View Compilation Error

0_0_20430827_20840.cpp: In function 'int main()':
0_0_20430827_20840.cpp:51:27: error: 'from' was not declared in this scope
             scanf("%d%d",&from,&to);
                           ^
0_0_20430827_20840.cpp:51:33: error: 'to' was not declared in this scope
             scanf("%d%d",&from,&to);
                                 ^