CodingProblems/BitFlip.java at master · PerrySong/CodingProblems · GitHub

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publicclassBitFlip {

publicstaticintbitFlip(int[] array, intlength) {
intleft = 0, right = length - 1;
intres = 0;
while (left <= right) {
while (array[left] == 1) {
left++;
 }

while (array[right] == 1) {
right--;
 }
intcf = countFlip(array, left, right);
res = res > cf ? res : cf;
while (array[left] == 0) {
left++;
 }
while (array[right] == 0) {
right--;
 }
 }

returnres;
 }

privatestaticintcountFlip(int[] array, intleft, intright) {
intcount = 0;
for (inti = 0; i < left; i++) {
if (array[i] == 1) count++;
 }
for (inti = left; i <= right; i++) {
if (array[i] == 0) count++;
 }
for (inti = right + 1; i < array.length; i++) {
if (array[i] == 1) count++;
 }
returncount;
 }

publicstaticvoidmain(String[] args) {
System.out.println(bitFlip(newint[] {1, 0, 0, 1, 0, 0, 1, 0}, 8));
 }
}