分析下列算法的时间复杂度。 ( 1 ) x, y=90, 100 while y>0: if x>100: x=x-10 y=y-1 else: x=x+1 ( 2 ) for i in range(n): for j in range(m): y=y+1 ( 3 ) s=0 for i in range(n): for j in range(n): s=s+1 ( 4 ) i=1 while i<=n: i=i*3 ( 5 ) x=0 for i in range(n): for j in range(1, n-i+1): x=x+1 ( 6 ) x, y = n, 0 #n>1 while x>=(y+1)*(y+1): y=y+1