17 lines
233 B
C++
17 lines
233 B
C++
#include<iostream>
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using namespace std;
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char a[255];
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int main()
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{
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int n=0,s=0;
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do
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{
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n++;
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cin>>a[n];
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if (a[n]=='(') s++;
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if (a[n]==')') s--;
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}while(a[n]!='@');
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if (s==0)cout<<"YES";
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else cout<<"NO";
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}
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