View Compilation Error

0_0_20931982_29028.cpp: In function 'int main()':
0_0_20931982_29028.cpp:11:21: error: 'i' was not declared in this scope
         for(sum=max=i=0;i<n;i++){
                     ^
0_0_20931982_29028.cpp:21:35: error: 'memset' was not declared in this scope
             memset(dp,0,sizeof(dp));
                                   ^
0_0_20931982_29028.cpp:29:52: error: 'max' cannot be used as a function
                     dp[j]=max(dp[j],dp[j-v[i]]+v[i]);
                                                    ^