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Datatähti 2017 loppu

Start:2017-01-19 12:15:00
End:2017-01-19 17:15:00
 

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CSES - Datatähti 2017 loppu - Results
History
2017-01-19 12:52:59100
Task:Tunnelit
Sender:ollpu
Submission time:2017-01-19 12:52:59
Language:C++
Status:READY
Score:100

Feedback

groupverdictscore
#1ACCEPTED16
#2ACCEPTED31
#3ACCEPTED53

Test results

testverdicttime (s)group
#1ACCEPTED0.05 / 1.001details
#2ACCEPTED0.04 / 1.001details
#3ACCEPTED0.04 / 1.001details
#4ACCEPTED0.03 / 1.001details
#5ACCEPTED0.03 / 1.001details
#6ACCEPTED0.06 / 1.002details
#7ACCEPTED0.05 / 1.002details
#8ACCEPTED0.03 / 1.002details
#9ACCEPTED0.03 / 1.002details
#10ACCEPTED0.04 / 1.002details
#11ACCEPTED0.12 / 1.003details
#12ACCEPTED0.10 / 1.003details
#13ACCEPTED0.07 / 1.003details
#14ACCEPTED0.06 / 1.003details
#15ACCEPTED0.05 / 1.003details

Compiler report

input/code.cpp: In function 'int main()':
input/code.cpp:25:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int qi = 0; qi < q.size(); ) {
                                ^

Code

#include <iostream>
#include <vector>
#define F first
#define S second
using namespace std;
int from[101010], to[101010];
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  int n, m;
  cin >> n >> m;
  vector<pair<int, int>> v[n];
  for (int i = 0; i < m; ++i) {
    int a, b;
    cin >> a >> b;
    v[--a].push_back({--b, 1});
    from[a]++;
    to[b]++;
  }
  vector<int> q;
  for (int i = 0; i < n; ++i) {
    if (!to[i] && from[i]) q.push_back(i);
  }
  int result = 0;
  for (int qi = 0; qi < q.size(); ) {
    int i = q[qi];
    int cn = i;
    int asd = 0;
    while (from[cn]) {
      for (pair<int, int> &cv : v[cn]) {
        if (!cv.S) continue;
        cv.S = 0;
        from[cn]--;
        to[cv.F]--;
        cn = cv.F;
        if (!to[cn] && from[cn]) q.push_back(cn);
        asd = 1;
        break;
      }
    }
    result += asd;
    if (!from[i]) qi++;
  }
  cout << result << endl;
}

Test details

Test 1

Group: 1

Verdict: ACCEPTED

input
10 20
4 5
6 4
5 1
5 9
...
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correct output
11

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user output
11

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Test 2

Group: 1

Verdict: ACCEPTED

input
10 10
7 3
5 2
9 7
1 5
...
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correct output
5

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user output
5

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Test 3

Group: 1

Verdict: ACCEPTED

input
10 5
5 7
3 8
5 8
3 7
...
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correct output
4

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user output
4

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Test 4

Group: 1

Verdict: ACCEPTED

input
10 4
9 1
6 8
7 1
5 7
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correct output
3

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user output
3

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Test 5

Group: 1

Verdict: ACCEPTED

input
10 2
10 6
2 1

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correct output
2

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user output
2

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Test 6

Group: 2

Verdict: ACCEPTED

input
100 200
24 40
25 6
36 93
92 90
...
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correct output
97

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user output
97

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Test 7

Group: 2

Verdict: ACCEPTED

input
100 100
98 37
91 37
60 92
46 27
...
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correct output
60

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user output
60

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Test 8

Group: 2

Verdict: ACCEPTED

input
100 50
74 95
53 72
69 85
14 13
...
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correct output
34

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user output
34

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Test 9

Group: 2

Verdict: ACCEPTED

input
100 40
28 76
10 81
13 52
46 83
...
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correct output
29

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user output
29

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Test 10

Group: 2

Verdict: ACCEPTED

input
100 20
27 35
72 92
56 4
64 80
...
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correct output
18

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user output
18

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Test 11

Group: 3

Verdict: ACCEPTED

input
100000 200000
89244 59358
22943 56710
63331 89437
56581 38400
...
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correct output
102510

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user output
102510

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Test 12

Group: 3

Verdict: ACCEPTED

input
100000 100000
21701 85599
61542 21474
38081 29362
46316 64038
...
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correct output
60593

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user output
60593

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Test 13

Group: 3

Verdict: ACCEPTED

input
100000 50000
86469 4833
16351 35505
59315 33011
95464 16985
...
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correct output
35933

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user output
35933

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Test 14

Group: 3

Verdict: ACCEPTED

input
100000 40000
5392 23534
63204 45619
74330 25925
59678 88427
...
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correct output
30074

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user output
30074

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Test 15

Group: 3

Verdict: ACCEPTED

input
100000 20000
80156 16531
71753 77661
7028 33389
17168 646
...
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correct output
16882

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user output
16882

view   save