#include <iostream>
#include <algorithm>
#include <vector>
#include <set>
#define avg(a ,b) ((a + b) / 2)
using namespace std;
vector<vector<int>> map_of_cities;
int num_not_satisfy(set<int> & visited_set, int num_workers, int city)
{
int i, child_city, children = map_of_cities[city].size(), rec_res, num_children = 0;
visited_set.insert(city);
for (i = 0, rec_res = 0; i < children; i++) {
child_city = map_of_cities[city][i];
if (visited_set.find(child_city) == visited_set.end()) {
num_children++;
rec_res += num_not_satisfy(visited_set, num_workers, child_city);
}
}
if (num_children + rec_res < num_workers) {
return 0;
} else {
return num_children + rec_res - num_workers;
}
}
int main()
{
int n, i, res, bsearch_start, bsearch_end, bsearch_mid, road_from, road_to;
cin >> n;
for (i = 0; i < n; i++) {
vector<int> temp;
map_of_cities.push_back(temp);
}
for (i = 1; i < n; i++) {
cin >> road_from >> road_to;
map_of_cities[road_from - 1].push_back(road_to - 1);
map_of_cities[road_to - 1].push_back(road_from - 1);
}
bsearch_start = 0, bsearch_end = n;
for (; bsearch_start < bsearch_end; ) {
bsearch_mid = avg(bsearch_start, bsearch_end);
set<int> visited_set;
res = num_not_satisfy(visited_set, bsearch_mid, 0);
if (res != 0) {
bsearch_start = bsearch_mid + 1;
} else {
bsearch_end = bsearch_mid;
}
}
res = bsearch_start;
cout << res << endl;
return 0;
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
2 ms |
256 KB |
Output is correct |
2 |
Correct |
2 ms |
500 KB |
Output is correct |
3 |
Correct |
2 ms |
500 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
2 ms |
500 KB |
Output is correct |
2 |
Correct |
2 ms |
500 KB |
Output is correct |
3 |
Correct |
2 ms |
500 KB |
Output is correct |
4 |
Correct |
2 ms |
500 KB |
Output is correct |
5 |
Correct |
2 ms |
520 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
3 ms |
520 KB |
Output is correct |
2 |
Correct |
2 ms |
520 KB |
Output is correct |
3 |
Correct |
3 ms |
576 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
6 ms |
580 KB |
Output is correct |
2 |
Correct |
6 ms |
584 KB |
Output is correct |
3 |
Correct |
5 ms |
588 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
88 ms |
1612 KB |
Output is correct |
2 |
Correct |
81 ms |
2028 KB |
Output is correct |
3 |
Correct |
68 ms |
2028 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
367 ms |
3928 KB |
Output is correct |
2 |
Correct |
351 ms |
5368 KB |
Output is correct |
3 |
Correct |
249 ms |
5368 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1760 ms |
11856 KB |
Output is correct |
2 |
Correct |
1831 ms |
15356 KB |
Output is correct |
3 |
Correct |
1295 ms |
15356 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Execution timed out |
2052 ms |
24520 KB |
Time limit exceeded |
2 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Execution timed out |
2086 ms |
34872 KB |
Time limit exceeded |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Execution timed out |
2051 ms |
34896 KB |
Time limit exceeded |
2 |
Halted |
0 ms |
0 KB |
- |