[英]Replacing rows and columns in a 2d array
我有一個二維數組:
1 0 1 1
1 1 1 1
1 1 1 1
1 1 1 1
我必須編寫一個程序來檢查數組中是否存在0,如果是,則將行和列替換為0,因此它如下所示:
0 0 0 0
1 0 1 1
1 0 1 1
1 0 1 1
到目前為止,這是我的代碼:
public class Run {
public static void main(String[] args){
//defining 2d array
int[][] m = { {1,0,1,1},
{1,1,1,1},
{1,1,1,1},
{1,1,1,1}};
int[][] newArray = zero(m);
//looping through the array to get rows and columns for the array
//rows
for (int i = 0; i < m.length; i++) {
//columns
for (int j = 0; j < m[0].length; j++) {
//check if the integer is the last in the row
if(j== m.length-1){
//print the rows and columns of the array(no space)
System.out.print(newArray[i][j]);
}else{
//print the rows and columns of the array(w/ space)
System.out.print(newArray[i][j] + " ");
}
}
//new line for the new row
System.out.println("");
}
}
//checks if there is a zero in the row
public static int[][] zero(int[][] m) {
//defining row length and column length
int rows = m.length;
int columns = m[0].length;
int[][] tempArray = m;
//looping through the array to get rows and columns
//rows
for (int i = 0; i < rows; i++) {
//columns
for (int j = 0; j < columns; j++) {
//if the number is 0 loop through that row and column again and change everything to 0
if(m[i][j] == 0){
//columns in that row
for(int l = 0; l < rows; l++)
{
tempArray[l][j] = 0;
}
//rows in that column
for(int l = 0; l < columns; l++)
{
tempArray[i][l] = 0;
}
}
}
}
//returning the updated array
return tempArray;
}
}
當我運行我的代碼時,它返回:
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
但是當我取出其中一個時:
//columns in that row
for(int l = 0; l < rows; l++)
{
tempArray[l][j] = 0;
}
要么
//rows in that column
for(int l = 0; l < rows; l++)
{
tempArray[l][j] = 0;
}
它返回:
0 0 0 0
1 1 1 1
1 1 1 1
1 1 1 1
要么
1 0 1 1
1 0 1 1
1 0 1 1
1 0 1 1
問題是線
int[][] tempArray = m;
這使tempArray
和m
成為完全相同的實例 ,因此實際上您只有一個矩陣。
相反,你應該做
int[][] tempArray = new int[rows][columns];
for (int i = 0; i < rows; i++)
for (int j = 0; j < columns; j++)
tempArray[i][j] = m[i][j];
您在循環中檢測到0,然后去修改數據並繼續循環,現在循環將看到更多的零,因此設置了更多的零。
一旦發現0,就應該中斷,或者將檢測與“重寫”分開-先進行所有檢測,然后再進行所有重寫。
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