View Compilation Error

0_0_21593482_30576.cpp:19:11: error: stray '#' in program
 if(a[3]=='h') S.insert(m);
           ^
0_0_21593482_30576.cpp:19:17: error: stray '#' in program
 if(a[3]=='h') S.insert(m);
                 ^
0_0_21593482_30576.cpp: In function 'int main()':
0_0_21593482_30576.cpp:19:12: error: lvalue required as unary '&' operand
 if(a[3]=='h') S.insert(m);
            ^
0_0_21593482_30576.cpp:19:14: error: expected ')' before ';' token
 if(a[3]=='h') S.insert(m);
              ^
0_0_21593482_30576.cpp:19:15: error: 'h' was not declared in this scope
 if(a[3]=='h') S.insert(m);
               ^
0_0_21593482_30576.cpp:19:21: error: expected primary-expression before ')' token
 if(a[3]=='h') S.insert(m);
                     ^
0_0_21593482_30576.cpp:20:1: error: 'else' without a previous 'if'
 else 
 ^