제출 #759767

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
759767		MilosMilutinovic	Counting Mushrooms (IOI20_mushrooms)	C++14	77.40 / 100	8 ms	344 KiB

mushrooms

#include "mushrooms.h"
#include <bits/stdc++.h>
using namespace std;
const int C = 80;
int count_mushrooms(int n) {
    if (n <= 227) {
        int ans = 1;
        for (int i = 1; i < n; i++) {
            ans += !use_machine({0, i});
        }
        return ans;
    }
    vector<int> a(1, 0), b;
    for (int i = 1; i < min(n, C); i++) {
        if (use_machine({0, i}) == 1)
            b.push_back(i);
        else
            a.push_back(i);
    }
//    printf("%d\n", a.size());
    int ans = a.size();
    for (int i = C; i < n; i++) {
        int sz = max(a.size(), b.size());
        vector<int> qv;
        int cnt = 0;
        for (int j = i; j < min(i + sz, n); j++) {
            if (j != i + sz) {
                if (a.size() == sz)
                    qv.push_back(a[j - i]);
                else
                    qv.push_back(b[j - i]);
                cnt += 1;
            }
            qv.push_back(j);
        }
        int qq = use_machine(qv);
        int diff = (qq + 1) / 2;
        int same = (qv.size() - cnt  - diff);
//        printf("%d\n", diff);
        if (a.size() == sz)
            ans += same;
        else
            ans += diff;
        int is_match = (qq % 2 == 0 ? 1 : 0);
        if (a.size() != sz)
            is_match = 1 - is_match;
        if (is_match)
            a.push_back(qv.back());
        else
            b.push_back(qv.back());
        i = qv.back();
    }
    return ans;
}

컴파일 시 표준 에러 (stderr) 메시지

mushrooms.cpp: In function 'int count_mushrooms(int)':
mushrooms.cpp:28:30: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   28 |                 if (a.size() == sz)
      |                     ~~~~~~~~~^~~~~
mushrooms.cpp:40:22: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   40 |         if (a.size() == sz)
      |             ~~~~~~~~~^~~~~
mushrooms.cpp:45:22: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   45 |         if (a.size() != sz)
      |             ~~~~~~~~~^~~~~

• Subtask 1: 77.3973 / 100