QOJ.ac
QOJ
| ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
|---|---|---|---|---|---|---|---|---|---|
| #43786 | #2569. Kill All Termites | Ufowoqqqo | AC ✓ | 22ms | 9724kb | C++ | 1.1kb | 2022-08-10 23:19:37 | 2022-08-10 23:19:37 |
Judging History
answer
#include <bits/stdc++.h>
#define rep(i, a, b) for (int i = (a); i < (b); i++)
using namespace std;
typedef vector<int> vi;
const int N = (int)1e5 + 50;
int n;
vi G[N];
int deg[N];
int res = 0;
int dfs(int v, int p) {
int has = 0;
int is_leaf = 1;
for (int nxt : G[v]) {
if(nxt == p) continue;
has += dfs(nxt, v);
is_leaf = 0;
}
if(is_leaf) has++;
if(has > 1) {
res++;
return 0;
} else {
return has;
}
}
int main() {
ios::sync_with_stdio(false);
cin.tie(NULL);
// freopen("hamster.in", "r", stdin);
// freopen("hamster.out", "w", stdout);
cin >> n;
rep(i, 1, n) {
int p;
cin >> p; p--;
deg[p]++;
deg[i]++;
G[p].push_back(i);
G[i].push_back(p);
}
int lf = -1;
rep(i, 0, n) {
if(deg[i] <= 1) {
lf = i;
break;
}
}
if(dfs(lf, -1)) res++;
cout << res << '\n';
// res = max(res, 1);
// cout << res << '\n';
}
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 4ms
memory: 5956kb
input:
1
output:
1
result:
ok 1 number(s): "1"
Test #2:
score: 0
Accepted
time: 0ms
memory: 5820kb
input:
2 1
output:
1
result:
ok 1 number(s): "1"
Test #3:
score: 0
Accepted
time: 3ms
memory: 5940kb
input:
8 1 1 2 1 2 3 2
output:
2
result:
ok 1 number(s): "2"
Test #4:
score: 0
Accepted
time: 2ms
memory: 6180kb
input:
3 1 1
output:
1
result:
ok 1 number(s): "1"
Test #5:
score: 0
Accepted
time: 3ms
memory: 6008kb
input:
4 1 1 1
output:
1
result:
ok 1 number(s): "1"
Test #6:
score: 0
Accepted
time: 0ms
memory: 6324kb
input:
5 1 1 1 1
output:
1
result:
ok 1 number(s): "1"
Test #7:
score: 0
Accepted
time: 3ms
memory: 5940kb
input:
6 1 2 2 2 1
output:
1
result:
ok 1 number(s): "1"
Test #8:
score: 0
Accepted
time: 3ms
memory: 5960kb
input:
7 1 2 1 4 3 4
output:
1
result:
ok 1 number(s): "1"
Test #9:
score: 0
Accepted
time: 1ms
memory: 5932kb
input:
9 1 1 2 3 1 4 2 7
output:
2
result:
ok 1 number(s): "2"
Test #10:
score: 0
Accepted
time: 3ms
memory: 5928kb
input:
10 1 2 3 3 1 2 3 7 9
output:
2
result:
ok 1 number(s): "2"
Test #11:
score: 0
Accepted
time: 3ms
memory: 6024kb
input:
11 1 1 2 1 5 6 7 3 3 2
output:
2
result:
ok 1 number(s): "2"
Test #12:
score: 0
Accepted
time: 3ms
memory: 5824kb
input:
12 1 1 3 3 2 1 4 7 4 8 10
output:
2
result:
ok 1 number(s): "2"
Test #13:
score: 0
Accepted
time: 3ms
memory: 5928kb
input:
13 1 1 3 4 1 4 4 3 6 1 1 4
output:
2
result:
ok 1 number(s): "2"
Test #14:
score: 0
Accepted
time: 0ms
memory: 6240kb
input:
14 1 2 3 2 4 1 4 7 3 9 7 8 4
output:
3
result:
ok 1 number(s): "3"
Test #15:
score: 0
Accepted
time: 3ms
memory: 5956kb
input:
100 1 2 1 1 3 6 5 5 4 8 4 4 3 14 10 14 8 13 12 18 8 3 7 1 12 10 9 17 26 30 21 11 29 19 20 25 17 10 9 26 6 40 42 29 2 24 14 25 6 41 47 24 21 46 28 8 30 2 19 41 54 43 23 1 65 21 19 35 58 8 71 59 12 2 13 4 16 7 22 58 26 44 1 12 14 80 19 12 43 77 21 54 41 94 37 61 28 82 30
