1.

A list contains rollno, name and marks of the student. Sort the list in descending order of marks using selection sort algorithm.

Answer»

def selection_sort(DATA_LIST):

for i in range(0, len (DATA_LIST)):

min = i

for j in range(i + 1, len(DATA_LIST)):

if DATA_LIST[j][2] > DATA_LIST[min][2]:

min = j

# swapping

DATA_LIST[min] [0] ,

DATA_LIST[i] [0] = DATA_LIST[i] [0] ,

DATA_LIST[mm] [0] DATA_LIST[min][l],

DATA_LIST[i][l] = DATA_LI ST [i] [ 1 ],

DATA_LI ST [min] [ 1 ] DATA_LIST[min] [2] ,

DATA_LIST[i] [2] = DATA_LIST[i] [2],

DATA_LIST[min] [2]

print DATA_LIST

maxrange=input(“Enter Number of Students: ”)

Students=[]

for i in range(maxrange):

Details=[]

Details. append(input(“Enter roll_no”))

Details.append(raw_input(“Enter name”))

Details. append(inprft(“Enter marks”))

Students.append(Details)

print Students

selection_sort(Students)


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