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SearchRange.java
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56 lines (54 loc) · 1.39 KB
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public class SearchRange {
public int[] searchRange(int[] A, int x) {
int[] ans = {-1, -1};
int left = 0, right = A.length -1;
while(left <= right){
int mid = (left +right)/ 2;
if(A[mid] < x- 0.5){
left = mid +1;
}else{
right = mid-1;
}
}
if(left>= A.length || A[left] != x) return ans;
ans[0] = left;
right = A.length -1;
while(left <= right){
int mid = (left + right)/ 2;
if(A[mid] < x + 0.5){
left = mid +1;
}else{
right = mid -1;
}
}
ans[1] = left -1;
return ans;
}
/*
public int[] searchRange(int[] A, int x) {
int[] ans = {-1, -1};
int left = 0, right = A.length -1;
while(left < right){
int mid = (left +right)/ 2;
if(A[mid] < x){
left = mid +1;
}else{
right = mid;
}
}
if(A[left] != x) return ans;
ans[0] = left;
right = A.length;
while(left < right){
int mid = (left + right)/ 2;
if(A[mid] <= x){
left = mid +1;
}else{
right = mid;
}
}
ans[1] = right -1;
return ans;
}
*/
}