Submission details
Task:Lennot
Sender:konstikas
Submission time:2015-10-07 22:04:48 +0300
Language:Python3
Status:READY
Result:61
Feedback
groupverdictscore
#1ACCEPTED24
#2ACCEPTED37
#30
Test results
testverdicttimegroup
#1ACCEPTED0.10 s1details
#2ACCEPTED0.09 s1details
#3ACCEPTED0.10 s1details
#4ACCEPTED0.10 s1details
#5ACCEPTED0.10 s1details
#6ACCEPTED0.10 s2details
#7ACCEPTED0.10 s2details
#8ACCEPTED0.10 s2details
#9ACCEPTED0.10 s2details
#10ACCEPTED0.11 s2details
#11--3details
#12--3details
#13ACCEPTED0.98 s3details
#14ACCEPTED0.81 s3details
#15ACCEPTED0.90 s3details
#16ACCEPTED0.88 s3details
#17--3details

Code

#!/usr/bin/env python3

# halvin lentoyhteys kaupungista 1 -> n, parilliset lennot ilmaisia

# esimerkkitapaus:
'''
Syöte:
4 6
1 2 5
2 3 8
2 1 4
3 1 6
3 4 1
4 2 3

Tuloste:
6
'''

from heapq import heappush, heappop
from collections import defaultdict

def main():
    n, m = map(int, input().split())
    reitit = defaultdict(dict)

    for i in range(m):
        a, b, c = map(int, input().split())
        a_reitit = reitit.setdefault(a, {})
        if b not in a_reitit or a_reitit[b] > c:
            a_reitit[b] = c

    seur = []
    heappush(seur, (0, 1, False))  # (yhthinta, sijainti, seuraava ilmainen)

    saav_parill = [None] * (n + 1)  # yhteishinnat, joilla tultu kohteeseen parillisella lennolla
    saav_parill[1] = 0
    saav_paritt = [None] * (n + 1)  # yhteishinnat, joilla tultu kohteeseen paritomalla lennolla

    maalissa = False

    while seur:
        yht, i, ilmainen = heappop(seur)
        for kohde, hinta in reitit[i].items():
            if ilmainen:
                if saav_parill[kohde] is None or saav_parill[kohde] > yht:
                    saav_parill[kohde] = yht
                    # lisätään jatkoon
                    heappush(seur, (yht, kohde, False))
            else:
                kohdehinta = yht + hinta
                if saav_paritt[kohde] is None or saav_paritt[kohde] > kohdehinta:
                    saav_paritt[kohde] = kohdehinta
                    # lisätään jatkoon
                    heappush(seur, (kohdehinta, kohde, True))

    print(min(x for x in (saav_parill[n], saav_paritt[n]) if x is not None))

if __name__ == '__main__':
    main()

Test details

Test 1

Group: 1

Verdict: ACCEPTED

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

correct output
8

user output
8

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: ACCEPTED

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

correct output
30248963445

user output
30248963445

Test 8

Group: 2

Verdict: ACCEPTED

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

correct output
3126797692

user output
3126797692

Test 9

Group: 2

Verdict: ACCEPTED

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

correct output
18416073173

user output
18416073173

Test 10

Group: 2

Verdict: ACCEPTED

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

correct output
6399349335

user output
6399349335

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: ACCEPTED

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

correct output
399407698440

user output
399407698440

Test 14

Group: 3

Verdict: ACCEPTED

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

correct output
165235287505

user output
165235287505

Test 15

Group: 3

Verdict: ACCEPTED

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

correct output
2

user output
2

Test 16

Group: 3

Verdict: ACCEPTED

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

correct output
1124960

user output
1124960

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)