Where is my code wrong??It’s giving WA…link text
code:-
#include <iostream>
#include <cstdio>
#include <cstring>
#include <cmath>
using namespace std;
int main()
{
ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
int t;
cin>>t;
while(t--)
{
int i,len,flag=-1,val=1;
char s[10001];
cin>>len;
cin>>s;
for(i=0;i<len;++i)
{
if(s[i]=='T')
{
if(flag==-1) {cout<<"Invalid\n";val=0;break;}
if(flag==1) flag=0;
}
if(s[i]=='H')
{
if(flag==-1) flag=1;
else if(flag==0) flag=1;
else {cout<<"Invalid\n";val=0;break;}
}
}
if(val==1&&flag==0) cout<<"Valid\n";
else if(val==1&&flag==-1)cout<<"Valid\n";
else if(val==1&&flag==1)cout<<"Invalid\n";
}
return 0;
}