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- #include <iostream>
- using namespace std;
- const int MAX=255;
- char a[MAX], s[MAX];
- int k=0;
- int main() {
- cin>>s;
- for(int i = 0; i <strlen(s); i++) {
- if ((s[i]=='(' || s[i]=='[' || s[i]=='{') && k<MAX) a[++k]=s[i];
- if ((s[i]==')' && a[k]=='(' || s[i]==']' && a[k]=='[' || s[i]=='}' && a[k]=='{') && k>=1) k--;
- }
- if (k==0) cout<<"no"; else cout<<"yes";
- return 0;
- }
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