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SummerGift
EmbeddedSystem
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01_1_Maxsubsequencesum_question.cpp
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01_1_Maxsubsequencesum_question.cpp
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/*
* Maxsubsequencesum_1.cpp
*
* Created on: 2018年4月7日
* Author: Summer
*/
/*
01-复杂度1 最大子列和问题(20 分)
给定K个整数组成的序列{ N1, N2, ..., NK },“连续子列”被定义为{ Ni, Ni+1, ..., Nj },
其中 1 <= i <= j <= K。“最大子列和”则被定义为所有连续子列元素的和中最大者。
例如给定序列{ -2, 11, -4, 13, -5, -2 },其连续子列{ 11, -4, 13 }有最大的和20。
现要求你编写程序,计算给定整数序列的最大子列和。
本题旨在测试各种不同的算法在各种数据情况下的表现。各组测试数据特点如下:
数据1:与样例等价,测试基本正确性;
数据2:102个随机整数;
数据3:103个随机整数;
数据4:104个随机整数;
数据5:105个随机整数;
输入格式:
输入第1行给出正整数K (≤100000);第2行给出K个整数,其间以空格分隔。
输出格式:
在一行中输出最大子列和。如果序列中所有整数皆为负数,则输出0。
输入样例:
6
-2 11 -4 13 -5 -2
输出样例:
20
*/
#include <stdio.h>
static int MaxSubseqSum1( int A[], int N )
{ int ThisSum, MaxSum;
int i;
ThisSum = MaxSum = 0;
for( i = 0; i < N; i++ ) {
ThisSum += A[i]; /* 向右累加 */
if( ThisSum > MaxSum )
MaxSum = ThisSum; /* 发现更大和则更新当前结果 */
else if( ThisSum < 0 ) /* 如果当前子列和为负 */
ThisSum = 0; /* 则不可能使后面的部分和增大,抛弃之 */
}
return MaxSum;
}
//int main()
//{
// int i, *a;
// int arraycount;
// int result;
// scanf("%d",&arraycount);
//
// a = malloc(sizeof(int) * arraycount); /*分配内存*/
//
// for(i = 0; i < arraycount; i++)
// scanf("%d", a + i);
//
// result = MaxSubseqSum1(a, arraycount);
// printf("%d",result);
//
// return 0;
//}
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