foo.cc: In function ‘int main()’:
foo.cc:6:10: warning: ‘nt’ is used uninitialized [-Wuninitialized]
    6 |         n=nt;
      |         ~^~~
foo.cc:4:23: note: ‘nt’ was declared here
    4 |         int n,m,j1,j2,nt,nt1;
      |                       ^~
foo.cc:7:10: warning: ‘nt1’ is used uninitialized [-Wuninitialized]
    7 |         n=nt1;
      |         ~^~~~
foo.cc:4:26: note: ‘nt1’ was declared here
    4 |         int n,m,j1,j2,nt,nt1;
      |                          ^~~
foo.cc:8:17: warning: ‘j1’ is used uninitialized [-Wuninitialized]
    8 |         while(j1!=0) {
      |               ~~^~~
foo.cc:4:17: note: ‘j1’ was declared here
    4 |         int n,m,j1,j2,nt,nt1;
      |                 ^~
foo.cc:12:17: warning: ‘j2’ is used uninitialized [-Wuninitialized]
   12 |         while(j2!=0) {
      |               ~~^~~
foo.cc:4:20: note: ‘j2’ was declared here
    4 |         int n,m,j1,j2,nt,nt1;
      |                    ^~