View Compilation Error

0_0_25871839_32479.cpp: In function 'int main()':
0_0_25871839_32479.cpp:34:33: error: 'dis' was not declared in this scope
    minn=min(minn,dis(a[i],a[i-1]));//DISTANCE(a[i].x,a[i].y,a[i-1].x,a[i-1].y)
                                 ^