색종이 만들기
https://www.acmicpc.net/problem/2630
| 시간 제한 | 메모리 제한 | 제출 | 정답 | 맞힌 사람 | 정답 비율 |
|---|---|---|---|---|---|
| 1 초 | 128 MB | 30228 | 20612 | 16378 | 68.754% |
문제
아래 <그림 1>과 같이 여러개의 정사각형칸들로 이루어진 정사각형 모양의 종이가 주어져 있고,
각 정사각형들은 하얀색으로 칠해져 있거나 파란색으로 칠해져 있다.
주어진 종이를 일정한 규칙에 따라 잘라서 다양한 크기를 가진 정사각형 모양의 하얀색 또는 파란색 색종이를 만들려고 한다.
전체 종이의 크기가 N×N(N=2k, k는 1 이상 7 이하의 자연수) 이라면 종이를 자르는 규칙은 다음과 같다.
전체 종이가 모두 같은 색으로 칠해져 있지 않으면 가로와 세로로 중간 부분을 잘라서
<그림 2>의 I, II, III, IV와 같이 똑같은 크기의 네 개의 N/2 × N/2색종이로 나눈다.
나누어진 종이 I, II, III, IV 각각에 대해서도 앞에서와 마찬가지로
모두 같은 색으로 칠해져 있지 않으면 같은 방법으로 똑같은 크기의 네 개의 색종이로 나눈다.
이와 같은 과정을 잘라진 종이가 모두 하얀색 또는 모두 파란색으로 칠해져 있거나,
하나의 정사각형 칸이 되어 더 이상 자를 수 없을 때까지 반복한다.
위와 같은 규칙에 따라 잘랐을 때 <그림 3>은 <그림 1>의 종이를 처음 나눈 후의 상태를,
<그림 4>는 두 번째 나눈 후의 상태를,
<그림 5>는 최종적으로 만들어진 다양한 크기의 9장의 하얀색 색종이와 7장의 파란색 색종이를 보여주고 있다.
입력으로 주어진 종이의 한 변의 길이 N과 각 정사각형칸의 색(하얀색 또는 파란색)이 주어질 때
잘라진 하얀색 색종이와 파란색 색종이의 개수를 구하는 프로그램을 작성하시오.
입력
첫째 줄에는 전체 종이의 한 변의 길이 N이 주어져 있다. N은 2, 4, 8, 16, 32, 64, 128 중 하나이다.
색종이의 각 가로줄의 정사각형칸들의 색이 윗줄부터 차례로 둘째 줄부터 마지막 줄까지 주어진다.
하얀색으로 칠해진 칸은 0, 파란색으로 칠해진 칸은 1로 주어지며, 각 숫자 사이에는 빈칸이 하나씩 있다.
출력
첫째 줄에는 잘라진 햐얀색 색종이의 개수를 출력하고, 둘째 줄에는 파란색 색종이의 개수를 출력한다.
예제 입력 1
8 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 0 0 0 0 1 1 0 0 0 0 0 0 1 1 0 0 1 0 0 0 1 1 1 1 0 1 0 0 1 1 1 1 0 0 1 1 1 1 1 1 0 0 1 1 1 1 1 1
예제 출력 1
9 7
예제 입력 A
2 1 1 1 1
예제 출력 A
0 1
예제 입력 B
2 0 0 0 0
예제 출력 B
1 0
예제 입력 C
4 1 0 1 0 0 0 0 0 1 0 1 0 0 0 0 0
예제 출력 C
12 4
예제 입력 D
128 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 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예제 출력 D
48 532
출처
Olympiad > 한국정보올림피아드 > KOI 2001 > 중등부 1번
- 잘못된 데이터를 찾은 사람: choiking10
- 문제의 오타를 찾은 사람: shoark7
- 데이터를 추가한 사람: troas96
알고리즘 분류
통과된 코드
재귀를 이용한 분할 정복으로 해결하였습니다.
#include <iostream>
using namespace std;
// 범위는 2^7 = 128
constexpr int MAX = 129;
int N;
// 0 - white, 1 - bule
int result[2];
int map[MAX][MAX];
// (넓이, 시작 x 좌표 , 시작 y 좌표)
void DivideAndConquer(int w, int x, int y)
{
if (w == 1) {
// 넓이가 1이면 해당 시작점 색의 색종이
result[map[x][y]]++;
return;
}
int check = 0;
for (int i = 0; i < w; i++) {
for (int j = 0; j < w; j++) {
check += map[x + i][y + j];
// 범위를 다 더해서 0 이면 하얀색 색종이
// W * W 이면 파란색 색종이
}
}
if (check == 0) {
result[0]++; // 하얀색 색종이 추가
}
else if (check == w * w) {
result[1]++; // 파란색 색종이 추가
}
else { // 분할 정복
DivideAndConquer(w / 2, x , y );
DivideAndConquer(w / 2, x + w / 2, y );
DivideAndConquer(w / 2, x , y + w / 2);
DivideAndConquer(w / 2, x + w / 2, y + w / 2);
}
}
int main()
{
ios_base::sync_with_stdio(false); // scanf와 동기화를 비활성화
// cin.tie(null); 코드는 cin과 cout의 묶음을 풀어줍니다.
cin.tie(NULL);
cout.tie(NULL);
cin >> N;
for (int i = 1; i <= N; i++){
for (int j = 1; j <= N; j++) {
cin >> map[i][j];
}
}
// 분할 정복
DivideAndConquer(N, 1, 1);
// 결과 출력
cout << result[0] << "\n" << result[1];
return 0;
}
배열 범위의 최댓값을 128로 설정하여 틀렸다.
![백준 9471번 (피사노 주기, C++) [BAEKJOON]](https://lycos7560.com/wp-content/uploads/boj-og.png)
![백준 14500번 (테트로미노, C++) / 추가 반례 [BAEKJOON]](https://lycos7560.com/wp-content/uploads/2022/10/boj-og-1-2048x1070-1-1024x535.png)