non-decreasing sequence
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def non_decreasing_sequence(boxes,chocolates):
#print(boxes)
#print(chocolates)
diff= []
for i in range(0,len(chocolates)-1):
if chocolates[i] > chocolates[i+1]:
diff.append(chocolates[i] - chocolates[i+1])
return sum(diff)
if __name__ == '__main__':
boxes = int(input())
chocolates = []
for _ in range(0,boxes):
chocolates.append(int(input()))
print(non_decreasing_sequence(boxes,chocolates))
Python
INFO