cp_library/math/series/arthsum_fn.py

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• Last update: 2025-03-30 20:17:47+09:00

Code

import cp_library.math.series.__header__

def arthsum(d, a, n):
    return ((n-1)*d+(a<<1))*n >> 1

'''
╺━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╸
             https://kobejean.github.io/cp-library               
'''

def arthsum(d, a, n):
    return ((n-1)*d+(a<<1))*n >> 1

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