Submission #1075183

#	Time	Username	Problem	Language	Result	Execution time	Memory
1075183		allin27x	Packing Biscuits (IOI20_biscuits)	C++17	42 / 100	1081 ms	79916 KiB

biscuits

#include <bits/stdc++.h>
using namespace std;
#include "biscuits.h"
#define int long long

unordered_map<int,int> memo;
vector<int> A;
int n,X;

int dp(int i, int add) {
	int id = 130 * add + i;
	if (memo.count(id)) return memo[id];
	if (i==n-1) return memo[id] = add+1;
	if (A[i] + add < X) return memo[id]=dp(i+1, (A[i]+add)/2);
	return memo[id] = dp(i+1, (A[i]+add)/2) + dp(i+1, (A[i]+add-X)/2);
}

long long count_tastiness(long long x, std::vector<long long> a) {
	a.resize(a.size()+65, 0);n = a.size(); X=x; memo.clear();
	int extra = 0;
	for (int i=0; i<a.size(); i++) {
		extra/=2; a[i] += extra; extra = 0;
		if (a[i] < x+2) continue;
		if ((a[i]-x)&1) {
			extra = a[i] - x - 1; a[i] = x+1;
		} else {
			extra = a[i] - x; a[i] = x;
		}
	}
	A=a;
	return dp(0,0);
}

Compilation message (stderr)

biscuits.cpp: In function 'long long int count_tastiness(long long int, std::vector<long long int>)':
biscuits.cpp:21:17: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |  for (int i=0; i<a.size(); i++) {
      |                ~^~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 12 / 12
• Subtask 3: 21 / 21
• Subtask 4: 0 / 35
• Subtask 5: 0 / 23