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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