/in/foo.cc: In function 'int main()':
/in/foo.cc:17:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int i = 0; i < m; i++)
                   ~~^~~
/in/foo.cc:20:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for (int j = 1; j <=n; j++)
                    ~~^~~
/in/foo.cc:25:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for (int j = 1; j <= n; j++)
                    ~~^~~~
/in/foo.cc:26:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int k = 1; k <= n; k++)
                     ~~^~~~
/in/foo.cc:33:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int i = 0; i < m; i++)
                   ~~^~~
/in/foo.cc:77:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < m; i++)
                  ~~^~~
/in/foo.cc:80:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if (i != m - 1)
       ~~^~~~~~~~