Given a sorted array of distinct integers and a target value, return the index if the target is found. If not, return the index where it would be if it were inserted in order.
You must write an algorithm with O(log n) runtime complexity.
public class Solution {
public int SearchInsert(int[] nums, int target) {
for(int i=0;i<=nums.Length-1;i++)
{
if(target<=nums[i])
{
return i;
}
}
return nums.Length;
}
}
成功是成功了,但其時間複雜度卻是 O(n),達不到題目的要求
方案1 – 二分搜尋法(Binary Search)
public class Solution {
public int SearchInsert(int[] nums, int target) {
int left = 0;
int right = nums.Length - 1;
while (left <= right) {
int mid = left + (right - left) / 2;
if (nums[mid] == target) {
return mid;
}
else if (nums[mid] < target) {
left = mid + 1;
}
else {
right = mid - 1;
}
}
return left;
}
}
因為該陣列已經被排序過了,故用二分搜尋法,可以簡單的一次縮減一半的範圍
故擁有極高的效率 (時間複雜度)
Java解決方案
方案1
class Solution {
public int searchInsert(int[] nums, int target) {
int left = 0;
int right = nums.length - 1;
while (left <= right) {
int mid = left + (right - left) / 2;
if (nums[mid] == target) {
return mid;
}
else if (nums[mid] < target) {
left = mid + 1;
}
else {
right = mid - 1;
}
}
return left;
}
}
運行時間 : 0ms、0ms、0ms
Python3 解決方案
方案1
class Solution:
def searchInsert(self, nums: List[int], target: int) -> int:
left = 0
right = len(nums) - 1
while left <= right:
mid = left + (right - left) // 2
if nums[mid] == target:
return mid
elif nums[mid] < target:
left = mid + 1
else:
right = mid - 1
return left
JavaScript 解決方案
方案1
/**
* @param {number[]} nums
* @param {number} target
* @return {number}
*/
var searchInsert = function(nums, target) {
let left = 0;
let right = nums.length - 1;
while (left <= right) {
let mid = Math.floor(left + (right - left) / 2);
if (nums[mid] === target) {
return mid;
}
else if (nums[mid] < target) {
left = mid + 1;
}
else {
right = mid - 1;
}
}
return left;
};
var uagb_data = {"ajax_url":"https:\/\/zyrastory.com\/wp-admin\/admin-ajax.php","uagb_masonry_ajax_nonce":"f8dc3568e5"};
var uagb_data = {"ajax_url":"https:\/\/zyrastory.com\/wp-admin\/admin-ajax.php","uagb_masonry_ajax_nonce":"f8dc3568e5","uagb_grid_ajax_nonce":"df590a05b6"};
( function() {
let elements = document.querySelectorAll( '.uagb-post-grid.uagb-block-917f9fbf .uagb-post-pagination-wrap a' );
elements.forEach(function(element) {
element.addEventListener("click", function(event){
event.preventDefault();
const link = event.target.getAttribute('href').match( /\/page\/\d+\// )?.[0] || '';
const regex = /\d+/; // regular expression to match a number at the end of the string
const match = link.match( regex ) ? link.match( regex )[0] : 1; // match the regular expression with the link
const pageNumber = parseInt( match ); // extract the number and parse it to an integer
window.UAGBPostGrid._callAjax({"btnBorderTopWidth":1,"btnBorderLeftWidth":1,"btnBorderRightWidth":1,"btnBorderBottomWidth":1,"btnBorderTopLeftRadius":30,"btnBorderTopRightRadius":30,"btnBorderBottomLeftRadius":30,"btnBorderBottomRightRadius":30,"btnBorderStyle":"none","overallBorderColor":"","block_id":"917f9fbf","categories":"6","displayPostExcerpt":false,"displayPostComment":false,"displayPostImage":false,"imgSize":"medium","linkBox":false,"align":"center","orderBy":"rand","excludeCurrentPost":true,"postPagination":true,"pageLimit":0,"imageRatio":"2-3","imgEqualHeight":true,"UAGHideMob":true,"UAGHideTab":true,"UAGResponsiveConditions":true,"btnBorderLink":true,"btnBorderRadiusLink":true,"overallBorderLink":true,"overallBorderRadiusLink":true,"inheritFromTheme":true,"postType":"post","postDisplaytext":"No post found!","taxonomyType":"category","postsToShow":6,"enableOffset":false,"postsOffset":0,"displayPostDate":true,"excerptLength":15,"displayPostAuthor":false,"displayPostTitle":true,"displayPostTaxonomy":false,"hideTaxonomyIcon":true,"taxStyle":"default","displayPostTaxonomyAboveTitle":"withMeta","imgPosition":"top","bgOverlayColor":"#000000","overlayOpacity":"50","displayPostLink":true,"newTab":false,"ctaText":"Read