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# Author Problem Lang Verdict Time Memory Sent Judged  
169756749 Practice:
navyamedi_2002 		1709B - 11 Python 3 Accepted 623 ms 31592 KB 2022-08-27 07:23:09 2022-08-27 07:23:09
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_,(*a,),*r=(map(int,s.split())for s in open(0))
b=[[0],[0]]
for x in b:
 for u,v in zip([0]+a,a):x+=x[-1]+max(0,u-v),
 max=min
for s,t in r:l=b[s>t];print(l[t]-l[s])
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