foo.cc: In function 'int main()':
foo.cc:123:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for (int j=0;j<a_s[i].size();j++)
                          ~^~~~~~~~~~~~~~
foo.cc:138:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for (int j=0;j<b_s[i].size();j++)
                          ~^~~~~~~~~~~~~~
foo.cc:155:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for (int i=0;i<p_1_s.size();i++)
                          ~^~~~~~~~~~~~~
foo.cc:161:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
                 for (int i=0;i<p_2_s.size();i++)
                              ~^~~~~~~~~~~~~
foo.cc:122:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d%d%s",&a_x[i],&a_y[i],&(a_s[i][0]));
             ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:137:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d%d%s",&b_x[i],&b_y[i],&(b_s[i][0]));
             ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:160:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
                 scanf("%s%d",&(p_2_s[0]),&p);
                 ~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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