수학동아 - 폴리매스

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자유게시판

수학을 주제로 떠들어 보세요!

[잡담] I need help

피카파이 2022.01.10 07:00 조회 289

페이스북 트위터 카카오톡 카카오스토리 네이버블로그 네이버밴드

아니 제가 얼마전에 수학학원을 그만두고 그 교재로 엄마랑 하는데, 그게 답안지가 없어서 엄마도 일일이 구해야 하는데, 둘다 계속 답이 안 맞는게

012344카드로 짝수 네자리수 만들수있는 개수는?

입니다.

도와주세요....

이전글 프사 그려드립니다

다음글 기자님들

추천 0 목록보기

댓글 작성하기

원파 Lv.9 2022.01.10 09:09

코드를 짜봤어요.

#include <bits/stdc++.h>

using namespace std;

#define F first

#define S second

#define rep(i, n) for (int i = 1; i <= n; i++)

#define all(x) (x).begin(), (x).end()

typedef long long ll;

typedef pair<int, int> pi;

const int MAX = (int)1e5 + 5;

multiset<int> ms;

string s; int cnt;

void dfs(int depth)

{

if (depth > 4)

{

if ((s.back() - '0') % 2 == 0 && s[0] != '0')

{

cout << s << '\n';

cnt++;

}



return;

}



vector<int> vc;



auto it = ms.begin();

for (it = ms.begin(); it != ms.end(); it++) vc.push_back(*it);



sort(all(vc)); vc.erase(unique(all(vc)), vc.end());



for (int each : vc)

{

it = ms.lower_bound(each); ms.erase(it);

s += to_string(each);

dfs(depth + 1);

s = s.substr(0, (int)s.size() - 1);

ms.insert(each);

}

}

int main(void)

{

ios_base::sync_with_stdio(false);

cin.tie(NULL); cout.tie(NULL);

cout << fixed; cout.precision(7);



ms.insert(0);

ms.insert(1);

ms.insert(2);

ms.insert(3);

ms.insert(4);

ms.insert(4);



dfs(1);

cout << "\n" << cnt << '\n';



return 0;

}

107개래요.

이런 이런 수들이 있대요.

정확하다고 보장은 못합니다.(???????)

1024

1032

1034

1042

1044

1204

1230

1234

1240

1244

1302

1304

1320

1324

1340

1342

1344

1402

1404

1420

1424

1430

1432

1434

1440

1442

2014

2034

2044

2104

2130

2134

2140

2144

2304

2310

2314

2340

2344

2404

2410

2414

2430

2434

2440

3012

3014

3024

3042

3044

3102

3104

3120

3124

3140

3142

3144

3204

3210

3214

3240

3244

3402

3404

3410

3412

3414

3420

3424

3440

3442

4012

4014

4024

4032

4034

4042

4102

4104

4120

4124

4130

4132

4134

4140

4142

4204

4210

4214

4230

4234

4240

4302

4304

4310

4312

4314

4320

4324

4340

4342

4402

4410

4412

4420

4430

4432

댓글 작성하기 좋아요0 댓글수1
- 피카파이 Lv.8 2022.01.10 17:07
  
  감사합니다. 엄마가 맞았네요.
  
  좋아요0

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