/in/foo.cc: In function 'void updata(int&, int, int, int)':
/in/foo.cc:28:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
     if (!o) o=++size;sum[o]++;  
     ^~
/in/foo.cc:28:22: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
     if (!o) o=++size;sum[o]++;  
                      ^~~