foo.cc: In function ‘int main()’:
foo.cc:7:2: warning: ‘nt’ is used uninitialized [-Wuninitialized]
    7 | n=nt;
      | ~^~~
foo.cc:5:15: note: ‘nt’ was declared here
    5 | int n,m,j1,j2,nt,nt1;
      |               ^~
foo.cc:8:2: warning: ‘nt1’ is used uninitialized [-Wuninitialized]
    8 | n=nt1;
      | ~^~~~
foo.cc:5:18: note: ‘nt1’ was declared here
    5 | int n,m,j1,j2,nt,nt1;
      |                  ^~~
foo.cc:9:9: warning: ‘j1’ is used uninitialized [-Wuninitialized]
    9 | while(j1!=0)
      |       ~~^~~
foo.cc:5:9: note: ‘j1’ was declared here
    5 | int n,m,j1,j2,nt,nt1;
      |         ^~
foo.cc:14:9: warning: ‘j2’ is used uninitialized [-Wuninitialized]
   14 | while(j2!=0)
      |       ~~^~~
foo.cc:5:12: note: ‘j2’ was declared here
    5 | int n,m,j1,j2,nt,nt1;
      |            ^~