oj.uz

Submission #118753

# Submission time Handle Problem Language Result Execution time Memory
118753 2019-06-19T16:22:30 Z Sorting Highway Tolls (IOI18_highway) C++14
0 / 100
 360 ms 262148 KB 
#include <bits/stdc++.h>
#include "highway.h"

using namespace std;

const int MAXN = 1e5 + 7;

mt19937 mt();

long long n, m;
vector<int> adj[MAXN], idx[MAXN], w;
vector<pair<int, int> > e;
int depth[MAXN];

void dfs(int u, int pr = -1, int d = 0){
	depth[u] = d;
	for(int i = 0; i < adj[u].size(); i++){
		int to = adj[u][i], j = idx[u][i];

		if(to == pr){
			continue;
		}

		e.push_back({d + 1, j});
		dfs(to, u, d + 1);
	}
}

void find_pair(int N, vector<int> U, vector<int> V, int A, int B){
	n = N;
	m = U.size();

	for(int i = 0; i < m; i++){
		adj[V[i]].push_back(U[i]);
		adj[U[i]].push_back(V[i]);

		idx[V[i]].push_back(i);
		idx[U[i]].push_back(i);
		w.push_back(0);
	}

	long long a = A, b = B;
	long long sm = ask(w);

	dfs(0);

	sort(e.begin(), e.end());

	int l = 0, r = m;

	while(l != r){
		int mid = (l + r) / 2;

		for(int i = 0; i < m; i++){
			w[i] = 0;
		}
		for(int i = mid + 1; i <= r; i++){
			w[e[i].second] = true;
		}

		long long score = ask(w);
		score -= sm;

		if(score){
			l = mid + 1;
		}
		else{
			r = mid;
		}
	}

	int x = V[l], y = U[l];

	if(depth[x] < depth[y]){
		swap(x, y);
	}

	answer(0, x);
}

/*
9 1 2
4 8
4 2
8 0
2 5
2 7
2 3
0 1
0 6
*/

Compilation message

highway.cpp: In function 'void dfs(int, int, int)':
highway.cpp:17:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0; i < adj[u].size(); i++){
                 ~~^~~~~~~~~~~~~~~
highway.cpp: In function 'void find_pair(int, std::vector<int>, std::vector<int>, int, int)':
highway.cpp:42:12: warning: unused variable 'a' [-Wunused-variable]
  long long a = A, b = B;
            ^
highway.cpp:42:19: warning: unused variable 'b' [-Wunused-variable]
  long long a = A, b = B;
                   ^

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 6 ms 4984 KB Output is incorrect: {s, t} is wrong.
2 Halted 0 ms 0 KB -

Subtask #2
0 / 7.0

# Verdict Execution time Memory Grader output
1 Incorrect 7 ms 5112 KB Output is incorrect: {s, t} is wrong.
2 Halted 0 ms 0 KB -

Subtask #3
0 / 6.0

# Verdict Execution time Memory Grader output
1 Incorrect 25 ms 7032 KB Output is incorrect: {s, t} is wrong.
2 Halted 0 ms 0 KB -

Subtask #4
0 / 33.0

# Verdict Execution time Memory Grader output
1 Incorrect 7 ms 5180 KB Output is incorrect: {s, t} is wrong.
2 Halted 0 ms 0 KB -

Subtask #5
0 / 18.0

# Verdict Execution time Memory Grader output
1 Runtime error 360 ms 262148 KB Execution killed with signal 9 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -

Subtask #6
0 / 31.0

# Verdict Execution time Memory Grader output
1 Runtime error 352 ms 262148 KB Execution killed with signal 9 (could be triggered by violating memory limits)
2 Halted 0 ms 0 KB -