9. 33.Big power operation

   a=9
   n=50
   def pow_mod(a,n,mod):  # a**50=(a**2)**25, a**25=(a**2)**12*a,
       res = 1
       while n > 0 :
           if n % 2 == 1:  # if n is odd, extract new_a%mod and multiply res
               res = res * a % mod
           a = a * a % mod # 1.a=new_a ...

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10. 32.Triangle shape

    a=3
    b=4
    c=5
    [a,b,c]=sorted([a,b,c])
    print a+b<c and 'W' or a*a + b*b < c*c and 'D' or a*a + b*b == c*c and 'Z'or 'R'
    

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11. 31.The number of peaks

    h=[0.9,1.2,1.22,1.1,1.6,0.99]
    print sum([1 for i in range(1,len(h)-1) if h[i]>h[i-1] and h[i]>h[i+1]])
    

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12. 29.Judgment of the triangle

    a=5,b=7,c=10
    print sorted([a,b,c])[0] + sorted([a,b,c])[1] > sorted([a,b,c])[2] and 'YES' or 'NO'
    

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13. 28.The same number

    L=[1,2,2.5,3,4]
    print "NO" if (len(set(L))==len(L)) else "YES"
    

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14. 27.Gas Station

    limit = [1,2,3,4]
    cost = [4,2,1,3]
    
    sum = 0
    subsum = 0
    ix = 0
    for i in range(len(limit)):
        delta = limit[i] - cost[i]
        sum += delta
        subsum += delta
    
        if subsum < 0:
            ix = i + 1
            subsum = 0
    
    if sum<0:
        print -1
    else:
        print ix
    

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15. 26.Sequence to judge

    L=[1,2,3,4]
    print("UP" if L==sorted(L) else "DOWN" if L==sorted(L)[::-1] else "WRONG" )
    

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16. 25.Format the time

    t={'year':'2013','month':'9','day':'30','hour':'16','minute':'45','second':'2'}
    print '%04d-%02d-%02d %02d:%02d:%02d' %(int(t['year']), int(t['month']), int(t['day']), int(t['hour']), int(t['minute']), int(t['second']))
    

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17. 24.Horse take the lead

    m=2
    n=1
    
    if m < n:
        m, n = n, m
    
    horse = [(1, 2), (2, 1), (-1, 2), (-2, 1), (-2,-1),(-1,-2),(1, -2), (2, -1)]
    queue = [(0, 0)]
    goal = {(0, 0): 0}
    
    while queue != []:
        base = queue.pop(0)
    
        for item in horse:
            arrow = ((item[0] + base[0 ...

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18. 23.365 Or 366

    year="2013"
    print(366 if int(year)%400==0 or int(year)%4==0 and int(year)%100!=0 else 365)
    

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