCompleteCircuit = function (gas, cost) {
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let totalGas = 0; let
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totalCost = 0;
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let currentGas = 0;
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let start = 0;
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for (let i = 0; i < gas.length; i++) {
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totalGas += gas[i];
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totalCost += cost[i];
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currentGas += gas[i] - cost[i];
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// 如果油量不足，更新起点为下一个加油站
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if (currentGas < 0) {
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start = i + 1;
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currentGas = 0;
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}
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}
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// 如果总油量小于总油耗，无法完成一圈
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return totalGas < totalCost ? -1 : start;
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};
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