View Compilation Error

0_0_25754116_7533.cpp: In function 'void sol()':
0_0_25754116_7533.cpp:16:69: error: expected primary-expression before ')' token
         for(int j = 0 ; j < 26 ; ++ j) if(cnt[r][j] - cnt[l - 1][j])) { putchar(j + 'a'); break; }
                                                                     ^