Submission #726296

#	Time	Username	Problem	Language	Result	Execution time	Memory
726296		Nelt	Rarest Insects (IOI22_insects)	C++17	50.03 / 100	197 ms	444 KiB

insects

#include "insects.h"

#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx,avx2,fma")

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

/* DEFINES */
#define S second
#define F first
#define ll long long
#define ull unsigned long long
#define ld long double
#define npos ULLONG_MAX
#define INF LLONG_MAX
#define vv(a) vector<a>
#define pp(a, b) pair<a, b>
#define pq(a) priority_queue<a>
#define qq(a) queue<a>
#define ss(a) set<a>
#define mm(a, b) map<a, b>
#define ump(a, b) unordered_map<a, b>
#define sync                      \
    ios_base::sync_with_stdio(0); \
    cin.tie(0);                   \
    cout.tie(0);
#define elif else if
#define endl "\n"
#define allc(a) begin(a), end(a)
#define all(a) a, a + sizeof(a) / sizeof(a[0])
#define pb push_back
#define logi(a) __lg(a)
#define sqrt(a) sqrtl(a)
#define mpr make_pair
#define ins insert
using namespace std;
using namespace __gnu_pbds;
using namespace __cxx11;
typedef char chr;
typedef basic_string<chr> str;
template <typename T, typename key = less<T>>
using ordered_set = tree<T, null_type, key, rb_tree_tag, tree_order_statistics_node_update>;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

int min_cardinality(int n)
{
    if (n == 1)
        return 1;
    vv(ll) eq;
    for (ll i = 0; i < n; i++)
    {
        move_inside(i);
        if (press_button() == 2)
            eq.pb(i), move_outside(i);
    }
    ll l = 1, cntdiff = n - eq.size(), r = n / cntdiff, d = cntdiff, cur = cntdiff;
    bool us[n];
    memset(us, 0, sizeof(us));
    while (l <= r)
    {
        ll mid = (l + r) >> 1;
        vv(ll) erase;
        for (ll i : eq)
        {
            if (us[i])
                continue;
            us[i] = 1;
            move_inside(i);
            if (press_button() > mid)
                move_outside(i), us[i] = 0;
            else
                cur++, erase.pb(i);
        }
        if (cur >= mid * cntdiff)
            l = mid + 1;
        else
        {
            r = mid - 1;
            cur -= erase.size();
            for (ll i : erase)
                move_outside(i), us[i] = 0;
        }
    }
    return --l;
}

Compilation message (stderr)

insects.cpp: In function 'int min_cardinality(int)':
insects.cpp:58:57: warning: unused variable 'd' [-Wunused-variable]
   58 |     ll l = 1, cntdiff = n - eq.size(), r = n / cntdiff, d = cntdiff, cur = cntdiff;
      |                                                         ^
In file included from /usr/include/string.h:495,
                 from /usr/include/c++/10/cstring:42,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:48,
                 from insects.cpp:6:
In function 'void* memset(void*, int, size_t)',
    inlined from 'int min_cardinality(int)' at insects.cpp:60:11:
/usr/include/x86_64-linux-gnu/bits/string_fortified.h:71:33: warning: 'void* __builtin_memset(void*, int, long unsigned int)' specified size between 18446744071562067968 and 18446744073709551615 exceeds maximum object size 9223372036854775807 [-Wstringop-overflow=]
   71 |   return __builtin___memset_chk (__dest, __ch, __len, __bos0 (__dest));
      |          ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 25.03 / 75