View Compilation Error

0_0_38573907_18939.cpp: In function 'void solve()':
0_0_38573907_18939.cpp:105:12: error: expected ';' before 'if'
   cin >> op
            ^
            ;
   if (op == "t") {
   ~~        
0_0_38573907_18939.cpp:110:5: error: 'else' without a previous 'if'
   } else {
     ^~~~