/in/foo.cc: In function 'void solve30()':
/in/foo.cc:10:18: error: 'a' was not declared in this scope
   if(s[0]=='f')  a[i]=0; else a[i]=1;
                  ^
/in/foo.cc:10:31: error: 'a' was not declared in this scope
   if(s[0]=='f')  a[i]=0; else a[i]=1;
                               ^
/in/foo.cc:12:18: error: 'a' was not declared in this scope
   if(s[0]=='a')  a[i]=2; else a[i]=3;
                  ^
/in/foo.cc:12:31: error: 'a' was not declared in this scope
   if(s[0]=='a')  a[i]=2; else a[i]=3;
                               ^
/in/foo.cc:16:17: error: 'l' was not declared in this scope
   scanf("%d%d",&l,&r);
                 ^
/in/foo.cc:16:20: error: 'r' was not declared in this scope
   scanf("%d%d",&l,&r);
                    ^
/in/foo.cc:18:17: error: 'ret' was not declared in this scope
   if(s[0]=='f') ret=0; else ret=1;
                 ^~~
/in/foo.cc:18:29: error: 'ret' was not declared in this scope
   if(s[0]=='f') ret=0; else ret=1;
                             ^~~
/in/foo.cc:20:24: error: 't' was not declared in this scope
   for(int i=1;i<l;i++) t.push_back(a[i]);
                        ^
/in/foo.cc:20:36: error: 'a' was not declared in this scope
   for(int i=1;i<l;i++) t.push_back(a[i]);
                                    ^
/in/foo.cc:21:3: error: 't' was not declared in this scope
   t.push_back(0);
   ^
/in/foo.cc:22:39: error: 'a' was not declared in this scope
   for(int i=r+1;i<=N;i++) t.push_back(a[i]);
                                       ^
/in/foo.cc:25:9: error: 'i' was not declared in this scope
   while(i<sz){
         ^
/in/foo.cc:27:7: error: 'tt' was not declared in this scope
       tt.push_back(t[i-1]);
       ^~