Submission #714377

#	Time	Username	Problem	Language	Result	Execution time	Memory
714377		josanneo22	드문 곤충 (IOI22_insects)	C++17	50 / 100	199 ms	428 KiB

insects

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

#define ll long long
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define watch(x) cout << (#x) << " = " << x << '\n'
#define boost ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)

using namespace std;
const int nax = 2e3 + 5;
const int MOD = 1e9 + 7;

int pref[nax];
int min_cardinality(int n) {
    int type = 0;
    vector<int> need;
    for (int i = 0; i < n; ++i)
    {
        move_inside(i);
        int a = press_button();
        if (a == 1) {
            type++;
            need.push_back(i);
        }
        else move_outside(i);
        pref[i] = type;
    }
    for (int i = 0; i < need.size(); ++i)
    {
        move_outside(need[i]);
    }
    int l = 1, r = n / type + 1, ans = 0;
    vector<int> cur, vis(n);
    while (l < r) {
        int md = (l + r) / 2;
        for (int i = 0; i < n; ++i) {
            if (vis[i]) continue;
            move_inside(i);
            int a = press_button();
            if (a > md) {
                move_outside(i);
            }
            else {
                cur.push_back(i);
            }
        }
        if (type * md == cur.size()) {
            for (auto x : cur) vis[x] = 1;
            l = md + 1; ans = md;
        }
        else {
            r = md;
            vector<int> nw;
            for (auto i : cur)
            {
                if (vis[i]) {
                    nw.push_back(i);
                    continue;
                }
                move_outside(i);
            }
            cur.clear();
            for (auto x : nw)
                cur.push_back(x);
        }
    }
    return ans;
}

Compilation message (stderr)

insects.cpp: In function 'int min_cardinality(int)':
insects.cpp:29:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |     for (int i = 0; i < need.size(); ++i)
      |                     ~~^~~~~~~~~~~~~
insects.cpp:48:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   48 |         if (type * md == cur.size()) {
      |             ~~~~~~~~~~^~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 25 / 75