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30 lines (28 loc) · 730 Bytes
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package leetcode.hard;
public class P_41 {
public int firstMissingPositive(int[] nums) {
final int n = nums.length;
final int outOfRange = n + 1;
for (int i = 0; i < n; i++) {
if (nums[i] <= 0) {
nums[i] = outOfRange;
}
}
for (int i = 0; i < n; i++) {
int num = Math.abs(nums[i]);
if (num >= outOfRange) {
continue;
}
num--;
if (nums[num] > 0) {
nums[num] = -nums[num];
}
}
for (int i = 0; i < n; i++) {
if (nums[i] > 0) {
return i + 1;
}
}
return outOfRange;
}
}