python题解

n = int(input())
coeffs = list(map(int, input().split()))  # 输入系数，顺序是 x^n, x^(n-1)...x^0
res = []  

for i in range(n + 1):
    c = coeffs[i]  
    exp = n - i    
    
    if c == 0:
        continue  
    
    
    if not res:  
        sign = '-' if c < 0 else ''
    else:
        sign = '+' if c > 0 else '-'
    
    abs_c = abs(c)  
    term = ''
    
    
    if exp == 0:
        
        term = str(abs_c)
    elif exp == 1:
        if abs_c == 1:
            term = 'x'
        else:
            term = f'{abs_c}x'
    else:
        
        if abs_c == 1:
            term = f'x^{exp}'
        else:
            term = f'{abs_c}x^{exp}'
    
    res.append(sign + term)


print(''.join(res))