output:
19
result:
ok 1 number(s): "19"
Test #16:
score: 0
Accepted
time: 1ms
memory: 5960kb
input:
100 1 2 3 4 4 6 7 8 9 10 11 10 13 14 15 16 17 17 19 19 15 22 23 15 13 26 27 28 29 30 30 32 28 26 13 36 37 38 39 40 41 42 43 44 45 45 47 48 48 48 51 47 44 54 43 56 56 58 59 60 60 59 63 64 64 66 66 64 69 70 56 72 73 72 75 76 77 42 40 80 40 82 83 83 85 85 85 88 89 88 91 40 38 37 95 96 95 95 2
output:
17
result:
ok 1 number(s): "17"
Test #17:
score: 0
Accepted
time: 3ms
memory: 6056kb
input:
1000 1 2 3 3 5 6 7 8 9 10 11 12 11 14 15 16 16 18 19 19 21 22 23 22 21 26 27 28 29 30 31 28 27 27 35 26 37 38 39 40 41 42 43 44 41 40 47 39 18 50 51 52 53 54 55 56 57 58 59 60 60 58 57 64 65 66 67 66 65 70 71 72 73 72 64 76 76 78 79 80 56 82 18 84 84 86 86 88 88 14 14 92 14 94 94 96 96 98 98 100 101...
output:
169
result:
ok 1 number(s): "169"
Test #18:
score: 0
Accepted
time: 0ms
memory: 5996kb
input:
1000 1 2 2 2 2 2 7 2 2 2 2 2 2 2 15 15 15 2 2 2 21 1 23 23 25 25 23 1 1 1 31 31 31 31 31 31 31 1 39 40 39 42 43 42 42 42 39 39 39 50 50 39 39 54 54 39 57 57 39 60 60 60 60 60 60 39 67 67 69 67 67 67 67 39 75 75 77 77 75 75 75 39 39 39 85 39 39 39 39 39 91 91 93 39 95 95 95 98 98 95 95 95 103 103 105...
output:
152
result:
ok 1 number(s): "152"
Test #19:
score: 0
Accepted
time: 1ms
memory: 6032kb
input:
1000 1 2 3 4 5 6 7 8 7 10 11 11 10 14 6 4 17 17 19 20 3 22 23 23 25 26 23 28 29 30 31 32 33 33 31 36 37 31 3 2 41 42 43 44 42 46 47 48 49 50 51 48 53 54 53 56 57 57 59 60 60 62 63 64 64 66 66 59 69 70 71 70 69 74 75 75 53 78 79 78 78 82 83 53 85 86 86 88 88 88 85 85 85 47 95 96 97 98 99 100 101 100 ...
output:
181
result:
ok 1 number(s): "181"
Test #20:
score: 0
Accepted
time: 3ms
memory: 6384kb
input:
1000 1 2 3 3 5 6 3 8 9 9 3 12 12 12 2 2 17 18 17 20 20 20 17 17 25 17 17 28 2 30 30 32 30 30 35 30 2 38 2 40 41 41 40 40 40 46 47 48 46 50 46 52 46 54 55 54 54 54 2 60 61 62 61 60 60 66 60 60 2 70 71 2 73 73 75 73 77 77 73 80 81 80 83 73 85 85 73 88 88 90 90 88 2 94 95 95 94 98 98 98 101 101 98 104 ...
output:
205
result:
ok 1 number(s): "205"
Test #21:
score: 0
Accepted
time: 3ms
memory: 6056kb
input:
1000 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 28 30 31 32 33 34 35 36 31 38 39 40 41 42 43 44 44 46 47 47 49 50 44 52 44 54 55 56 57 58 59 60 61 62 63 64 65 66 66 68 69 70 71 72 72 72 75 76 77 78 79 77 81 82 76 84 85 85 71 88 71 90 91 91 93 94 94 96 90 98 99 100 101...
output:
165
result:
ok 1 number(s): "165"
Test #22:
score: 0
Accepted
time: 3ms
memory: 6072kb
input:
1000 1 2 2 2 2 2 2 2 1 1 1 1 13 13 13 13 13 13 13 13 13 13 13 1 25 25 1 1 1 1 1 1 1 1 1 1 1 38 38 38 38 38 38 38 38 38 38 38 38 38 38 52 38 38 38 38 38 38 38 38 38 38 38 38 38 66 38 1 1 70 70 70 70 70 70 70 70 70 70 70 70 1 1 1 1 1 1 88 88 1 1 1 1 1 1 96 96 96 96 96 96 96 96 96 96 96 96 96 96 96 96 ...
