Submission #828229

#	Time	Username	Problem	Language	Result	Execution time	Memory
828229		tomruk	Packing Biscuits (IOI20_biscuits)	C++17	100 / 100	17 ms	1236 KiB

biscuits

#include "biscuits.h"
#include <bits/stdc++.h>
using namespace std;
long long count_tastiness(long long x, vector<long long> a){
	long long now = 0;
	while(a.size() < 60)
		a.push_back(0);
	for(int i = 0;i<a.size();i++){
		a[i] += now;
		now = 0;
		if(a[i] > x){
			now = (a[i] - x)/2;
			a[i] -= now * 2;
		}
	}
	int k = a.size();
	vector<long long> dp(k+1,0);
	dp[0] = 1;
	for(int i = 0;i<k;i++){
		dp[i+1] = dp[i];
		function<void(int,long long)> go = [&](int p,long long y) -> void{
			long long coef = 1;
			long long last = 0;
			int tmp = p;
			while(p > 0 && y < x * coef){
				if(x * coef - y > 1e18)
					break;
				coef *= 2;
				y *= 2;
				p--;
				if(y + a[p] >= x * coef){
					last = x*coef - y;
					y = x * coef;
				}
				else{
					last = a[p];
					y += a[p];
				}
				assert(y <= 1e18);
			}
			if(y < x * coef)
				return;
			dp[i + 1] += dp[p];
			if(tmp != p)
				go(p,a[p] - last);
			
		};
		go(i,a[i]);
	}
	return dp[k];
}

Compilation message (stderr)

biscuits.cpp: In function 'long long int count_tastiness(long long int, std::vector<long long int>)':
biscuits.cpp:8:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    8 |  for(int i = 0;i<a.size();i++){
      |                ~^~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 12 / 12
• Subtask 3: 21 / 21
• Subtask 4: 35 / 35
• Subtask 5: 23 / 23