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Merged
merged 1 commit into from
Nov 5, 2020
Merged

add array solution for 1381 #127

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39 changes: 39 additions & 0 deletions src/main/java/com/fishercoder/solutions/_1381.java
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Original file line number Diff line number Diff line change
Expand Up @@ -79,4 +79,43 @@ public void increment(int k, int val) {
}
}
}

/**
* Implementation of Stack using Array
*/
public static class Solution2{
public static class CustomStack {
private int top;
private int maxSize;
private int stack[];
public CustomStack(int maxSize) {
this.maxSize = maxSize;
this.stack = new int[maxSize];
}

public void push(int x) {
if(top == maxSize) return;
stack[top] = x;
top++;
}

public int pop() {
if(top == 0)
return -1;
int popValue = stack[top-1];
stack[top-1] = 0;
top--;
return popValue;
}

public void increment(int k, int val) {
if(top == 0 || k == 0) return;
for(int i = 0; i<k; i++){
if(i == top)
break;
stack[i] += val;
}
}
}
}
}
16 changes: 16 additions & 0 deletions src/test/java/com/fishercoder/_1381Test.java
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,7 @@

public class _1381Test {
private static _1381.Solution1.CustomStack customStack;
private static _1381.Solution2.CustomStack customStack2;

@Test
public void test1() {
Expand All @@ -24,5 +25,20 @@ public void test1() {
assertEquals(201, customStack.pop());
assertEquals(-1, customStack.pop());
}
@Test
public void test2() {
customStack2 = new _1381.Solution2.CustomStack(3);
customStack2.push(-1);
customStack2.push(20);
assertEquals(20, customStack2.pop());
customStack2.push(30);
customStack2.push(40);
customStack2.push(50);
customStack2.increment(5, 100);
assertEquals(140, customStack2.pop());
assertEquals(130, customStack2.pop());
assertEquals(99, customStack2.pop());

}

}