output:
60
result:
ok 1 number(s): "60"
Test #23:
score: 0
Accepted
time: 12ms
memory: 9572kb
input:
100000 1 2 3 3 5 6 7 8 9 10 11 12 10 14 14 16 17 18 19 19 21 21 23 23 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 39 41 42 41 44 44 46 47 37 49 50 51 49 49 54 55 55 57 58 59 60 60 62 63 64 64 64 62 62 62 70 70 72 62 74 62 76 77 78 79 76 81 82 83 76 76 86 87 88 88 90 88 88 93 62 95 59 59 98 98 100 1...
output:
16927
result:
ok 1 number(s): "16927"
Test #24:
score: 0
Accepted
time: 18ms
memory: 9440kb
input:
100000 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 15 17 18 19 20 21 22 23 24 25 20 27 27 29 30 31 30 27 34 34 36 19 38 39 40 41 39 43 44 43 46 46 48 48 48 51 52 53 53 55 56 57 58 59 60 61 62 62 64 65 66 62 68 69 70 71 72 73 73 75 76 77 78 79 77 76 82 83 84 85 84 87 82 82 76 91 92 93 92 95 91 97 98 98 100 1...
output:
16621
result:
ok 1 number(s): "16621"
Test #25:
score: 0
Accepted
time: 22ms
memory: 9536kb
input:
100000 1 2 3 4 5 6 7 8 9 10 11 12 11 14 15 16 17 18 19 20 20 22 23 24 24 26 27 27 29 24 31 32 33 34 35 36 37 36 39 40 40 40 40 44 44 46 47 47 49 49 47 52 46 54 54 56 56 58 59 60 61 62 63 64 64 66 67 68 69 70 71 72 67 74 75 76 77 77 79 80 81 82 83 84 85 85 85 88 89 88 88 92 93 93 92 92 88 98 99 100 1...
output:
16484
result:
ok 1 number(s): "16484"
Test #26:
score: 0
Accepted
time: 19ms
memory: 9540kb
input:
100000 1 2 3 4 5 5 7 8 9 10 11 10 7 14 15 16 16 7 19 20 21 21 23 21 25 21 20 20 29 30 30 32 33 34 34 33 37 38 39 40 38 33 43 44 43 29 47 48 49 50 51 49 49 48 55 56 57 56 59 60 59 56 63 64 64 63 67 68 67 70 71 63 73 63 75 76 77 76 75 80 55 47 83 83 85 85 87 88 89 90 89 83 93 94 47 96 47 98 99 99 47 1...
output:
18227
result:
ok 1 number(s): "18227"
Test #27:
score: 0
Accepted
time: 22ms
memory: 9580kb
input:
100000 1 2 2 4 5 6 7 8 9 10 11 12 13 14 15 16 16 16 19 20 21 22 23 24 25 26 27 28 29 30 31 32 29 34 28 36 37 37 26 40 41 42 42 44 45 46 44 48 49 44 44 40 53 54 55 53 57 58 59 60 60 62 62 64 65 60 67 68 67 67 67 59 73 74 75 76 40 78 40 80 81 82 81 84 84 86 87 88 89 86 91 92 93 94 94 93 97 97 99 93 10...
output:
17563
result:
ok 1 number(s): "17563"
Test #28:
score: 0
Accepted
time: 21ms
memory: 9724kb
input:
100000 1 2 3 3 3 3 3 2 2 2 2 2 2 14 14 14 14 14 14 14 2 2 23 2 25 25 2 2 29 2 2 32 32 32 32 32 2 2 2 40 2 2 43 43 43 2 47 47 2 2 51 51 1 54 54 1 57 57 57 57 1 62 63 62 62 66 62 68 68 62 62 72 62 62 62 76 76 62 79 62 62 62 1 84 84 86 86 86 86 86 86 86 84 84 95 95 95 84 99 99 99 99 99 99 84 106 106 10...
output:
11610
result:
ok 1 number(s): "11610"
Test #29:
score: 0
Accepted
time: 3ms
memory: 6008kb
input:
30 1 1 1 1 2 6 7 8 9 10 10 11 12 13 14 15 15 17 18 19 20 21 22 23 24 25 26 26 26
output:
3
result:
ok 1 number(s): "3"