/in/foo.cc: In function 'int erfen(double)':
/in/foo.cc:13:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   int mid=L+R>>1;
           ~^~
/in/foo.cc: In function 'int main()':
/in/foo.cc:24:24: warning: format '%lld' expects argument of type 'long long int*', but argument 2 has type 'int*' [-Wformat=]
  scanf("%lld%lld",&n,&s);
                        ^
/in/foo.cc:24:24: warning: format '%lld' expects argument of type 'long long int*', but argument 3 has type 'int*' [-Wformat=]
/in/foo.cc:26:25: warning: format '%lld' expects argument of type 'long long int*', but argument 2 has type 'int*' [-Wformat=]
   scanf("%lld%lld",&x,&y);
                         ^
/in/foo.cc:26:25: warning: format '%lld' expects argument of type 'long long int*', but argument 3 has type 'int*' [-Wformat=]
/in/foo.cc:36:20: warning: format '%lld' expects argument of type 'long long int', but argument 2 has type 'int' [-Wformat=]
  printf("%lld",f[n]);
                    ^