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3.5.3 for 循环 的算法有问题 #577

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@feiquan123

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func LoopAdd(cnt, v0, step int) int {
	result := v0
	for i := 0; i < cnt; i++ {
		result += step
	}
	return result
}

比如 1+2+...+100 等差数列可以这样计算 LoopAdd(100, 1, 1),而 10+8+...+0 等差数列则可以这样计算 LoopAdd(5, 10, -2)。

问题描述

按这个算法
LoopAdd(100, 1, 1) = 101 期望:5050
LoopAdd(5, 10, -2) = 0 期望:30

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