#include #define MOD 1000000007 #define pe(str) return cout<<(str)<=0;i--) #define rep(i,a,b) for(int i=(a);i<(b);i++) #define rrep(i,a,b) for(int i=(b);i>=(a);i--) #define bw(a,b,c) (((a)<=(b))&&((b)<=(c))) #define spre(a) setprecision(a) #define all(a) a.begin(),a.end() #define rall(a) a.rbegin(),a.rend() using namespace std; typedef long long ll; typedef unsigned long long ull; typedef long double ld; typedef pair pii; typedef complex point; template void dump(InputIterator first,InputIterator last,char delim=' '){ for(InputIterator it=first;it!=last;it++){ if(it!=first)cout< void swp(T &a,T &b){ T t=a; a=b; b=t; } // No65 int main(void){ int n,d,k; cin>>n>>d>>k; int a[k]; re(i,k)a[i]=i+1; int t=0; if(accumulate(a+n-k,a+n,0)d)pe(-1); int i=0; TT: while(t