View Compilation Error

0_0_21383751_19973.cpp: In function 'int main()':
0_0_21383751_19973.cpp:59:22: error: too few arguments to function 'int mix(int, int)'
         if(mix(a[i].u),a[i].v)
                      ^
0_0_21383751_19973.cpp:21:5: note: declared here
 int mix(int x,int y)
     ^