foo.cc: In function 'void init()':
foo.cc:40:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
40 | scanf("%d",&w);
| ~~~~~^~~~~~~~~
foo.cc:41:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
41 | scanf("%d",&n);
| ~~~~~^~~~~~~~~
foo.cc:44:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
44 | scanf("%d",&a[i]);
| ~~~~~^~~~~~~~~~~~
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