Java for循环没有正确填充数组

时间:2015-07-05 19:18:01

标签: java loops multidimensional-array combinations permutation

我有以下代码:

freq1: {'h': 3, 's': 2, 'f': 1}
freq2: defaultdict(<type 'int'>, {'h': 3, 's': 2, 'f': 1})
freq3: defaultdict(<type 'int'>, {'h': 3, 's': 2, 'f': 1})
freq4: {'h': 3, 's': 2, 'f': 1}

Do all the dictionaries equal each other as they stand?
Answer: True


freq1: {'h': 3, 's': 2, 'f': 1}
freq2: {'h': 3, 's': 2, 'f': 1}
freq3: {'h': 3, 's': 2, 'f': 1}
freq4: {'h': 3, 's': 2, 'f': 1}
[Finished in 0.1s]

循环内的println检查正确地正确报告存储的数据,因为您可以看到是否运行该程序。但是,在循环之后,如果我尝试检索循环内设置的任何值,则所有值= 0.我缺少什么?

在循环中设置,所有值都应该对应于数组第一维的索引:

allsolutions [0] [x] [x] [x] [x] = 0;

allsolutions [1] [x] [x] [x] [x] = 1;

allsolutions [2] [x] [x] [x] [x] = 2;

等等......

4 个答案:

答案 0 :(得分:9)

您永远不会向allsolutions[4][2][1][4][5]或您正在打印的其他4个阵列位置分配任何内容,因此它们保持为0.您的阵列中只有4个嵌套循环和5个维度。

您只能将值分配给第二个索引等于第五个索引的位置。如果您尝试打印,例如System.out.println(allsolutions[4][2][1][4][2]);,则会看到非零值。

您应该使用5个嵌套循环,而不是重复使用j索引:

for(int i=0;i<=15;i++){
    for(int j=0;j<=15;j++){
        for(int k=0;k<=15;k++){
            for(int l=0;l<=15;l++){
              for(int m=0;m<=15;m++){
                allsolutions[i][j][k][l][m] = i;
                System.out.println("Set index "+ i + " " + j + " " + k + " " + l + " " + m + " equal to " + i);
              }
            }
        }
    }
}

答案 1 :(得分:3)

你错过了一个内循环。请尝试以下方法:

RewriteEngine On
#we replace domain.com/$1 with %{SERVER_NAME}%{REQUEST_URI}.
RewriteCond %{HTTP_HOST} !^www\. [NC]
RewriteRule ^(.*) https://www.%{SERVER_NAME}%{REQUEST_URI} [L,R=301]

#here we dont use www as non www was already redirected to www.
RewriteCond %{HTTPS} off
RewriteRule ^(.*) https://%{SERVER_NAME}%{REQUEST_URI} [L,R=301]

问题源于您使用final int DIM = 16; int[][][][][] allsolutions = new int[DIM][DIM][DIM][DIM][DIM]; for (int i = 0; i < DIM; i++){ for (int j = 0; j < DIM; j++) { for (int k = 0; k < DIM; k++) { for (int l = 0; l < DIM; l++){ for (int m = 0; m < DIM; m++) { allsolutions[i][j][k][l][m] = i; System.out.println("Set index " + i + " " + j + " " + k + " " + l + " " + m + " equal to " + i); } } } } } 而不是新变量的最后一个索引,例如j

答案 2 :(得分:0)

您正在重复j,因此在[?][x1][?][?][x2]时您不会填充x1 != x2

如果值取决于索引,为什么不使用函数?

public int getValue(int i, int dc1, int dc2, int dc3, int dc4){
    if (i < 16 && 0 <= i){
        return i;
    }
    // ... throw error or return sentinel value
}

并使用它:

System.out.println(getValue(4,2,1,4,5)); // 4

您可以将其扩展为更复杂的内容,而无需静态存储所有数据。

答案 3 :(得分:0)

它对我有用:

import java.util.Arrays;

public class SolutionsTest {

private static int [][][][] allsolutions; 
//make the arrays static and as a field not local

public static void main (String args[]) {

    allsolutions = new int [16][16][16][16];
    //Initialize the arrays

    for (int i = 0; i < 16;i++) { // The i or index loop
        for (int x = 0; x < 16;x++) { 
            for (int y = 0; y < 16;y++) {
                for (int z = 0; z < 16; z++) {
                    allsolutions[i][x][y][z] = i; //set all as index
                }
            }
        }
    }   

    System.out.println(allsolutions[0][0][0][0]); //prints 0
    System.out.println(allsolutions[1][0][0][0]); //prints 1
    System.out.println(allsolutions[2][0][0][0]); //prints 2
    System.out.println(allsolutions[3][0][0][0]); //prints 3
    System.out.println(allsolutions[0][4][5][5]); //prints 0
    System.out.println(allsolutions[1][8][9][10]); //prints 1
    System.out.println(allsolutions[2][9][10][1]); //prints 2

    System.out.println(Arrays.deepToString(allsolutions)); 
    //prints all arrays

}

}

以下代码输出正确的结果