The compiler denied my correct code on nested if

#1

i write a code on nested if.The question is find the largest number from three numbers . my code is abosolutely right
the compiler gives the write output but when i submit this shows that my code is wrong please give me the solution although i can not complete the challenges.

#2

Take input from user
like cin>>Num1>>Num2>>Num3

#3

You can refer my code as well

#4

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