More","btnHPadding":"","btnVPadding":"","columns":3,"tcolumns":2,"mcolumns":1,"width":"wide","order":"desc","rowGap":20,"rowGapTablet":20,"rowGapMobile":20,"columnGap":20,"bgType":"color","bgColor":"#f6f6f6","titleTag":"h4","titleFontSize":"","titleFontSizeType":"px","titleFontFamily":"","titleLineHeightType":"em","titleLoadGoogleFonts":false,"metaColor":"","highlightedTextColor":"#fff","highlightedTextBgColor":"#3182ce","metaFontSize":"","metaFontSizeType":"px","metaFontFamily":"","metaLineHeightType":"em","metaLoadGoogleFonts":false,"excerptColor":"","excerptFontSize":"","excerptFontSizeType":"px","excerptFontFamily":"","excerptLineHeightType":"em","excerptLoadGoogleFonts":false,"displayPostContentRadio":"excerpt","ctaBgType":"color","ctaBgHType":"color","ctaFontSize":"","ctaFontSizeType":"px","ctaFontFamily":"","ctaLineHeightType":"em","ctaLoadGoogleFonts":false,"paddingTop":20,"paddingBottom":20,"paddingRight":20,"paddingLeft":20,"contentPadding":20,"ctaBottomSpace":0,"ctaBottomSpaceTablet":0,"ctaBottomSpaceMobile":0,"imageBottomSpace":15,"titleBottomSpace":15,"metaBottomSpace":15,"excerptBottomSpace":25,"contentPaddingUnit":"px","rowGapUnit":"px","columnGapUnit":"px","excerptBottomSpaceUnit":"px","paginationSpacingUnit":"px","imageBottomSpaceUnit":"px","titleBottomSpaceUnit":"px","metaBottomSpaceUnit":"px","ctaBottomSpaceUnit":"px","paddingBtnUnit":"px","mobilePaddingBtnUnit":"px","tabletPaddingBtnUnit":"px","paddingUnit":"px","mobilePaddingUnit":"px","tabletPaddingUnit":"px","isPreview":false,"taxDivider":", ","titleLetterSpacing":"","titleLetterSpacingType":"px","metaLetterSpacing":"","metaLetterSpacingType":"px","ctaLetterSpacing":"","ctaLetterSpacingType":"px","excerptLetterSpacing":"","excerptLetterSpacingType":"px","useSeparateBoxShadows":true,"boxShadowColor":"#00000070","boxShadowHOffset":0,"boxShadowVOffset":0,"boxShadowBlur":"","boxShadowSpread":"","boxShadowPosition":"outset","boxShadowColorHover":"","boxShadowHOffsetHover":0,"boxShadowVOffsetHover":0,"boxShadowBlurHover":"","boxShadowSpreadHover":"","boxShadowPositionHover":"outset","borderWidth":"","borderStyle":"none","borderColor":"","borderRadius":"","blockName":"post-grid","equalHeight":true,"paginationBgActiveColor":"#e4e4e4","paginationActiveColor":"#333333","paginationBgColor":"#e4e4e4","paginationColor":"#777777","paginationMarkup":"","paginationLayout":"filled","paginationBorderColor":"#888686","paginationBorderSize":1,"paginationSpacing":20,"paginationAlignment":"left","paginationPrevText":"\u00ab Previous","paginationNextText":"Next \u00bb","layoutConfig":[["uagb\/post-image"],["uagb\/post-taxonomy"],["uagb\/post-title"],["uagb\/post-meta"],["uagb\/post-excerpt"],["uagb\/post-button"]],"post_type":"grid","equalHeightInlineButtons":false,"paginationType":"ajax","extended_widget_opts_block":{},"extended_widget_opts":{},"extended_widget_opts_state":"","extended_widget_opts_clientid":"","dateUpdated":""}, pageNumber, '917f9fbf');
});
});
} )();
ai_front = {"insertion_before":"BEFORE","insertion_after":"AFTER","insertion_prepend":"PREPEND CONTENT","insertion_append":"APPEND CONTENT","insertion_replace_content":"REPLACE CONTENT","insertion_replace_element":"REPLACE ELEMENT","visible":"VISIBLE","hidden":"HIDDEN","fallback":"FALLBACK","automatically_placed":"Automatically placed by AdSense Auto ads code","cancel":"Cancel","use":"Use","add":"Add","parent":"Parent","cancel_element_selection":"Cancel element selection","select_parent_element":"Select parent element","css_selector":"CSS selector","use_current_selector":"Use current selector","element":"ELEMENT","path":"PATH","selector":"SELECTOR"};