foo.cc: In function 'int main()':
foo.cc:5:8: warning: unused variable 'm' [-Wunused-variable]
    5 |  int n,m,t,ts,maxn=0,maxx;
      |        ^
foo.cc:5:10: warning: unused variable 't' [-Wunused-variable]
    5 |  int n,m,t,ts,maxn=0,maxx;
      |          ^
foo.cc:5:12: warning: unused variable 'ts' [-Wunused-variable]
    5 |  int n,m,t,ts,maxn=0,maxx;
      |            ^~
foo.cc:5:22: warning: 'maxx' may be used uninitialized in this function [-Wmaybe-uninitialized]
    5 |  int n,m,t,ts,maxn=0,maxx;
      |                      ^~~~

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