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Add Chapter greedy for JS and TS code (#718)

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* Fix binary_search_tree TS code

* Update binary_search_tree js code style

* Add the JavaScript code for Chapter of Greedy

* Add the TypeScript code for Chapter of Greedy

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Co-authored-by: Yudong Jin <krahets@163.com>
This commit is contained in:
Justin Tse
2023-09-02 20:20:17 +08:00
committed by GitHub
parent 89a5f4d0d7
commit f96f583771
8 changed files with 330 additions and 0 deletions
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48
codes/javascript/chapter_greedy/coin_change_greedy.js Normal file
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/**
* File: coin_change_greedy.js
* Created Time: 2023-09-02
* Author: Justin (xiefahit@gmail.com)
*/
/* 零钱兑换：贪心 */
function coin_change_greedy(coins, amt) {
// 假设 coins 数组有序
let i = coins.length - 1;
let count = 0;
// 循环进行贪心选择，直到无剩余金额
while (amt > 0) {
// 找到小于且最接近剩余金额的硬币
while (i > 0 && coins[i] > amt) {
i--;
}
// 选择 coins[i]
amt -= coins[i];
count++;
}
// 若未找到可行方案，则返回 -1
return amt === 0 ? count : -1;
}
/* Driver Code */
// 贪心：能够保证找到全局最优解
let coins = [1, 5, 10, 20, 50, 100];
let amt = 186;
let res = coin_change_greedy(coins, amt);
console.log(`\ncoins = ${coins}, amt = ${amt}`);
console.log(`凑到 ${amt} 所需的最少硬币数量为 ${res}`);
// 贪心：无法保证找到全局最优解
coins = [1, 20, 50];
amt = 60;
res = coin_change_greedy(coins, amt);
console.log(`\ncoins = ${coins}, amt = ${amt}`);
console.log(`凑到 ${amt} 所需的最少硬币数量为 ${res}`);
console.log("实际上需要的最少数量为 3 ，即 20 + 20 + 20");
// 贪心：无法保证找到全局最优解
coins = [1, 49, 50];
amt = 98;
res = coin_change_greedy(coins, amt);
console.log(`\ncoins = ${coins}, amt = ${amt}`);
console.log(`凑到 ${amt} 所需的最少硬币数量为 ${res}`);
console.log("实际上需要的最少数量为 2 ，即 49 + 49");