Submission #314872

#	Time	Username	Problem	Language	Result	Execution time	Memory
314872		kostia244	Packing Biscuits (IOI20_biscuits)	C++17	0 / 100	500 ms	760 KiB

biscuits

#include "biscuits.h"
#include<bits/stdc++.h>
#define all(x) begin(x), end(x)
using namespace std;
using ll = long long;
const int B = 126;
vector<ll> convert(__int128 x) {
	vector<ll> a(B);
	for(int i = 0; i < B; i++) a[i] += x&1, x/=2;
	return a;
}
ll count_tastiness(ll x, vector<ll> a) {
	__int128 k = 0;
	a.resize(B);
	vector<vector<ll>> con;
	for(int i = 0; i < B; i++) {
		k += __int128(a[i])<<i;
		if((k/x) < (__int128(2)<<i))
			con.push_back(convert(k/x));
	}
	for(auto &i : con) reverse(all(i));
	ll dp[128][128];
	memset(dp, 0, sizeof dp);
	dp[0][con.size()] = 1;
	for(int i = 0; i < B; i++) {
		for(int j = 0; j <= con.size(); j++) {
			//if(dp[i][j]) cout << i << " " << j << " " << dp[i][j] << endl;
			int tj = j;
			while(tj && con[tj-1][i] == 1) tj--;
			dp[i+1][tj] += dp[i][j];//place 0
			int can1 = 1;
			for(int k = B-i-1; k < j; k++) can1 &= con[k][i] == 1;
			if(can1) dp[i+1][j] += dp[i][j];
		}
	}
	ll ans = 0;
	for(int i = 0; i <= con.size(); i++) ans += dp[B][i];
	return ans;
}

Compilation message (stderr)

biscuits.cpp: In function 'll count_tastiness(ll, std::vector<long long int>)':
biscuits.cpp:26:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |   for(int j = 0; j <= con.size(); j++) {
      |                  ~~^~~~~~~~~~~~~
biscuits.cpp:37:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |  for(int i = 0; i <= con.size(); i++) ans += dp[B][i];
      |                 ~~^~~~~~~~~~~~~

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