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happyZYM
2023-08-03 09:22:52 +08:00
commit de60cd6ed4
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history_source/信息学奥赛一本通/3.1.3.cpp Normal file
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#include<iostream>
#include<string>
#include<map>
using namespace std;
char stack[260]={'s','\0'},li;
int top=1;
map<char,int>f;
bool answer(string a)
{
top=1;
for(int i=0;i<a.size();i++)
{
switch(a[i])
{
case '(':stack[top++]='(';
if(f[stack[top-1]]>f[stack[top-2]]) return 0;
break;
case '[':stack[top++]='[';
if(f[stack[top-1]]>f[stack[top-2]]) return 0;
break;
case '{':stack[top++]='{';
if(f[stack[top-1]]>f[stack[top-2]]) return 0;
break;
case '<':stack[top++]='<';
if(f[stack[top-1]]>f[stack[top-2]]) return 0;
break;
case ')':
if(stack[top-1]=='(') top--;
else return 0;
break;
case ']':
if(stack[top-1]=='[') top--;
else return 0;
break;
case '}':
if(stack[top-1]=='{') top--;
else return 0;
break;
case '>':
if(stack[top-1]=='<') top--;
else return 0;
break;
}
}
if(top==1) return 1;
return 0;
}
int main()
{
f['<']=0;f['>']=4;
f['(']=1;f[')']=4;
f['[']=2;f[']']=4;
f['{']=3;f['}']=4;
f['s']=5;
int n;
cin>>n;
bool ans[n];
string li;
getline(cin,li);
for(int i=0;i<n;i++)
{
getline(cin,li);
ans[i]=answer(li);
}
for(int i=0;i<n;i++)
{
if(ans[i]) printf("YES\n");
else printf("NO\n");
}
return 0;
}