foo.cc: In function 'void bfs()':
foo.cc:115:7: warning: unused variable 'j' [-Wunused-variable]
  115 | int i,j;
      |       ^
foo.cc: In function 'int main()':
foo.cc:162:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
  162 | freopen("river.in","r",stdin);
      | ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
foo.cc:163:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
  163 | freopen("river.out","w",stdout);
      | ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:164:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  164 | scanf("%d%d%d",&m,&n,&k);
      | ~~~~~^~~~~~~~~~~~~~~~~~~
foo.cc:167:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  167 | scanf("%d%d",&fit[i].a,&fit[i].b);
      | ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

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