foo.cc: In function 'int main()':
foo.cc:19:12: warning: unused variable 'j' [-Wunused-variable]
     int i, j, k, t;
            ^
foo.cc:19:15: warning: unused variable 'k' [-Wunused-variable]
     int i, j, k, t;
               ^
foo.cc:19:18: warning: unused variable 't' [-Wunused-variable]
     int i, j, k, t;
                  ^
foo.cc:21:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d%d", &n, &a, &b);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~
foo.cc:24:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &q[i]);
         ~~~~~^~~~~~~~~~~~~

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