Chia sẻ 200 bài tập Java cơ bản có lời giải chi tiết

 

package

bai10

;

import

java

.

util

.

Scanner

;

public

class

Main

{

    

public

static

int

nhap

(

)

{

        

Scanner

input

=

new

Scanner

(

System

.

in

)

;

        

boolean

check

=

false

;

        

int

n

=

0

;

        

while

(

!

check

)

{

            

System

.

out

.

print

(

” “

)

;

            

try

{

                

n

=

input

.

nextInt

(

)

;

                

check

=

true

;

            

}

catch

(

Exception

e

)

{

                

System

.

out

.

println

(

“Ban phai nhap so! hay nhap lai…”

)

;

                

input

.

nextLine

(

)

;

            

}

        

}

        

return

(

n

)

;

    

}

    

public

static

void

result

(

int

a

[

]

,

int

k

)

{

        

int

i

;

        

System

.

out

.

println

(

)

;

        

for

(

i

=

1

;

i

<

=

k

;

i

++

)

{

            

System

.

out

.

print

(

”  “

+

a

[

i

]

)

;

        

}

    

}

    

public

static

void

try_backTrack

(

int

a

[

]

,

int

n

,

int

k

,

int

i

)

{

        

int

j

;

        

for

(

j

=

a

[

i

1

]

+

1

;

j

<

=

(

n

k

+

i

)

;

j

++

)

{

            

a

[

i

]

=

j

;

            

if

(

i

==

k

)

result

(

a

,

k

)

;

            

else

try_backTrack

(

a

,

n

,

k

,

i

+

1

)

;

        

}

    

}

    

public

static

void

main

(

String

[

]

args

)

{

        

System

.

out

.

println

(

“Nhap n”

)

;

        

int

n

=

nhap

(

)

;

        

int

[

]

array

=

new

int

[

n

+

1

]

;

        

int

k

;

        

System

.

out

.

println

(

“Liet ke tat ca cac tap con k phan tu cua 1,2,..,”

+

n

+

” : “

)

;

        

for

(

k

=

1

;

k

<

=

n

;

k

++

)

{

            

System

.

out

.

println

(

“\n Tap con “

+

k

+

” phan tu: “

)

;

            

try_backTrack

(

array

,

n

,

k

,

1

)

;

        

}

    

}

 

}