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#include
using
#define
#define
#define
#define
#define
#define
typedef
typedef
const
//head
const
int
int
void
sum[rt] = sum[rt>1
if
else
}
return
}
int
int
while
mid = l+r>>1
if
else
}
return
//cout>1
if
else
}
return
}
int
int
while
mid = l+r>>1
if
else
}
return
}
int
int
#ifdef
freopen("2.in"
#endif
while
stack
memset
memset
rep(i,1
while
char
if
int
st.push(x);
if
vis[x] = 1
add(x,-1
}else
int
if
else
}else
add(st.top(),1
vis[st.top()] = 0
st.pop();
}
}
}

return
}