Submission #418766

#	Time	Username	Problem	Language	Result	Execution time	Memory
418766		2qbingxuan	Packing Biscuits (IOI20_biscuits)	C++14	42 / 100	1088 ms	38540 KiB

biscuits

#include "biscuits.h"
#include <bits/stdc++.h>
#ifdef local
#define debug(x...) qqbx(#x, x)
template <typename ...T> void qqbx(const char *s, T ...args) {
    int cnt = sizeof...(T);
    ((std::cerr << "\e[1;32m(" << s << ") = (") , ... , (std::cerr << args << (--cnt ? ", " : ")\e[0m\n")));
}
#else
#define debug(...) ((void)0)
#endif
using namespace std;

const int maxn = 65;
long long suf[maxn];
unordered_map<long long, long long> dp[maxn];
int cnt = 0;
long long dfs(vector<long long> &a, long long x, int i, long long carry) {
    if (i == a.size()) {
        return carry / x + 1;
    }
    ++cnt;
    if (dp[i].count(carry))
        return dp[i][carry];
    long long &res = dp[i][carry];
    carry += a[i];
    if (carry + suf[i] < x)
        return res = 1;
    res += dfs(a, x, i+1, carry / 2); // y >> i & 1 == 0
    if (carry >= x)
        res += dfs(a, x, i+1, (carry - x) / 2);
    return res;
}
long long count_tastiness(long long x, std::vector<long long> a) {
    for (int i = 0; i < a.size(); i++) dp[i].clear();
    for (int i = 0; i+1 < a.size(); i++) {
        if (a[i] >= x) {
            long long diff = (a[i] - x) / 2;
            a[i] -= diff * 2;
            a[i+1] += diff;
        }
    }
    for (int i = 0; i < a.size(); i++) {
        suf[i] = 0;
        for (int j = i+1; j < a.size(); j++) {
            suf[i] += a[j] << (j - i);
        }
    }
    long long res = dfs(a, x, 0, 0);
    return res;
}

Compilation message (stderr)

biscuits.cpp: In function 'long long int dfs(std::vector<long long int>&, long long int, int, long long int)':
biscuits.cpp:19:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |     if (i == a.size()) {
      |         ~~^~~~~~~~~~~
biscuits.cpp: In function 'long long int count_tastiness(long long int, std::vector<long long int>)':
biscuits.cpp:35:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |     for (int i = 0; i < a.size(); i++) dp[i].clear();
      |                     ~~^~~~~~~~~~
biscuits.cpp:36:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |     for (int i = 0; i+1 < a.size(); i++) {
      |                     ~~~~^~~~~~~~~~
biscuits.cpp:43:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |     for (int i = 0; i < a.size(); i++) {
      |                     ~~^~~~~~~~~~
biscuits.cpp:45:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |         for (int j = i+1; j < a.size(); j++) {
      |                           ~~^~~~~~~~~~

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