View Compilation Error

0_0_32879290_30094.cpp: In function 'int main()':
0_0_32879290_30094.cpp:75:6: error: expected '(' before 'tag'
   if tag : cout << 0 << endl;
      ^
0_0_32879290_30094.cpp:76:3: error: 'else' without a previous 'if'
   else{
   ^