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- #include<stdio.h>
- #include<bits/stdc++.h>
- #define READ freopen("input.txt","r",stdin)
- #define WRITE freopen("output.txt","w",stdout)
- #define ll long long
- #define MAX(a,b) a>b?a:b
- #define MIN(a,b) a<b?a:b
- #define siz 102
- using namespace std ;
- int n,k;
- char str[100];
- bool isvalid()
- {
- int k = 0;
- for(int i = 0; str[i]!='\0'; i++)
- {
- if(str[i]=='(') k++;
- else k-- ;
- if(k<0) return false ;
- }
- if(k==0) return true;
- else return false ;
- }
- void call(int l,int r)
- {
- if(l==n&&r==n)
- {
- str[k]='\0';
- if(isvalid())
- printf("%s\n",str) ;
- return ;
- }
- if(l<n)
- {
- str[k] ='(';
- k++ ;
- call(l+1,r);
- k--;
- }
- if(r<n)
- {
- str[k] =')';
- k++ ;
- call(l,r+1);
- k--;
- }
- }
- int main()
- {
- scanf("%d",&n);
- call(0,0);
- return 0;
- }
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