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QuestionFind maximun range of an array Pin
Member 135010212-Nov-17 22:35
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QuestionCalculate sum of M natural numbers starting from N. Pin
Member 134789861-Nov-17 9:16
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AnswerRe: Calculate sum of M natural numbers starting from N. Pin
Victor Nijegorodov1-Nov-17 9:49
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Member 134789861-Nov-17 10:19
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AnswerRe: Calculate sum of M natural numbers starting from N. Pin
CPallini1-Nov-17 10:53
mveCPallini1-Nov-17 10:53 
You need no iteration, actually.

Since (see 1 + 2 + 3 + 4 + ⋯ - Wikipedia[^])
1 + 2 + ... + n = n * (n + 1) / 2


In your case
SUM = ((N + M - 1) * (N + M) - (N - 1) * (N)) / 2


Let's try the formula with the input
N=3, M=4

SUM = ((3 + 4 -1) * (3 + 4) - (3) * (2)) / 2 = (6 * 7 - 3 * 2) / 2 = (42 - 6) / 2 = 18

GeneralRe: Calculate sum of M natural numbers starting from N. Pin
Member 134789861-Nov-17 10:57
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Question[win32] sprite error ? Pin
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