Answer to Question #207275 in Python for Siva

Question

Given polynomial, write a program that prints polynomial in Cix^Pi + Ci-1x^Pi-1 + .... + C1x + C0 format.

where Pi's are powers in decreasing order, Ci is coefficient, and C0 is constant. There will be space before and after the plus or minus sign.If the coefficient is zero, then don't print the term.

If the term with the highest degree is negative, the term should represent -Cix^Pi.

For the term where power is 1, represent it as C1x instead of C1x^1.

For term Cix^Pi, if the coefficient of the term Ci is 1, print x^Pi instead of 1x^Pi.

Explanation

If N = 4 If N = 5

If N=4
polynomial represents "6x^3+10x^2+5"   
If N=5
polynomial represents "7x^4+6x^3+x^2+3x+2"

Answer 1

N = int(input('N = '))
polinom = {}
for i in range(N):
	power_i, coef_i = input(f'pow{i} coef{i} ').split()
	power_i, coef_i = int(power_i), int(coef_i)
	if power_i not in polinom:
		polinom[power_i] = coef_i
	else:
		polinom[power_i] += coef_i


if len(polinom) == 0:
	print('0')
else:
	str_polinom = ''
	for power_i in sorted(polinom, reverse=True):
		if polinom[power_i] == 0:
			continue
		elif polinom[power_i] < 0:
			if len(str_polinom) == 0:
				str_polinom += '-'
			else:
				str_polinom += ' - '
		else:
			if len(str_polinom) > 0:
				str_polinom += ' + '
		if (abs(polinom[power_i]) == 1) and power_i == 0:
			str_polinom += '1'
			continue
		elif abs(polinom[power_i]) != 1:
			str_polinom += str(abs(polinom[power_i]))
		if power_i < 0:
			str_polinom += f'x^({power_i})'
		elif power_i == 1:
			str_polinom += 'x'
		elif power_i > 0:
			str_polinom += f'x^{power_i}'
	if len(str_polinom) == 0:
		print('0')
	else:
		print(str_polinom)