/in/foo.cc: In function 'void S5()':
/in/foo.cc:115:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
      for(int k=0;k<p[a][b].size();k++)
                  ~^~~~~~~~~~~~~~~
/in/foo.cc:110:4: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
    for(int i=h[x];i;i=q[i].next)
    ^~~
/in/foo.cc:122:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
     for(int i=h[x];i;i=q[i].next)
     ^~~
/in/foo.cc:134:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
      for(int k=0;k<p[a][b].size();k++)
                  ~^~~~~~~~~~~~~~~