View Compilation Error

0_0_36771658_29997.cpp: In function 'int main()':
0_0_36771658_29997.cpp:45:18: error: 'u' was not declared in this scope
    scanf("%d%d",&u,&v);
                  ^
0_0_36771658_29997.cpp:45:21: error: 'v' was not declared in this scope
    scanf("%d%d",&u,&v);
                     ^