글 읽기 - 반례좀 찾아주세요

sungdd2 4년 전 0

질문게시판에 있는 모든 반례는 다 해봤는데 다 정상출력됩니다.

근데 계속 틀렸다고 나오네요.

알고리즘은 dfs로 섬 라벨링 후 bfs로 섬 찾는 방식입니다.

ㅇ

#include<iostream>
#include<queue>
using namespace std;


queue<pair<int, int>> start;
short map[100][100];
bool check[100][100];

int dx[] = { 0,0,1,-1 };
int dy[] = { 1,-1,0,0 };
int input;
int result = 100;
void dfs(int p, int q, int cnt);
int bfs(int p, int q, int group, int cnt);
void set();

int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);

	cin >> input;

	for (int i = 0; i < input; i++) {
		for (int j = 0; j < input; j++) {
			cin >> map[i][j];
			check[i][j] = false;
		}
	}

	int cnt = 1;

	for (int i = 0; i < input; i++) {
		for (int j = 0; j < input; j++) {

			if (map[i][j] == 1 && !check[i][j]) {
				dfs(i,j,cnt);
				cnt++;
			}
		}
	}

	
	int tmp = 0;
	for (int i = 0; i < input; i++) {
		for (int j = 0; j < input; j++) {
			cnt = 0;
			set();
			if (map[i][j] != 0) {
				start.push(make_pair(i, j));
				check[i][j] = true;
				int group = map[i][j];
				int size = 1;
				while (size--) {
					int p = start.front().first;
					int q = start.front().second;
					start.pop();


					if (cnt > result) {
						while (!start.empty())
							start.pop();

						break;
					}

					bfs(p, q, group,cnt);

					if (size == 0) {
						size = start.size();
						cnt++;
					}

				}
			}
		}
		
	}


	cout << result << '\n';

	return 0;
}


void set() {
	for (int i = 0; i < input; i++) {
		for (int j = 0; j < input; j++) {
			check[i][j] = false;
		}
	}

	return;
}

void dfs(int p, int q, int cnt) {
	check[p][q] = true;
	map[p][q] = cnt;
	
	for (int i = 0; i < 4; i++) {
		int nx = dx[i] + p;
		int ny = dy[i] + q;

		if (nx < input && ny < input && 0<=nx && 0<=ny) {
			if (map[nx][ny] == 1 && !check[nx][ny]) {
				dfs(nx, ny, cnt);
			}
		}
	}

	return;
}

int bfs(int p, int q, int group, int cnt) {
	

	for (int i = 0; i < 4; i++) {
		int nx = dx[i] + p;
		int ny = dy[i] + q;

		if (nx < input && ny < input && 0<=nx && 0<=ny) {
			if (map[nx][ny] != 0 && map[nx][ny] != group) {
				if (result > cnt)
					result = cnt;
			}
			else if (map[nx][ny] == 0 && !check[nx][ny]) {
				start.push(make_pair(nx, ny));
				check[nx][ny] = true;
			}
		}
	}

	return 0;
}

nahwasa 4년 전 0

13번째줄이요.

출력값의 최대값은 197입니다.

이하 그에따른 반례입니다.

(정답 : 197 / 출력 : 100)

100
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댓글을 작성하려면 로그인해야 합니다.

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