{"id":8373,"date":"2021-04-18T09:44:25","date_gmt":"2021-04-18T16:44:25","guid":{"rendered":"https:\/\/zxi.mytechroad.com\/blog\/?p=8373"},"modified":"2021-04-18T09:44:33","modified_gmt":"2021-04-18T16:44:33","slug":"leetcode-1833-maximum-ice-cream-bars","status":"publish","type":"post","link":"https:\/\/zxi.mytechroad.com\/blog\/greedy\/leetcode-1833-maximum-ice-cream-bars\/","title":{"rendered":"\u82b1\u82b1\u9171 LeetCode 1833. Maximum Ice Cream Bars"},"content":{"rendered":"\n

It is a sweltering summer day, and a boy wants to buy some ice cream bars.<\/p>\n\n\n\n

At the store, there are n<\/code> ice cream bars. You are given an array costs<\/code> of length n<\/code>, where costs[i]<\/code> is the price of the ith<\/sup><\/code> ice cream bar in coins. The boy initially has coins<\/code> coins to spend, and he wants to buy as many ice cream bars as possible. <\/p>\n\n\n\n

Return the maximum<\/strong> number of ice cream bars the boy can buy with <\/em>coins<\/code> coins.<\/em><\/p>\n\n\n\n

Note:<\/strong> The boy can buy the ice cream bars in any order.<\/p>\n\n\n\n

Example 1:<\/strong><\/p>\n\n\n\n

Input:<\/strong> costs = [1,3,2,4,1], coins = 7\nOutput:<\/strong> 4\nExplanation: <\/strong>The boy can buy ice cream bars at indices 0,1,2,4 for a total price of 1 + 3 + 2 + 1 = 7.\n<\/pre>\n\n\n\n
Example 2:<\/strong><\/p>\n\n\n\n
Input:<\/strong> costs = [10,6,8,7,7,8], coins = 5\nOutput:<\/strong> 0\nExplanation: <\/strong>The boy cannot afford any of the ice cream bars.\n<\/pre>\n\n\n\n
Example 3:<\/strong><\/p>\n\n\n\n
Input:<\/strong> costs = [1,6,3,1,2,5], coins = 20\nOutput:<\/strong> 6\nExplanation: <\/strong>The boy can buy all the ice cream bars for a total price of 1 + 6 + 3 + 1 + 2 + 5 = 18.\n<\/pre>\n\n\n\n
Constraints:<\/strong><\/p>\n\n\n\n
  • costs.length == n<\/code><\/li>
  • 1 <= n <= 105<\/sup><\/code><\/li>
  • 1 <= costs[i] <= 105<\/sup><\/code><\/li>
  • 1 <= coins <= 108<\/sup><\/code><\/li><\/ul>\n\n\n\n
    Solution: Greedy<\/strong><\/h2>\n\n\n\n
    Sort by price in ascending order, buy from the lowest price to the highest price.<\/p>\n\n\n\n
    Time complexity: O(nlogn)
    Space complexity: O(1)<\/p>\n\n\n\n
    \n
    C++<\/h2>\n
    \n\n
    \nclass Solution {\npublic:\n  int maxIceCream(vector& costs, int coins) {\n    sort(begin(costs), end(costs));\n    int ans = 0;\n    for (int c : costs) {\n      if (c > coins) break;\n      coins -= c;\n      ++ans;\n    }\n    return ans;\n  }\n};\n<\/pre>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"
    It is a sweltering summer day, and a boy wants to buy some ice cream bars. At the store, there are n ice cream bars. You are…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[51],"tags":[88,177,23],"class_list":["post-8373","post","type-post","status-publish","format-standard","hentry","category-greedy","tag-greedy","tag-medium","tag-sort","entry","simple"],"_links":{"self":[{"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/posts\/8373","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/comments?post=8373"}],"version-history":[{"count":2,"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/posts\/8373\/revisions"}],"predecessor-version":[{"id":8375,"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/posts\/8373\/revisions\/8375"}],"wp:attachment":[{"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/media?parent=8373"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/categories?post=8373"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zxi.mytechroad.com\/blog\/wp-json\/wp\/v2\/tags?post=8373"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}