View Compilation Error

0_0_17897745_4785.cpp: In function 'int main()':
0_0_17897745_4785.cpp:19:26: error: 'n' was not declared in this scope
   while (~scanf("%d%d", &n, &m) && (n || m)) {
                          ^
0_0_17897745_4785.cpp:19:30: error: 'm' was not declared in this scope
   while (~scanf("%d%d", &n, &m) && (n || m)) {
                              ^
0_0_17897745_4785.cpp:23:21: error: 'v' was not declared in this scope
       scanf("%lf", &v[s[0] - 'a']);
                     ^