/in/foo.cc: In function 'int main()':
/in/foo.cc:48:24: warning: suggest explicit braces to avoid ambiguous 'else' [-Wdangling-else]
   48 |                     if (x[a][1]!=m+1)
      |                        ^
/in/foo.cc:62:12: warning: suggest explicit braces to avoid ambiguous 'else' [-Wdangling-else]
   62 |         if (x[i][1]<=m)
      |            ^