CSES - Datatähti 2016 alku - Results
Submission details
Task:Lennot
Sender:ollpu
Submission time:2015-10-03 21:01:42 +0300
Language:Python2
Status:READY
Result:0
Feedback
groupverdictscore
#10
#20
#30
Test results
testverdicttimegroup
#10.06 s1details
#2ACCEPTED0.06 s1details
#3ACCEPTED0.08 s1details
#4ACCEPTED0.05 s1details
#5ACCEPTED0.06 s1details
#6ACCEPTED0.17 s2details
#70.29 s2details
#80.09 s2details
#90.21 s2details
#100.10 s2details
#110.41 s3details
#120.41 s3details
#130.40 s3details
#140.40 s3details
#150.41 s3details
#160.42 s3details
#170.41 s3details

Code

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import sys
from sys import stdin
from sys import stdout

maxint = sys.maxint

def readline():
    return stdin.readline().strip()

line1 = readline().split(' ')
# Kaupunkeja
n = int(line1[0])
# Lentoja
m = int(line1[1])

class Flight:
    def __init__(self, a, b, h):
        self.fr = a
        self.to = b
        self.price = int(h)

class City:
    def __init__(self, aid):
        self.total_price_even = maxint
        self.even_price_set = False
        self.total_price_odd = maxint
        self.odd_price_set = False
        self.calculated = False
        self.con_fr = []
        self.con_to = []
        self.aid = aid
        self.remove = False
    def __eq__(self, other):
        return (isinstance(other, self.__class__)
            and self.aid == other.aid)


flights = []
cities = []
for c in xrange(n):
    cities.append(City(c))

uncalculated = list(cities)

for f in xrange(m):
    row = readline().split(' ')
    flight = Flight(cities[int(row[0])-1], cities[int(row[1])-1], row[2])
    flights.append(flight)
    flight.fr.con_to.append(flight)
    flight.to.con_fr.append(flight)

# Purge all unnecessary cities
# removes = []
# for city_i in xrange(n):
#     if city_i > 0:
#         if city_i < len(cities)-1:
#             city = cities[city_i]
#             if len(city.con_to) == 0 or len(city.con_fr) == 0:
#                 for flight_i in city.con_to:
#                     flights.remove(flight_i)
#                 for flight_i in city.con_fr:
#                     flights.remove(flight_i)
#                 removes.append(city)
#         else:
#             break
# for city in removes:
#     cities.remove(city)

start = cities[0]
end = cities[-1]
current = start

current.total_price_even = 0
current.even_price_set = True



found = False
while not found:
    for flight in current.con_to:
        city = flight.to
        if not city.calculated:
            if current.even_price_set:
                new_odd_price = current.total_price_even + flight.price
                if new_odd_price < city.total_price_odd:
                    city.total_price_odd = new_odd_price
                    city.odd_price_set = True
            
            if current.odd_price_set:
                new_even_price = current.total_price_odd
                if new_even_price < city.total_price_even:
                    city.total_price_even = new_even_price
                    city.even_price_set = True
    uncalculated.remove(current)
    current.calculated = True
    if current == end:
        found = True
        print(min(current.total_price_even, current.total_price_odd))
        # if current.total_price_even < maxint and current.total_price_odd < maxint:
        #     raise
        break
    
    smallest_price = maxint
    for city in reversed(uncalculated):
        # cityprice = city.total_price_even + city.total_price_odd
        cityprice = min(city.total_price_even, city.total_price_odd)
        if cityprice < smallest_price:
            smallest = city
            smallest_price = cityprice
    
    current = smallest

Test details

Test 1

Group: 1

Verdict:

input
10 20
2 1 3
7 6 4
1 6 7
1 6 1
...

correct output
8

user output
13

Test 2

Group: 1

Verdict: ACCEPTED

input
10 20
4 3 10
1 10 9
3 4 10
2 6 7
...

correct output
9

user output
9

Test 3

Group: 1

Verdict: ACCEPTED

input
10 20
5 7 4
6 1 1
7 3 8
8 4 2
...

correct output
8

user output
8

Test 4

Group: 1

Verdict: ACCEPTED

input
10 20
1 6 2
5 3 3
7 3 6
5 6 2
...

correct output
13

user output
13

Test 5

Group: 1

Verdict: ACCEPTED

input
10 20
10 8 5
2 4 7
9 4 7
9 4 1
...

correct output
4

user output
4

Test 6

Group: 2

Verdict: ACCEPTED

input
1000 2000
91 828 365044406
17 984 445675537
251 852 100987451
907 487 58830088
...

correct output
11893353673

user output
11893353673

Test 7

Group: 2

Verdict:

input
1000 2000
722 939 530579090
404 606 268877348
133 750 760086153
506 46 582310443
...

correct output
30248963445

user output
30856853648

Test 8

Group: 2

Verdict:

input
1000 2000
340 237 43690066
217 141 453160975
744 202 639037814
605 926 404985542
...

correct output
3126797692

user output
3268705540

Test 9

Group: 2

Verdict:

input
1000 2000
88 312 190442306
480 402 411574469
29 901 397491243
636 459 323246996
...

correct output
18416073173

user output
20319427407

Test 10

Group: 2

Verdict:

input
1000 2000
333 228 718389176
796 286 323493090
743 43 751876815
128 554 175625940
...

correct output
6399349335

user output
6518176073

Test 11

Group: 3

Verdict:

input
100000 200000
28264 92686 186865663
92570 33956 925976418
87377 71249 644757113
16701 81203 922125505
...

correct output
518249578675

user output
(empty)

Test 12

Group: 3

Verdict:

input
100000 200000
95740 71482 846654568
44131 16806 670712211
3967 49254 424174139
39369 53007 830346557
...

correct output
920862321580

user output
(empty)

Test 13

Group: 3

Verdict:

input
100000 200000
79947 25489 71554257
59184 25577 328436360
82945 73554 4942918
22380 92385 874250042
...

correct output
399407698440

user output
(empty)

Test 14

Group: 3

Verdict:

input
100000 200000
31139 12960 580545990
27744 95556 747296719
46969 42578 840321561
5638 28960 513805324
...

correct output
165235287505

user output
(empty)

Test 15

Group: 3

Verdict:

input
99993 199980
1 3 1
3 2 1
1 4 1
4 2 1
...

correct output
2

user output
(empty)

Test 16

Group: 3

Verdict:

input
100000 149994
93867 98509 1755709
85029 99843 1347591
10305 35305 6447
75638 80585 1829972
...

correct output
1124960

user output
(empty)

Test 17

Group: 3

Verdict:

input
100000 200000
70413 71496 49
15963 40963 18635
81291 89420 1850028
8848 33848 17316
...

correct output
110298

user output
(empty)