Submission #829102

#	Time	Username	Problem	Language	Result	Execution time	Memory
829102		definitelynotmee	Packing Biscuits (IOI20_biscuits)	C++17	21 / 100	1088 ms	52388 KiB

biscuits

#include "biscuits.h"
//#include"grader.cpp"
#include<bits/stdc++.h>
#define ff first
#define ss second
#define all(x) x.begin(), x.end()
using namespace std;
using ll = long long;
using pii = pair<int,int>;
const ll INFL = numeric_limits<ll>::max();

vector<ll> ct, v, ub;

ll solve(int id, ll carry, ll x){
	if(id == -1)
		return 1;
	if(ub[id] < carry)
		return 1;
	
	ll minus = min(v[id], carry);
	carry-=minus;
	ll ret = solve(id-1,carry*2,x);
	// cerr << id << ' ' << carry << ' ' << x << endl;
	// cerr << "->" << carry+x << ' ' << ct[id] << ' ' << minus << endl;
	if(carry+x <= ct[id]-minus)
		ret += solve(id-1, (max(0ll, x+carry+minus-v[id]))*2, x);
	return ret;
}

bool solvetest(int id, ll carry, ll x){
	if(id == -1)
		return false;
	
	ll minus = min(v[id], carry);
	carry-=minus;
	ll ret = solve(id-1,carry*2,x);
	if(carry+x <= ct[id]-minus)
		return true;
	return ret;
}

void bsearch(int id, ll x){
	ll ini = -1, fim = 1000000000000000000;
	// cerr << id << ' ' <<fim << endl;
	while(ini!=fim){
		// cerr << ini << ' ' << fim << '\n';
		ll m = (ini+fim+1)>>1;
		if(solvetest(id,m,x))
			ini = m;
		else fim = m-1;
	}
	ub[id] = ini;
}

long long count_tastiness(long long x, std::vector<long long> a) {
	a.resize(60,0);
	ct = v = a;
	int k = a.size();

	
	map<ll,ll> dp;

	auto getdp =[&](ll vi, ll carry){
		return dp.lower_bound(2*(carry-vi))->ss + dp.lower_bound(2*(carry+x-vi))->ss;
	};

	dp[0] = 1;
	dp[INFL] = 0;

	auto dc =[&](ll l, ll r, ll respl, ll respr, ll vi, map<ll,ll> & newdp, auto dc) -> void {
		if(l > r || respl == respr)
			return;
		ll m = (l+r)>>1;

		newdp[m] = getdp(vi,m);

		dc(l,m-1,respl,newdp[m],vi,newdp,dc);
		dc(m+1,r,newdp[m],respr,vi,newdp,dc);
	};

	for(int i = 0; i < 60; i++){
		map<ll,ll> newdp;
		newdp[0] = getdp(v[i],0);
		newdp[INFL] = 0;

		dc(1,4e18, newdp[0], 0, v[i], newdp, dc);

		dp.swap(newdp);
	}
	return dp[0];

}

Compilation message (stderr)

biscuits.cpp: In function 'long long int count_tastiness(long long int, std::vector<long long int>)':
biscuits.cpp:58:6: warning: unused variable 'k' [-Wunused-variable]
   58 |  int k = a.size();
      |      ^

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