foo.cc: In function 'void build(int, int, int)':
foo.cc:36:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=l+r>>1;
          ~^~
foo.cc: In function 'void change(int, int, int, int, int)':
foo.cc:49:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=l+r>>1;
          ~^~
foo.cc: In function 'long long int ask(int, int, int, int, int)':
foo.cc:59:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=l+r>>1;
          ~^~
foo.cc: In function 'int main()':
foo.cc:73:40: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long long int' [-Wformat=]
   if(op==1)printf("%d\n",ask(1,1,n,l,r));
                          ~~~~~~~~~~~~~~^

自豪的采用 HydroJudge 进行评测(github.com/hydro-dev/HydroJudge)

{"receive":"2020-07-10T12:25:17.761Z","handle":"2020-07-10T12:25:17.761Z","cache_start":"2020-07-10T12:25:17.769Z","read_cases":"2020-07-10T12:25:17.900Z","judge":"2020-07-10T12:25:17.903Z","done":"2020-07-10T12:25:19.233Z"}