View Compilation Error

0_0_21438758_27819.cpp: In function 'int main()':
0_0_21438758_27819.cpp:71:29: error: 'u' was not declared in this scope
             scanf("%d%d%d",&u,&v,&w);
                             ^
0_0_21438758_27819.cpp:71:32: error: 'v' was not declared in this scope
             scanf("%d%d%d",&u,&v,&w);
                                ^
0_0_21438758_27819.cpp:71:35: error: 'w' was not declared in this scope
             scanf("%d%d%d",&u,&v,&w);
                                   ^