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RemoveKdigits.java
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64 lines (53 loc) · 1.1 KB
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package com.duke.stack;
import java.util.Stack;
/**
* @author thakurde
* https://leetcode.com/problems/remove-k-digits/
*
*/
public class RemoveKdigits {
public static void removeKdigits(String num, int k)
{
int len = num.length();
if (k >= len)
{
System.out.println("Digit: "+0);
return;
}
if (k == 0)
{
System.out.println("Digit: "+0);
return;
}
Stack<Character> st = new Stack<>();
int i = 0;
st.push(num.charAt(i));
i++;
while (i < len) {
char val = num.charAt(i);
if (!st.isEmpty() && st.peek() < val) {
st.push(val);
} else {
if (k > 0) {
st.pop();
k--;
st.push(val);
} else {
st.push(val);
}
}
i++;
}
StringBuilder builder = new StringBuilder();
while(!st.isEmpty())
{
builder.append(st.pop());
}
System.out.println("Final removed K digit number: "+builder.reverse());
}
public static void main(String[] args) {
String num = "121198"; //"765028321"; //"1432219";
int k = 5;
RemoveKdigits.removeKdigits(num, k);//1219
}
}