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861.java
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861.java
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__________________________________________________________________________________________________
sample 0 ms submission
class Solution {
public int matrixScore(int[][] A) {
// flip the rows first
for (int i = 0; i < A.length; i++) {
if (A[i][0] == 0) {
for (int j = 0; j < A[i].length; j++) {
if (A[i][j] == 0) {
A[i][j] = 1;
} else {
A[i][j] = 0;
}
}
}
}
// now all rows begin with 1, we can deal with columns
for (int i = 1; i < A[0].length; i++) {
int numOnes = 0;
for (int j = 0; j < A.length; j++) {
if (A[j][i] == 1) {
numOnes++;
}
}
if (numOnes * 2 < A.length) {
for (int j = 0; j < A.length; j++) {
if (A[j][i] == 1) {
A[j][i] = 0;
} else {
A[j][i] = 1;
}
}
}
}
// calculate the sum
int sum = 0;
for (int i = 0; i < A.length; i++) {
int num = 0;
for (int j = 0; j < A[i].length; j++) {
num += A[i][j];
num = num << 1;
}
num = num >> 1;
sum += num;
}
return sum;
}
}
__________________________________________________________________________________________________
sample 37720 kb submission
class Solution {
public int matrixScore(int[][] A) {
for(int i=0; i<A.length; i++){
if(A[i][0] == 0){
A = toggleRow(A, i);
}
}
for(int i=0; i<A[0].length; i++){
if(countOnesInCol(A, i) < (double)A.length/2){
A = toggleCol(A, i);
}
}
int score = 0;
for(int i=0; i<A.length; i++){
score += intArrToInt(A[i]);
}
return score;
}
public int[][] toggleCol(int[][] A, int colNum){
for(int i=0; i<A.length; i++){
A[i][colNum] = A[i][colNum] ^ 1;
}
return A;
}
public int[][] toggleRow(int[][] A, int rowNum){
for(int i=0; i<A[rowNum].length; i++){
A[rowNum][i] = A[rowNum][i] ^ 1;
}
return A;
}
public int countOnesInCol(int[][] A, int colNum){
int count = 0;
for(int i=0; i<A.length; i++){
if(A[i][colNum] == 1){
count++;
}
}
return count;
}
public int intArrToInt(int[] nums){
StringBuilder strNum = new StringBuilder();
for (int num : nums)
{
strNum.append(num);
}
return Integer.parseInt(strNum.toString(), 2);
}
}
__________________________________________________________________________________________________