foo.cpp: In function 'int main()':
foo.cpp:14:80: error: expected ')' before 'v'
                 for(int k=i+1;k<j;k++) f[i][j]=max(f[i][j],f[i][k]+f[k][j]+v[i]v[k]v[j]),ans=max(f[i][j],ans);
                                                                                ^