foo.cpp: In function 'int main()':
foo.cpp:8:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(int i=1;i<=m;i++)scanf("%d",a+i);std::sort(a+1,a+m+1);
  ^~~
foo.cpp:8:39: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
  for(int i=1;i<=m;i++)scanf("%d",a+i);std::sort(a+1,a+m+1);
                                       ^~~