【AcWing】寒假每日一题

最新推荐文章于 2024-01-18 22:30:05 发布

hanwei：）

最新推荐文章于 2024-01-18 22:30:05 发布

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分类专栏：笔记

本文链接：https://blog.youkuaiyun.com/wei2019_/article/details/112709193

week 1

AcWing104.货仓选址

#include <algorithm>

using namespace std;

const int N = 100010;

int n, res;
int a[N];

int main()
{
   
   
    scanf("%d", &n);
    for (int i = 0; i < n; i ++ ) scanf("%d", &a[i]);

    sort(a, a + n);

    for (int i = 0; i < n; i ++ ) res += abs(a[i] - a[n / 2]);
    printf("%d\n", res);

    return 0;
}

week 2

AcWing756.蛇形矩阵

在这里插入图片描述

#include<iostream>

using namespace std;

const int N = 110;

int n, m;
int q[N][N];

int main()
{
   
   
    cin >> n >> m;
    int dx[] = {
   
   -1, 0, 1, 0}, dy[] = {
   
   0, 1, 0, -1};
    int x = 0, y = 0, d = 1;
    for (int i = 1; i <= n * m; i ++)
    {
   
   
        q[x][y] = i;
        int a = x + dx[d], b = y + dy[d];
        if (a < 0 || a >= n || b < 0 || b >= m || q[a][b])
        {
   
   
            d = (d + 1) % 4;
            a = x + dx[d], b = y + dy[d];
        }
        x = a, y = b;  
    }
    for (int i = 0; i < n; i ++)
    {
   
   
        for (int j = 0; j < m; j ++)
            cout << q[i][j] << ' ';
        cout << endl;
    }

    return 0;
}

AcWing1113.红与黑

BFS

#include<iostream>
#include<queue>
#include<algorithm>

#define x first
#define y second

using namespace std;

typedef pair<int, int> PII;
const int N = 25;

int n, m;
char g[N][N];

int bfs(int sx, int sy)
{
   
   
    queue<PII> q;
    q.push({
   
   sx, sy});
    g[sx][sy] = '#';
    int res = 0;

    int dx[] = {
   
   -1, 0, 1, 0}, dy[] = {
   
   0, 1, 0, -1};

    while (q.size())
    {
   
   
        auto t = q.front();
        q.pop();
        res ++ ;

        for (int i = 0; i < 4; i ++)
        {
   
   
            int x = t.x + dx[i], y = t.y + dy[i];
            if (x < 0 || x >= n || y < 0 || y >= m || g[x][y] != '.') continue;
            q.push({
   
   x, y});
            g[x][y] = '#';
        }
    }
    return res;
}

int main()
{
   
   
    while(cin >> m >> n, n || m)
    {
   
   
        for (int i = 0; i < n; i ++) cin >> g[i];
        int x, y;
        for (int i = 0; i < n; i ++)
            for (int j = 0; j < m; j ++)
                if (g[i][j] == '@')
                {
   
   
                    x = i;
                    y = j;
                }
        cout << bfs(x, y) << endl;
    }

    return 0;
}

DFS

#include<iostream>

using namespace std;

const int N = 25;

int n, m;
char g[N][N];

int dfs(int x, int y)
{
   
   
    int res = 1;
    g[x][y] = '#';
    int dx[] = {
   
   -1, 0, 1, 0}, dy[] = {
   
   0, 1, 0, -1};
    
    for (int i = 0; i < 4; i ++)
    {
   
   
        int a = x + dx[i], b = y + dy[i];
        if (a < 0 || a >= n || b < 0 || b >= m || g[a][b] != '.') continue;
        res += dfs(a, b);
    }
    return res;
}

int main()
{
   
   
    while(cin >> m >> n, n || m)
    {
   
   
        for (int i = 0; i < n; i ++) cin >> g[i];
        int x, y;
        for (int i = 0; i < n; i ++)
            for (int j = 0; j < m; j ++)
                if (g[i][j] == '@')
                {
   
   
                    x = i;
                    y = j;
                }
        cout << dfs(x