View Compilation Error

0_0_29988612_20097.cpp: In function 'int main()':
0_0_29988612_20097.cpp:31:15: error: expected primary-expression before '==' token
    if(du[i]%2)==1sum++;
               ^
0_0_29988612_20097.cpp:31:17: error: unable to find numeric literal operator 'operator""sum'
    if(du[i]%2)==1sum++;
                 ^
0_0_29988612_20097.cpp:31:17: note: use -std=gnu++11 or -fext-numeric-literals to enable more built-in suffixes