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【C】最大子序列和

作者:tpythoner / 发布于2015/7/9/ 1160


	#include <stdio.h>
	
	//最大子序列和问题
	int maxSum(int arr[], int num) {
	
	 int thisSum, maxSum = 0;
	
	 for (int i = 0; i < num; i++) {
	 for (int j = i; j < num; j++) {
	 thisSum = 0;
	 for (int k = i; k <= j; k++) {
	 thisSum += arr[k];
	 }
	 if (thisSum > maxSum) {
	 maxSum = thisSum;
	 }
	 }
	 }
	
	 return maxSum;
	}
	
	
	int maxSum2(int arr[], int num) {
	
	 int thisSum, maxSum = 0;
	
	 for (int i = 0; i < num; i++) {
	 thisSum = 0;
	 for (int j = i; j < num; j++) {
	 thisSum += arr[j];
	 if (thisSum > maxSum) {
	 maxSum = thisSum;
	 }
	 }
	 }
	
	 return maxSum;
	
	}
	
	int main() {
	 int a[] = {-2, 11, -4, 13, -5, 2, -5, -3, 12, -9};
	 int b[] = {0, -3, 6, 8, -20, 21, 8, -9, 10, -1, 3, 6, 5};
	
	 printf("maxSum %d\n", maxSum(a, sizeof(a)/sizeof(a[0])));
	 printf("maxSum2 %d\n", maxSum2(a, sizeof(a)/sizeof(a[0])));
	 return 0;
	}

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