Submission #315676

#	Time	Username	Problem	Language	Result	Execution time	Memory
315676		Sorting	Packing Biscuits (IOI20_biscuits)	C++17	42 / 100	1049 ms	101172 KiB

biscuits

#include "biscuits.h"
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

ll x, k;
vector<ll> a;

ll count_tastiness(ll _x, vector<ll> _a){
    x = _x, a = _a;
    k = a.size();

    vector<array<ll, 2>> curr, prev;
    prev.push_back({0, 1});
    for(int i = 0; i < k; ++i, swap(curr, prev)){
        ll l = prev[0][0], r = prev.back()[0];
        l += a[i], r += a[i];

        if(l < x){
            if(r >= x) l = 0;
            else l = l / 2;
        }
        else l = (l - x) / 2;
        r = r / 2;

        curr.resize(r - l + 1);
        for(int j = 0; j < r - l + 1; ++j)
            curr[j] = {j + l, 0};

        for(int j = 0; j < prev.size(); ++j){
            ll t = prev[j][0] + a[i];
            curr[t / 2 - l][1] += prev[j][1];
            if(t >= x) curr[(t - x) / 2 - l][1] += prev[j][1]; 
        }
    }

    ll ans = 0;
    for(int i = 0; i < prev.size(); ++i)
        ans += (prev[i][0] / x + 1) * prev[i][1];

    return ans; 
}

Compilation message (stderr)

biscuits.cpp: In function 'll count_tastiness(ll, std::vector<long long int>)':
biscuits.cpp:32:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::array<long long int, 2> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |         for(int j = 0; j < prev.size(); ++j){
      |                        ~~^~~~~~~~~~~~~
biscuits.cpp:40:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::array<long long int, 2> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |     for(int i = 0; i < prev.size(); ++i)
      |                    ~~^~~~~~~~~~~~~

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