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leetcode_java/src/main/java/LeetCodeJava/Array/SetMatrixZeroes.java
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| @@ -0,0 +1,87 @@ | ||
| package LeetCodeJava.Array; | ||
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| // https://leetcode.com/problems/set-matrix-zeroes/description/ | ||
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| public class SetMatrixZeroes { | ||
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| // V0 | ||
| // IDEA : ARRAY OP | ||
| // TODO: implement below | ||
| // https://github.com/yennanliu/CS_basics/blob/master/leetcode_python/Array/set-matrix-zeroes.py | ||
| public void setZeroes(int[][] matrix) { | ||
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| } | ||
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| // V1 | ||
| public void setZeroes_1(int[][] matrix) { | ||
| boolean fr = false,fc = false; | ||
| for(int i = 0; i < matrix.length; i++) { | ||
| for(int j = 0; j < matrix[0].length; j++) { | ||
| if(matrix[i][j] == 0) { | ||
| if(i == 0) fr = true; | ||
| if(j == 0) fc = true; | ||
| matrix[0][j] = 0; | ||
| matrix[i][0] = 0; | ||
| } | ||
| } | ||
| } | ||
| for(int i = 1; i < matrix.length; i++) { | ||
| for(int j = 1; j < matrix[0].length; j++) { | ||
| if(matrix[i][0] == 0 || matrix[0][j] == 0) { | ||
| matrix[i][j] = 0; | ||
| }} | ||
| } | ||
| if(fr) { | ||
| for(int j = 0; j < matrix[0].length; j++) { | ||
| matrix[0][j] = 0; | ||
| } | ||
| } | ||
| if(fc) { | ||
| for(int i = 0; i < matrix.length; i++) { | ||
| matrix[i][0] = 0; | ||
| } | ||
| } | ||
| } | ||
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| // V2 | ||
| // https://leetcode.com/problems/set-matrix-zeroes/solutions/4800467/using-2-d-boolean-array/ | ||
| public void setZeroes_2(int[][] matrix) { | ||
| int rows = matrix.length; | ||
| int cols = matrix[0].length; | ||
| boolean[][] isOriginalZero = new boolean[rows][cols]; | ||
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| for(int i=0;i<rows;i++){ | ||
| for(int j=0;j<cols;j++){ | ||
| if(matrix[i][j] == 0) | ||
| isOriginalZero[i][j] = true; | ||
| else | ||
| continue; | ||
| } | ||
| } | ||
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| for(int i=0;i<rows;i++){ | ||
| for(int j=0;j<cols;j++){ | ||
| int currRow = i; | ||
| int currCol = j; | ||
| if(matrix[currRow][currCol]==0 && isOriginalZero[currRow][currCol]){ | ||
| for(int c=0;c<currCol;c++){ | ||
| matrix[currRow][c] = 0; | ||
| } | ||
| for(int c=currCol;c<cols;c++){ | ||
| matrix[currRow][c] = 0; | ||
| } | ||
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| for(int r=0;r<currRow;r++){ | ||
| matrix[r][currCol] = 0; | ||
| } | ||
| for(int r=currRow;r<rows;r++){ | ||
| matrix[r][currCol] = 0; | ||
| } | ||
| } | ||
| else | ||
| continue; | ||
| } | ||
| } | ||
| } | ||
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| } |