This problem, although it is to find the maximum integer A, is actually an existence problem, i.e., there exists a maximum integer A such that the sum of 10 consecutive numbers is not less than A.
Solution: Let T=(a1,a2,⋯,a100) be a permutation of the natural numbers from 1 to 100.
Consider the sum of 10 consecutive terms
k=1∑10aa+k,n=1,2,⋯,90.
This is a finite set, and in a finite set, there must be a maximum number, denoted as
AT=1⩽n⩽90maxio D=1∑an+x0
Any other sum of 10 consecutive terms does not exceed Ax.
By the definition of AΓ, we have
AT⩾a1+a2+⋯+a10AT⩾a11+a12+⋯+a20,⋯⋯AX⩾a61+a82+⋯+a100
Adding these up, we get
10Ar⩾1=1∑100a1=5050,
→mosers
AT>505.
According to the problem, we need to find the smallest Ax among all permutations T, i.e.,
A=minAr
Below, we can find a permutation T′ such that for the permutation T′, its AT′⩽505.
For example, we can arrange the numbers from 1 to 100 as follows:
T′=(100,1,99,2,98,3,97,4,⋯,51,50),
which satisfies
a2Ω+1=100−n,0⩽n⩽49,a2n=n,1⩽n⩽50.
At this point, we have
a2k+a2k+1+⋯+a2k+2=(a2k+a2k+2+a2k+4+a2k+0+a2k+8)+(a2k+1+a2k+8+a2k+5+a2k+1+a2k+0)=(k+k+1+k+2+k+3+k+4)+[100−k+100−(k+1)+100−(k+2)+100−(k+3)+100−(k+4)]=500a2k+1+a2k+2+⋯+a2k+10=(a2k+a2k+1)+(a2k+2+a2k+8)+⋯
==+(a2k+8+a2k+2)+a2k+10−a2k500+k+5−5505.
Thus, Ax′⩽505.
From (1) and (2), we get A=505.