View Compilation Error

0_0_39513256_3805.cpp: In function 'int main()':
0_0_39513256_3805.cpp:49:28: error: 'n' was not declared in this scope
   49 |             scanf("%d%d", &n, &m);
      |                            ^
0_0_39513256_3805.cpp:49:32: error: 'm' was not declared in this scope
   49 |             scanf("%d%d", &n, &m);
      |                                ^
0_0_39513256_3805.cpp:52:34: error: 'a' was not declared in this scope
   52 |                 scanf("%d%d%d", &a, &b, &val);
      |                                  ^
0_0_39513256_3805.cpp:52:38: error: 'b' was not declared in this scope
   52 |                 scanf("%d%d%d", &a, &b, &val);
      |                                      ^
0_0_39513256_3805.cpp:52:42: error: 'val' was not declared in this scope
   52 |                 scanf("%d%d%d", &a, &b, &val);
      |                                          ^~~