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  • HZ偶尔会拿些专业问题来忽悠那些非计算机专业的同学。今天测试组开完会后,他又发话了:在古老的一维模式识别中,常常需要计算连续子向量的最大和,当向量全为正数的时候,问题很好解决。但是,如果向量中包含负数,是否应该包含某个负数,并期望旁边的正数会弥补它呢?例如:{6,-3,-2,7,-15,1,2,2},连续子向量的最大和为8(从第0个开始,到第3个为止)。你会不会被他忽悠住?

    // test02.cpp : 定义控制台应用程序的入口点。
    //

    #include "stdafx.h"
    #include<iostream>
    #include<vector>
    #include<string>
    using namespace std;
    
    class Solution {
    public:
    	int FindGreatestSumOfSubArray(vector<int> array) {
    		int max;
    		int sum = 0;
    
    		if(!array.empty())
    		   max = array[0];
    		
    		for (int i = 0;i < array.size();i++)
    		{
    			sum = array[i];
    			for (int j = i + 1;j < array.size();j++)
    			{
    				if (sum > max)
    				{
    					max = sum;
    			//		cout << "max:" << max << endl;
    				}
    				sum += array[j];
    	
    			}
    			if (sum > max)
    			{
    				max = sum;
    		//		cout << "max:" << max << endl;
    			}
    			
    		}
    		return max;
    	}
    };
    
    int main()
    {
       //  vector<int> vec = { 1,2,3,2,2,2,5,4,2 };
    	// vector<int> vec = { 1, 2, 3, 2, 2, 2, 5, 4, 2 };
    //	 vector<int> vec = {6, -3, -2, 7, -15, 1, 2, 2};
    	//vector<int> vec = {-2, -8, -1, -5, -9};
    	vector<int> vec = { 2, 8, 1, 5, 9 };
    	int num = 0;
    	Solution so;
    	num = so.FindGreatestSumOfSubArray(vec);
    	//for (auto it = vec.begin();it != vec.end();it++)
    	//{
    	//	cout<<*it<< "  ";
    	//}
    	//
    	cout << "num:" << num << endl;
    
    	cout << endl;
    
    return 0;
    }
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  • 原文地址:https://www.cnblogs.com/wdan2016/p/5970690.html
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