cp_library/math/series/geosum_fn.py

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

Code

import cp_library.math.series.__header__

def geosum(a, r, n):
    return a*n if r == 1 else a*(pow(r,n)-1)//(r-1)

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

def geosum(a, r, n):
    return a*n if r == 1 else a*(pow(r,n)-1)//(r-1)

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