foo.cc: In function 'void SetU(int, int, int*, int*)':
foo.cc:22:21: warning: unused variable 'k' [-Wunused-variable]
     int i, j, c[N], k = 0;
                     ^
foo.cc: In function 'int main()':
foo.cc:33:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d%d", &m, &n, &p);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~
foo.cc:35:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &a[i]);
         ~~~~~^~~~~~~~~~~~~
foo.cc:37:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &b[i]);
         ~~~~~^~~~~~~~~~~~~
foo.cc:39:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &c[i]);
         ~~~~~^~~~~~~~~~~~~

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