题解 | #两数之和#
两数之和
http://www.nowcoder.com/practice/20ef0972485e41019e39543e8e895b7f
import java.util.*;
public class Solution {
/**
*
* @param numbers int整型一维数组
* @param target int整型
* @return int整型一维数组
*/
public int[] twoSum (int[] numbers, int target) {
// write code here
HashMap<Integer,Integer> map = new HashMap<>();
for(int i=0; i< numbers.length;i++){
if(map.containsKey(target-numbers[i])){
return new int[]{map.get(target-numbers[i])+1,i+1};
}
map.put(numbers[i],i);
}
return null;
}
public class Solution {
/**
*
* @param numbers int整型一维数组
* @param target int整型
* @return int整型一维数组
*/
public int[] twoSum (int[] numbers, int target) {
// write code here
HashMap<Integer,Integer> map = new HashMap<>();
for(int i=0; i< numbers.length;i++){
if(map.containsKey(target-numbers[i])){
return new int[]{map.get(target-numbers[i])+1,i+1};
}
map.put(numbers[i],i);
}
return null;
}
}
使用的是hashmap数据结构,数据成对存储