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860.柠檬水找零.js
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860.柠檬水找零.js
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/*
* @lc app=leetcode.cn id=860 lang=javascript
*
* [860] 柠檬水找零
*/
// @lc code=start
/**
* @param {number[]} bills
* @return {boolean}
*/
var lemonadeChange = function (bills) {
const arr = [];
for (let i = 0; i < bills.length; i++) {
if (i === 0 && bills[i] > 5) return false;
if (bills[i] === 5) arr.unshift(5);
if (bills[i] === 10) {
if (arr[0] === 5) {
arr.shift();
arr.push(bills[i]);
} else {
return false;
}
}
if (bills[i] === 20) {
const idx = arr.findIndex((value) => value === 10);
if (arr[0] === 5 && idx > 0) {
arr.splice(idx, 1);
arr.shift();
continue;
}
if ((arr[0] === 5 && arr[1] === 5 && arr[2]) === 5) {
arr.splice(0, 3);
continue;
}
return false;
}
}
return true;
};
// @lc code=end