Monthly Archives: August 2020

Spring – MultiValueMap and LinkedMultiValueMap

MultiValueMap is common object type in Spring Utils source code.

Here is an example of how to use it.

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MultiValueMap<String, String> multiValueMaps = new LinkedMultiValueMap<String, String>();
multiValueMaps.add("Tom", "Book");
multiValueMaps.add("Tom", "Pen");
 
multiValueMaps.add("ABC", "Company");
multiValueMaps.add("ABC", "WebSite");
 
for(String key: multiValueMaps.keySet()) {
	List<String> value = multiValueMaps.get(key);
	System.out.print(key + "\t");
	for(String s: value) {
		System.out.print(s + "\t");
	}
	System.out.println();
}

Leetcode – 1553. Minimum Number of Days to Eat N Oranges

DP using hashMap

https://leetcode.com/problems/minimum-number-of-days-to-eat-n-oranges/

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import java.util.HashMap;
 
public class MinimumNumberofDaystoEatNOranges_5490 {
 
	HashMap<Integer, Integer> hashMap = new HashMap<Integer, Integer>();
	public int minDays(int n) {
 
		hashMap.put(1, 1);
		hashMap.put(2, 2);
		hashMap.put(3, 2);
 
 
 
		return foo(n);
    }
 
	public int foo(int n) {		
		if(hashMap.containsKey(n))
			return hashMap.get(n);
 
		int a=Integer.MAX_VALUE,b=Integer.MAX_VALUE,c = Integer.MAX_VALUE;
 
		if(n%3 == 0 && n%2 == 0) {
			b = foo(n/3) + 1;
			a = foo(n/2) + 1;
		} 
		else if (n%3 == 0) {
 
			b = foo(n/3) + 1;
			c = foo(n - 1) + 1;
 
 
		}
		else if(n%2 == 0) {
			a = foo(n/2) + 1;
 
			c = foo(n - 1) + 1;
		}
		else {
			c = foo(n - 1) + 1;
		}
 
		int d = Math.min(Math.min(a,  b), c);
 
		hashMap.put(n, d);
		return d;
	}
 
	public static void main(String[] args) {
		MinimumNumberofDaystoEatNOranges_5490 s = new MinimumNumberofDaystoEatNOranges_5490();
		int n = 84806671;
 
		int result = s.minDays(n);
		System.out.println(result);
	}
}