Commit 41fef14

SumeetHaryaniTheSTL

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Added sort a stack problem and solution. (knaxus#85)

* add solution to sort a stack problem * update README.md * add time compexity

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`@@ -29,6 +29,8 @@ Collection of interview questions with Unit Tests. Problems includes Data Struct`
`29`	`29`	`- [Postfix Expression Evaluation](src/_DataStructures_/Stack/postfix-expression-evaluation)`
`30`	`30`	`- [Remove Consecutive Repeated Digits](src/_DataStructures_/Stack/remove-consecutive-repeated-digits)`
`31`	`31`	`- [Implement 2 Stacks using Single Array](src/_DataStructures_/Stack/2-stacks-using1-array)`
	`32`	`+ - [Sort a Stack](src/_DataStructures_/Stack/sort-a-stack)`
	`33`	`+`
`32`	`34`
`33`	`35`	`- [Queue](src/_DataStructures_/Queue)`
`34`	`36`

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`@@ -0,0 +1,36 @@`
	`1`	`+/**`
	`2`	`+ * Sort a stack with the help of a temporary stack.`
	`3`	`+ * Input:[1,10,21,3,9,-11,32]`
	`4`	`+ * Output:[32,21,10,9,3,1,-11]`
	`5`	`+ * Time Complexity:O(N^2)`
	`6`	`+*/`
	`7`	`+const Stack = require('../index');`
	`8`	`+`
	`9`	`+function sortStack(stack) {`
	`10`	`+ const tempStack = new Stack();`
	`11`	`+ while (!stack.isEmpty()) {`
	`12`	`+ //pop the first element from stack`
	`13`	`+ let temp = stack.pop();`
	`14`	`+ //for ascending order (tempStack.peek() < temp)`
	`15`	`+ while (!tempStack.isEmpty() && tempStack.peek() > temp) {`
	`16`	`+ stack.push(tempStack.pop());`
	`17`	`+ }`
	`18`	`+ //push the first element(temp) onto tempStack if tempStack.peek()<temp`
	`19`	`+ tempStack.push(temp);`
	`20`	`+ }`
	`21`	`+ return tempStack;`
	`22`	`+}`
	`23`	`+/*`
	`24`	`+const s = new Stack();`
	`25`	`+`
	`26`	`+s.push(1);`
	`27`	`+s.push(10);`
	`28`	`+s.push(21);`
	`29`	`+s.push(3);`
	`30`	`+s.push(9);`
	`31`	`+s.push(-11);`
	`32`	`+s.push(32);`
	`33`	`+console.log(s.data);`
	`34`	`+const s1 = sortStack(s);`
	`35`	`+console.log(s1.data);`
	`36`	`+*/`

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