Question: 1. , n . @12+ 22+ ...+ 2 @ : n = 4 @ : 12+ 22+ 32+ 42=30 @2. , n . @3. n

1. , n . @12+ 22+ ...+ 2 @ : n = 4 @ : 12+ 22+ 32+ 42=30 @2. , n . @3. n . @4. , n b. @0+ 1+ 2+ ...+ @ : b = 4, n = 3 @ : 40+ 41+ 42+ 43= 85 @5. N N . ..@. ( ). @ : 3 @1 2 3 @ : 3 2 1 @6. N N . . @. ( ), ( ). @: n (1<=n<=100). n . 20 . @: . @ : @3 @Abc @bcdh @abcdef @ : @abcdef @bcdh @a..c@7. , NxN , 1 N*N (. ). @. . @ 1: @3 @ 1: @1 2 3 @8 9 4 @7 6 5 @ 2: @4 @ 2: @1 2 3 4 @12 13 14 5 @11 16 15 6 @10 9 8 7 @8. n . : x1, x2, ..., xN , xi 1<=xi<=k. @. . @ 1: @2 3 @ 1: @1 1 @1 2 @1 3 @2 1 @2 2 @2 3 @3 1@3 2 @3 3 @ 2: @3 3 @ 2: @1 1 1 @1 1 2 @1 1 3 @1 2 1 @1 2 2 @1 2 3 @1 3 1 @1 3 2 @1 3 3 @2 1 1 @2 1 2 @2 1 3 @2 2 1 @2 2 2 @2 2 3 @2 3 1 @2 3 2 @2 3 3 @3 1 1 @3 1 2 @3 1 3 @3 2 1 @3 2 2 @3 2 3 @3 3 1 @3 3 2 @3 3 3 3 @9. ( ), M . ( ) . @ 1: @AB @ 1: ABBA @ 2: @IOX @ 2: @XOI @OIX @IXO @XIO @OXI IOX

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