leetcode题1Two sum 练习

题目为:

给一个整数数组, 返回数组中的两数之和等于指定值的两数在数组中的下标.

Example:

Given nums = [2, 7, 11, 15], target = 9,

Because nums[0] + nums[1] = 2 + 7 = 9,
return [0, 1].
 
public int[] TwoSum(int[] nums, int target) {
        int[] result=new int[2];//创建一个返回数组;
        
          for (int j = 0; j < nums.Length; j++)//{1,4,5,7,9,10};//{9,6,5,3,1,0}外层循环,传进的数组赋值
            {
                for (int k = j+1; k < nums.Length; k++)//创建内层循环,内层循环主要是让temp[i]=target-nums[i];让temp[i]的值与数组nums[i]比自己大的元素比较看是否相等。
                {
                    
                    if (target - nums[j] == nums[k])
                    {
                        
                        result[0] = j;//相等就记录该位置。
                        result[1] = k;//记录相等的位置。
                    }
                    
                }
            }


            return result;
}

附上该例源码:

namespace ConsoleApplication1
{
    class addtwonum
    {
        public static void Main(string[] args)
        {
            int[] num = { 2, 4, 4, 4, 4, 10 };//{9,6,5,3,1,0}
            int[] result = getnum(num, 8);
            for (int i = 0; i < result.Length; i++)
            {
                Console.WriteLine(result[i]);
            }
            Console.ReadLine();
        }
        //
        //{1,2,3,4,6} tagart =5
        //a[0]+a[3] ,a[1]+a[2] [0,3],[1,2]
        private static int[] getnum(int []nums,int tagart)
        {
            int[] result=new int[2];
            int[] temp=new int[nums.Length];
            //for (int i = 0; i < nums.Length; i++)
            //    temp[i] = tagart - nums[i];
            for (int j = 0; j < nums.Length; j++)//{2, 4, 4, 7, 9, 10};//{6,4,4,-1,-2,-3}|{7,5,5,2,0,-1}
            {
                for (int k = j+1; k < nums.Length; k++)
                {
                    //result[0] = j;
                    //result[1] = k;
                    if (tagart - nums[j] == nums[k])
                    {
                        //j = nums.Length - 1;
                        //k = nums.Length;
                        result[0] = j;
                        result[1] = k;
                    }

                }
            }


            return result;
        }

    }
}
原文地址:https://www.cnblogs.com/Hackerman/p/5746510.html