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- class Solution {
- public String largestNumber(int[] nums) {
- int total = 0;
- for(int i=0; i<nums.length;i++){
- total += nums[i];
- }
- if(total == 0) return "0";
- Stack<Integer> stack = new Stack<>();
- for(int i = 0; i < nums.length;i++){
- int smallest = i;
- for(int j = i+1; j < nums.length; j++){
- if(compare(nums[j], nums[smallest])){
- smallest = j;
- }
- }
- int temp = nums[i];
- nums[i] = nums[smallest];
- nums[smallest] = temp;
- }
- List<String> list = new ArrayList<>();
- for(int i = 0; i < nums.length;i++){
- while (nums[i]>=10){
- int temp = 0;
- temp = nums[i] % 10;
- nums[i] = nums[i]/10;
- stack.push(temp);
- }
- stack.push(nums[i]);
- while(!stack.isEmpty()){
- list.add(String.valueOf(stack.pop()));
- }
- }
- StringBuilder sb = new StringBuilder();
- for(String s: list)
- sb.append(s);
- return sb.toString();
- }
- public boolean compare(int a,int b){
- Stack<Integer> stack1 = new Stack<>();
- Stack<Integer> stack2 = new Stack<>();
- while(a>=10){
- int temp = 0;
- temp = a%10;
- a= a / 10;
- stack1.push(temp);
- }
- while (b>=10){
- int temp = 0;
- temp = b%10;
- b = b/10;
- stack2.push(temp);
- }
- if(a<b) return false;
- else if(a>b) return true;
- else{
- if(!stack1.isEmpty()&&!stack2.isEmpty()){
- return compare(numbuilder(stack1),numbuilder(stack2));}
- if(stack1.isEmpty()&& stack2.isEmpty())return true;
- if(stack1.isEmpty()) return a>stack2.pop();
- else return stack1.pop()>b;}
- }
- public int numbuilder(Stack<Integer> stack){
- List<Integer> list = new ArrayList<>();
- while(!stack.isEmpty()){
- list.add(stack.pop());}
- int result1 = 0;
- for(int i = 0 ; i < list.size();i++){
- result1+= list.get(i) * Math.pow(10, list.size()-1-i);}
- return result1;
- }
- }
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