/in/foo.cc: In function 'int main()':
/in/foo.cc:9:6: error: 'i' was not declared in this scope
  for(i=0;i<6;i++){
      ^
/in/foo.cc:17:7: error: 'i' was not declared in this scope
   for(i=0;i<=t/2;i++){
       ^
/in/foo.cc:23:7: error: 'j' was not declared in this scope
   for(j=0;j<=t;j++){
       ^
/in/foo.cc:30:9: error: 'i' was not declared in this scope
     for(i=0;i<t;i++){
         ^
/in/foo.cc:35:9: error: 'i' was not declared in this scope
     for(i=n;i<t;i++){
         ^
/in/foo.cc:38:8: error: 'i' was not declared in this scope
    for(i=t-1;i>=0;i--){
        ^