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#include <stdio.h>
 
int main(void) {
	int testcase;
	scanf("%d",&testcase);
	while(testcase--){
		int size,i,flag=0,count=0,j,c=0;
		scanf("%d",&size);
		char str[size];
		scanf("%s",&str);
		for(i=0;i<size;i++){
			if(str[i]=='T' && c=0){
				 printf("invalid\n");
			}
			else if(str[i]=='H'){
				c++;
				for(j=i+1;j<size;j++){
					if(str[j]==str[i]){
					  flag=1;
					  break;
					}
			}
			else if(str[i]=='T'){
				c++;
				for(j=i+1;j<size;j++){
					if(str[j]==str[i]){
					  flag=1;
					  break;
					}
			}
			if(flag==1)
			 break;
		}
		if(flag==1)
		 printf("invalid\n");
		else
		 printf("valid\n");
 
	}
	// your code goes here
	return 0;
}
 

prog.c: In function ‘main’:
prog.c:10:11: warning: format ‘%s’ expects argument of type ‘char *’, but argument 2 has type ‘char (*)[(sizetype)(size)]’ [-Wformat=]
   scanf("%s",&str);
           ^
prog.c:12:23: error: lvalue required as left operand of assignment
    if(str[i]=='T' && c=0){
                       ^
prog.c:23:4: error: expected ‘}’ before ‘else’
    else if(str[i]=='T'){
    ^~~~
prog.c:7:21: warning: unused variable ‘count’ [-Wunused-variable]
   int size,i,flag=0,count=0,j,c=0;
                     ^~~~~
prog.c:42:1: error: expected declaration or statement at end of input
 }
 ^

Standard output is empty