View Compilation Error

0_0_16882139_1090.cpp:6:11: error: '::main' must return 'int'
 void main()
           ^
0_0_16882139_1090.cpp: In function 'int main()':
0_0_16882139_1090.cpp:12:26: error: 'memset' was not declared in this scope
 {   memset(dp,0,sizeof dp);
                          ^