Submission #802575

#	Time	Username	Problem	Language	Result	Execution time	Memory
802575		I_Love_EliskaM_	Packing Biscuits (IOI20_biscuits)	C++14	12 / 100	1088 ms	1020 KiB

biscuits

#include "biscuits.h"
#include <bits/stdc++.h>
using namespace std;
#define forn(i,n) for(int i=0;i<n;++i)
#define pb push_back
#define all(x) x.begin(), x.end()
using ll = long long;
#define pi pair<int,int>
#define f first
#define s second

const int N=1e5+5;
bitset<N> bs;

ll p2(ll x, vector<ll> a) {
    while (a.size()<=60) a.pb(0);
    ll s=1;
    int k=0;
    while (k<60 && (a[k]==0 || s>=(1ll<<k))) {
        s+=(a[k]<<k);
        ++k;
    }
    ll old=s;
    ll s2=1;
    for (int t=k; t<60; ++t) {
        if (!a[t]) continue;
        if (s2 >= (1ll<<(t-k))) {
            s2+=(a[t]<<(t-k));
        } else {
            s=s2*old;
            old=s;
            s2=1;
            k=t;
            --t;
        }
    }
    s=s2*old;
    old=s;
    s2=1;
    return s;
}

#define int ll
ll f(ll x, vector<pi>&a, int i) {
    if (!a.size()) return 0;
    if (i>=a.size()-1) return 1+(a[i].f/x);
    if (a[i].f>=x) {
        a[i+1].f+=(a[i].f-x)>>(a[i+1].s-a[i].s);
        ll q1=f(x,a,i+1);
        a[i+1].f-=(a[i].f-x)>>(a[i+1].s-a[i].s);
        a[i+1].f+=(a[i].f)>>(a[i+1].s-a[i].s);
        ll q2=f(x,a,i+1);
        a[i+1].f-=(a[i].f)>>(a[i+1].s-a[i].s);
        return q1+q2;
    } else {
        a[i+1].f+=(a[i].f)>>(a[i+1].s-a[i].s);
        ll q=f(x,a,i+1);
        a[i+1].f-=(a[i].f)>>(a[i+1].s-a[i].s);
        return q;
    }
}

ll count_tastiness(ll x, vector<ll> a) {
    
    if (x==1) {
        return p2(x,a);
    }
    vector<pi> v;
    forn(i,a.size()) if (a[i]) v.pb({a[i],i});
    return f(x,v,0);

}
#undef int

Compilation message (stderr)

biscuits.cpp: In function 'll first(ll, std::vector<std::pair<long long int, long long int> >&, ll)':
biscuits.cpp:46:10: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   46 |     if (i>=a.size()-1) return 1+(a[i].f/x);
      |         ~^~~~~~~~~~~~
biscuits.cpp: In function 'll count_tastiness(ll, std::vector<long long int>)':
biscuits.cpp:4:32: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    4 | #define forn(i,n) for(int i=0;i<n;++i)
......
   69 |     forn(i,a.size()) if (a[i]) v.pb({a[i],i});
      |          ~~~~~~~~~~             
biscuits.cpp:69:5: note: in expansion of macro 'forn'
   69 |     forn(i,a.size()) if (a[i]) v.pb({a[i],i});
      |     ^~~~

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