第十一章模拟 17 AcWing 1595. 螺旋矩阵

雨点打透心脏的1/2处 2024-03-31 13:18 51阅读 0赞

## 第十一章 模拟 17 AcWing 1595. 螺旋矩阵 ##

### 原题链接 ###

[AcWing 1595. 螺旋矩阵][AcWing 1595.]

### 算法标签 ###

模拟

### 思路 ###

使用偏移量法进行模拟

##### 偏移量法 #####

![在这里插入图片描述][0e81eb188b564c6bab172d5e4e59bd12.png]

### 代码 ###

#pragma GCC optimize(2)
    #pragma GCC optimize(3)
    #include<bits/stdc++.h>
    #define int long long
    #define xx first
    #define yy second
    #define ump unordered_map
    #define us unordered_set
    #define pq priority_queue
    #define rep(i, a, b) for(int i=a;i<b;++i)
    #define Rep(i, a, b) for(int i=a;i>=b;--i)
    using namespace std;
    typedef pair<int, int> PII;
    const int N=10005, inf=0x3f3f3f3f3f3f3f3f, mod=1e9+7;
    const double Exp=1e-8;
    int w[N];
    //int t, n, m, cnt, ans;
    inline int rd(){
       int s=0,w=1;
       char ch=getchar();
       while(ch<'0'||ch>'9'){if(ch=='-')w=-1;ch=getchar();}
       while(ch>='0'&&ch<='9') s=s*10+ch-'0',ch=getchar();
       return s*w;
    }
    void put(int x) {
        if(x<0) putchar('-'),x=-x;
        if(x>=10) put(x/10);
        putchar(x%10^48);
    }
    signed main(){
    	ios::sync_with_stdio(false);
    	cin.tie(0);
    	cout.tie(0);
    	int n=rd();
    	rep(i, 0, n){
    	    w[i]=rd();
    	}
    	sort(w, w+n, greater<int>());
    	int r, c;
    	rep(i, 1, n/i+1){
    	    if(!(n%i)){
    	        r=n/i;
    	        c=i;
    	    }
    	}
    	int dx[]={0, 1, 0, -1}, dy[]={1, 0, -1, 0};
    	// 二维动态数组初始化大小
    	vector<vector<int>> res(r, vector<int>(c));
    	for(int i=0, x=0, y=0, d=0; i<n; ++i){
    	    res[x][y]=w[i];
    	    int a=x+dx[d], b=y+dy[d];
    	    if(a>=r||b>=c||a<0||b<0||res[a][b]){
    	        d=(d+1)%4;
    	        a=x+dx[d], b=y+dy[d];
    	    }
    	    x=a, y=b;
    	}
    	rep(i, 0, r){
    	    printf("%lld", res[i][0]);
    	    rep(j, 1, c){
    	        printf(" %lld", res[i][j]);    
    	    }
    	    puts("");
    	}
    	return 0;
    }

### 参考文献 ###

[AcWing 1595. 螺旋矩阵（PAT甲级辅导课）y总视频讲解][AcWing 1595. _PAT_y]

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![在这里插入图片描述][9cb4cb80a18345158f8a69e2f196e5b9.png]

[AcWing 1595.]: https://www.acwing.com/problem/content/1597/
[0e81eb188b564c6bab172d5e4e59bd12.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/31/2ed9376957584d3f8f222341e0062dd1.png
[AcWing 1595. _PAT_y]: https://www.acwing.com/video/1266/
[9cb4cb80a18345158f8a69e2f196e5b9.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/31/8664063370244754bf906e6975fc7e5b.png