foo.cc: In function 'void sum(ll)':
foo.cc:138:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
     if (n > 1)
     ^~
foo.cc:140:2: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
  s=s%1000000007;
  ^
foo.cc: In function 'long long int ZH(ll, ll)':
foo.cc:148:24: warning: left operand of comma operator has no effect [-Wunused-value]
  for (i = m + 1,j=1; i <= n,j<=n-m; i++,j++)
                      ~~^~~~
foo.cc: In function 'void Test1()':
foo.cc:163:9: warning: variable 'obj' set but not used [-Wunused-but-set-variable]
  ll n,m,obj;
         ^~~
foo.cc: In function 'long long int ZH(ll, ll)':
foo.cc:157:10: warning: 'ret' may be used uninitialized in this function [-Wmaybe-uninitialized]
   ret=ret*10+ans.a[i];
       ~~~^~~

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