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ThreeSumClosest.java
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32 lines (30 loc) · 950 Bytes
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import java.util.Arrays;
public class ThreeSumClosest {
public static int threeSumClosest(int[] nums, int target) {
if (nums == null || nums.length < 3) {
throw new IllegalArgumentException();
}
Arrays.sort(nums);
final int sz = nums.length;
int res = nums[0] + nums[1] + nums[2];
for (int i = 0; i < sz; i++) {
if (i > 0 && nums[i] == nums[i - 1]) {
continue;
}
int lo = i + 1, hi = sz - 1;
while (lo < hi) {
int sum = nums[i] + nums[lo] + nums[hi];
if (sum == target) {
return sum;
}
res = Math.abs(res - target) < Math.abs(sum - target) ? res : sum;
if (sum < target) {
lo++;
} else {
hi--;
}
}
}
return res;
}
}