View Compilation Error

0_0_36272625_17713.cpp: In function 'void multi_knapsack()':
0_0_36272625_17713.cpp:27:7: error: expected primary-expression before ')' token
    if()
       ^
0_0_36272625_17713.cpp:28:3: error: expected primary-expression before '}' token
   }
   ^
0_0_36272625_17713.cpp: In function 'int main()':
0_0_36272625_17713.cpp:42:5: error: expected ';' before 'return'
     return 0;
     ^