Submission #308022

#	Time	Username	Problem	Language	Result	Execution time	Memory
308022		Tc14	Counting Mushrooms (IOI20_mushrooms)	C++17	80.14 / 100	9 ms	384 KiB

mushrooms

//#pragma GCC optimize("O3")
#include <bits/stdc++.h>
#include "mushrooms.h"
using namespace std;
#define ve vector
typedef long long ll;
typedef pair<int, int> pii;
const int INF = 1e9 + 10;

int count_mushrooms(int n) {

    int ans, l, x, k, u, v, r, a;
    bool z;
    ve<int> M, A, B, C;

    l = 141;
    x = 2 * l + 1;

    ans = 1;
    A.push_back(0);

    for (int i = 1; i <= 2; i++) {
        if (i >= n) return ans;
        M = {0, i};
        if (use_machine(M) == 0) {
            A.push_back(i);
            ans++;
        }
        else B.push_back(i);
    }

    if (A.size() >= 2) {
        z = false;
        C = A;
    }
    else {
        z = true;
        C = B;
    }

    k = 3;
    while (k < x) {
        if (k >= n) return ans;

        M = {C[0], k, C[1]};
        u = k;
        k++;

        if (k < n) {
            M.push_back(k);
            v = k;
            k++;
        }
        else v = -1;
        
        r = use_machine(M);

        if ((r / 2 == 1) == z) {
            ans++;
            A.push_back(u);
        }
        else B.push_back(u);

        if (v != -1) {
            if ((r % 2 == 1) == z) {
                ans++;
                A.push_back(v);
            }
            else B.push_back(v);
        }
    }

    if (A.size() >= l + 1) {
        z = false;
        C = A;
    }
    else {
        z = true;
        C = B;
    }

    while (k < n) {
        M = {};
        a = 0;
        for (int i = 0; i < l; i++) {
            if (k >= n) break;
            M.push_back(C[i]);
            M.push_back(k);
            k++;
            a++;
        }
        M.push_back(C[a]);

        r = use_machine(M);
        if (z) ans += r / 2;
        else ans += a - (r / 2);
    }

	return ans;
}

Compilation message (stderr)

mushrooms.cpp: In function 'int count_mushrooms(int)':
mushrooms.cpp:73:18: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   73 |     if (A.size() >= l + 1) {
      |         ~~~~~~~~~^~~~~~~~

• Subtask 1: 80.1418 / 100