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  1. #include <bits/stdc++.h>
  2. #define pi 3.14159265359
  3. using namespace std;
  4.  
  5. int main() {
  6. 	int N;
  7. 	long long M;
  8. 	cin >> N >> M;
  9. 	if(M == 0) {cout << "0\n"; return 0;}
  10. 	vector<long long> A(N),B(N);
  11. 	for(int i =0; i < N; i++) cin >> A[i];
  12. 	for(int i =0; i < N; i++) cin >> B[i];
  13. 	long long Cmin =0,Cmax =1000000000+42;
  14. 	while(Cmax-Cmin > 1) {
  15. 		long long C =(Cmin+Cmax)/2, m =0;
  16. 		for(int i =0; i < N; i++) if(A[i] >= C) {
  17. 			long long k =(A[i]-C)/B[i]+1;
  18. 			m +=k;}
  19. 		if(m < M) Cmax =C;
  20. 		else Cmin =C;}
  21. 	long long ans =0, m =0;
  22. 	for(int i =0; i < N; i++) if(A[i] >= Cmax) {
  23. 		long long k =(A[i]-Cmax)/B[i]+1;
  24. 		m +=k;
  25. 		ans +=1LL*k*A[i]-B[i]*1LL*k*(k-1)/2;}
  26. 	ans +=(M-m)*max(1LL,Cmin);
  27. 	cout << ans << "\n";
  28. 	return 0;}
Success #stdin #stdout 0s 3436KB
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https://ideone.com/jiLm9i
SAU qual ACM 2014/15 H
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
secret

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