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DSA/GA1/ga1_last.py

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Python
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import random
def calc(A):
n = len(A)
res = 0
for i in range(0,n):
for j in range(i+1, n):
res += A[j] - A[i]
return res
def calc2(A):
n = len(A)
res = 0
for i in range(0,n):
res += (2*(i+1)-n-1)*A[i]
return res
def main():
for i in range(0,100):
A = []
for j in range(0,i):
A.append(random.randint(0,1000000))
if not calc(A) == calc2(A):
print("wrong!")
return
print("ok!")
if __name__ == "__main__":
main()