oj.uz

Submission #315238

# Submission time Handle Problem Language Result Execution time Memory
315238 2020-10-22T06:08:44 Z shrek12357 Triumphal arch (POI13_luk) C++14
30 / 100
 1279 ms 22776 KB 
#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
#include <map>
#include <set>
#include <climits>
#include <cmath>
#include <fstream>
#include <queue>
#include <stack>
#include <bitset>
using namespace std;
#define ll long long
//cin.tie(0);ios_base::sync_with_stdio(0); 

const int MAXN = 3 * 1e5 + 5;
vector<int> adjList[MAXN];
int par[MAXN];
int n;
bool good;

void dfs(int src) {
	for (auto i : adjList[src]) {
		if (i == par[src]) {
			continue;
		}
		par[i] = src;
		dfs(i);
	}
}

void check(int src, int mid, int val) {
	val += mid;
	val -= adjList[src].size();
	if (src != 0) {
		val++;
	}
	if (val < 0) {
		good = false;
	}
	for (auto i : adjList[src]) {
		if (i == par[src]) {
			continue;
		}
		check(i, mid, val);
	}
}

int main() {
	cin >> n;
	par[0] = 0;
	for (int i = 0; i < n - 1; i++) {
		int a, b;
		cin >> a >> b;
		a--;
		b--;
		adjList[a].push_back(b);
		adjList[b].push_back(a);
	}
	dfs(0);
	int lo = 0, hi = n;
	while (lo < hi) {
		int mid = (lo + hi) / 2;
		good = true;
		check(0, mid, 0);
		if (good) {
			hi = mid;
		}
		else {
			lo = mid + 1;
		}
	}
	cout << lo << endl;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 7424 KB Output is correct
2 Correct 5 ms 7424 KB Output is correct
3 Correct 5 ms 7424 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 7424 KB Output is correct
2 Correct 5 ms 7296 KB Output is correct
3 Correct 5 ms 7424 KB Output is correct
4 Correct 5 ms 7424 KB Output is correct
5 Correct 5 ms 7416 KB Output is correct

Subtask #3
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 7424 KB Output is correct
2 Correct 5 ms 7296 KB Output is correct
3 Correct 5 ms 7296 KB Output is correct

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 6 ms 7456 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 19 ms 7808 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 57 ms 8824 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 279 ms 12312 KB Output is correct
2 Correct 283 ms 13816 KB Output is correct
3 Incorrect 155 ms 12536 KB Output isn't correct

Subtask #8
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 786 ms 17272 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #9
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1278 ms 22520 KB Output isn't correct

Subtask #10
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1279 ms 22776 KB Output isn't correct
2 Halted 0 ms 0 KB -