foo.cc: In function 'void gen()':
foo.cc:27:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%u%u%u%d%d",&SA, &SB, &SC, &A, &B);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:28:37: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for(int i = 1; i <= p; i++)scanf("%d%d", &a[i], &b[i]);
                                ~~~~~^~~~~~~~~~~~~~~~~~~~~~

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