foo.cc: In function 'int main()':
foo.cc:85:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   85 |     scanf("%d%d", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~
foo.cc:86:39: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   86 |     for (int i = 1; i <= n; ++i) scanf("%d", &a[i]);
      |                                  ~~~~~^~~~~~~~~~~~~
foo.cc:89:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   89 |         scanf("%d%d", &u, &v);
      |         ~~~~~^~~~~~~~~~~~~~~~
foo.cc:97:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   97 |         int opt, x, a; scanf("%d", &opt);
      |                        ~~~~~^~~~~~~~~~~~
foo.cc:99:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   99 |             scanf("%d%d", &x, &a);
      |             ~~~~~^~~~~~~~~~~~~~~~
foo.cc:103:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  103 |             scanf("%d%d", &x, &a);
      |             ~~~~~^~~~~~~~~~~~~~~~
foo.cc:106:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  106 |             scanf("%d", &x);
      |             ~~~~~^~~~~~~~~~

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Found 10 testcases.
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