Submission #304989

#	Time	Username	Problem	Language	Result	Execution time	Memory
304989		MarcoMeijer	Packing Biscuits (IOI20_biscuits)	C++14	100 / 100	15 ms	896 KiB

biscuits

#include "biscuits.h"
#include <bits/stdc++.h>
using namespace std;
 
// macros
typedef long long ll;
typedef long double ld;
typedef pair<int, int> ii;
typedef pair<ll, ll> lll;
typedef tuple<int, int, int> iii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<iii> viii;
typedef vector<ll> vll;
typedef vector<lll> vlll;
#define REP(a,b,c) for(int a=int(b); a<int(c); a++)
#define RE(a,c) REP(a,0,c)
#define RE1(a,c) REP(a,1,c+1)
#define REI(a,b,c) REP(a,b,c+1)
#define REV(a,b,c) for(int a=int(c-1); a>=int(b); a--)
#define FOR(a,b) for(auto& a : b)
#define all(a) a.begin(), a.end()
#define INF 1e9
#define EPS 1e-9
#define pb push_back
#define popb pop_back
#define fi first
#define se second
#define sz size()

ll count_tastiness(ll x, vll a) { 
    while(a.size()<60) a.pb(0);
    vll b; b=a;
    REP(i,1,60) b[i]+=b[i-1]/2;
    
    vll dp; dp.assign(61,0);
    dp[0] = 1;
    
    RE(i,60) {
        if(b[i]<x) {
            dp[i+1] = dp[i];
            continue;
        }
        ll add=0, needed=max(0ll, x-a[i])*2ll;
        REV(j,1,i+1) {
            if(b[j-1] >= needed+x) add += dp[j-1], needed = max(0ll, needed+x-a[j-1])*2ll;
            else needed = max(0ll, needed-a[j-1])*2ll;
        }
        if(needed == 0) add++;
        dp[i+1] = dp[i]+add;
    }
	return dp[60];
}

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