Submission #614186

#	Time	Username	Problem	Language	Result	Execution time	Memory
614186		penguinhacker	Packing Biscuits (IOI20_biscuits)	C++17	100 / 100	23 ms	1364 KiB

biscuits

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

#define ll long long
#define ar array

ll count_tastiness(ll x, vector<ll> a) {
	vector<ll> v(60);
	for (int i=0; i<a.size(); ++i)
		v[i]+=(1ll*a[i])<<i;
	for (int i=1; i<60; ++i)
		v[i]+=v[i-1];
	for (int i=0; i<60; ++i)
		v[i]=min(v[i]/x, (1ll<<i+1)-1);
	vector<vector<ll>> dp(60, vector<ll>(60));
	for (int i=0; i<60; ++i) {
		for (int j=i; j<60; ++j) {
			ll mask=v[j]&((1ll<<i+1)-1);
			if (!i) {
				dp[i][j]=mask+1;
				continue;
			}
			if (mask&1ll<<i)
				dp[i][j]=dp[i-1][i-1]+dp[i-1][mask-(1ll<<i)<=v[i-1]?j:i-1];
			else
				dp[i][j]=dp[i-1][mask<=v[i-1]?j:i-1];
		}
	}
	return dp[59][59];
}

Compilation message (stderr)

biscuits.cpp: In function 'long long int count_tastiness(long long int, std::vector<long long int>)':
biscuits.cpp:10:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |  for (int i=0; i<a.size(); ++i)
      |                ~^~~~~~~~~
biscuits.cpp:15:27: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
   15 |   v[i]=min(v[i]/x, (1ll<<i+1)-1);
      |                          ~^~
biscuits.cpp:19:25: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
   19 |    ll mask=v[j]&((1ll<<i+1)-1);
      |                        ~^~

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