2022-05-21 Daily-Challenge

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In: DailyChallenge

Today I have done leetcode's May LeetCoding Challenge with cpp.

May LeetCoding Challenge 21

Description

Coin Change

You are given an integer array coins representing coins of different denominations and an integer amount representing a total amount of money.

Return the fewest number of coins that you need to make up that amount. If that amount of money cannot be made up by any combination of the coins, return -1.

You may assume that you have an infinite number of each kind of coin.

Example 1:

Input: coins = [1,2,5], amount = 11
Output: 3
Explanation: 11 = 5 + 5 + 1

Example 2:

Input: coins = [2], amount = 3
Output: -1

Example 3:

Input: coins = [1], amount = 0
Output: 0

Constraints:

  • 1 <= coins.length <= 12
  • 1 <= coins[i] <= 231 - 1
  • 0 <= amount <= 104

Solution

class Solution {
public:
  int coinChange(vector<int>& coins, int amount) {
    vector<int> dp(amount + 1, amount+1);
    dp[0] = 0;
    for(auto coin : coins){
      for(int i = coin; i <= amount; ++i) {
        dp[i] = min(dp[i], dp[i - coin] + 1);
      }
    }
    return dp.back() > amount ? -1 : dp.back();
  }
};

// Accepted
// 188/188 cases passed (108 ms)
// Your runtime beats 58.8 % of cpp submissions
// Your memory usage beats 68.59 % of cpp submissions (14.3 MB)
Algorithm