oj.uz

Submission #114916

# Submission time Handle Problem Language Result Execution time Memory
114916 2019-06-03T22:34:50 Z tutis Highway Tolls (IOI18_highway) C++17
51 / 100
 804 ms 14696 KB 
#include <bits/stdc++.h>
#include "highway.h"
using namespace std;
typedef long long ll;
void find_pair(int N, std::vector<int> U, std::vector<int> V, int A, int B)
{
	vector<int>adj[N];
	int M = U.size();
	for (int i = 0; i < M; i++)
	{
		adj[U[i]].push_back(V[i]);
		adj[V[i]].push_back(U[i]);
	}
	vector<int>tarp;
	for (int i = 0; i < M; i++)
		tarp.push_back(i);
	vector<int>w(M, 1);
	ll maxi = ask(w);
	while (tarp.size() > 1)
	{
		vector<int>t1;
		vector<int>t2;
		for (int i = 0; i < tarp.size(); i++)
		{
			if (i < tarp.size() / 2)
				t1.push_back(tarp[i]);
			else
				t2.push_back(tarp[i]);
		}
		fill_n(w.begin(), M, 1);
		for (int i : t1)
			w[i] = 0;
		if (ask(w) < maxi)
			tarp = t1;
		else
			tarp = t2;
	}
	assert(tarp.size() == 1);
	int u = U[tarp[0]];
	int v = V[tarp[0]];
	int s = u;
	int t = v;
	for (pair<int, int>ab : {make_pair(u, v), make_pair(v, u)})
	{
		int a = ab.first;
		int b = ab.second;
		int d[N];
		fill_n(d, N, N + 3);
		d[a] = 0;
		function<void(int, int)>dfs = [&](int i, int p)
		{
			for (int j : adj[i])
			{
				if (j == p || d[j] <= d[i])
					continue;
				d[j] = d[i] + 1;
				dfs(j, i);
			}
		};
		dfs(a, b);
		int pa[N];
		fill_n(pa, N, -1);
		for (int i = 0; i < M; i++)
		{
			if (d[U[i]] > d[V[i]])
				swap(U[i], V[i]);
			if (d[V[i]] < N + 3)
			{
				pa[V[i]] = i;
			}
		}
		fill_n(w.begin(), M, 1);
		for (int i = 0; i < N; i++)
		{
			if (pa[i] != -1)
			{
				w[pa[i]] = 0;
			}
		}
		int de = (maxi - ask(w)) / (ll(B - A));
		vector<int>X;
		for (int i = 0; i < N; i++)
			if (d[i] == de)
				X.push_back(i);
		while (X.size() > 1)
		{
			vector<int>x1;
			vector<int>x2;
			for (int i = 0; i < X.size(); i++)
			{
				if (i < X.size() / 2)
					x1.push_back(X[i]);
				else
					x2.push_back(X[i]);
			}
			fill_n(w.begin(), M, 1);
			for (int i : x1)
				w[pa[i]] = 0;
			if (ask(w) < maxi)
				X = x1;
			else
				X = x2;
		}
		if (a == u)
			s = X[0];
		else
			t = X[0];
	}
	answer(s, t);
}/*
int main()
{

}
/**/

Compilation message

highway.cpp:115:1: warning: "/*" within comment [-Wcomment]
 /**/
  
highway.cpp: In function 'void find_pair(int, std::vector<int>, std::vector<int>, int, int)':
highway.cpp:23:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int i = 0; i < tarp.size(); i++)
                   ~~^~~~~~~~~~~~~
highway.cpp:25:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    if (i < tarp.size() / 2)
        ~~^~~~~~~~~~~~~~~~~
highway.cpp:89:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for (int i = 0; i < X.size(); i++)
                    ~~^~~~~~~~~~
highway.cpp:91:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if (i < X.size() / 2)
         ~~^~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 248 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 276 KB Output is correct
5 Correct 2 ms 248 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 248 KB Output is correct
8 Correct 2 ms 248 KB Output is correct
9 Correct 2 ms 248 KB Output is correct
10 Correct 2 ms 376 KB Output is correct
11 Correct 2 ms 320 KB Output is correct
12 Correct 2 ms 248 KB Output is correct

Subtask #2
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 376 KB Output is correct
2 Correct 19 ms 1156 KB Output is correct
3 Correct 198 ms 8508 KB Output is correct
4 Correct 186 ms 8608 KB Output is correct
5 Correct 183 ms 8492 KB Output is correct
6 Correct 204 ms 8496 KB Output is correct
7 Correct 193 ms 8500 KB Output is correct
8 Correct 190 ms 8508 KB Output is correct
9 Correct 177 ms 8564 KB Output is correct
10 Correct 185 ms 8532 KB Output is correct
11 Correct 184 ms 9364 KB Output is correct
12 Correct 187 ms 10332 KB Output is correct
13 Correct 187 ms 9792 KB Output is correct
14 Correct 194 ms 9868 KB Output is correct

Subtask #3
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 41 ms 1856 KB Output is correct
2 Correct 38 ms 3388 KB Output is correct
3 Correct 55 ms 4992 KB Output is correct
4 Correct 186 ms 12344 KB Output is correct
5 Correct 162 ms 12452 KB Output is correct
6 Correct 171 ms 13652 KB Output is correct
7 Correct 158 ms 14696 KB Output is correct
8 Correct 174 ms 12900 KB Output is correct
9 Correct 156 ms 13268 KB Output is correct

Subtask #4
33.0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 392 KB Output is correct
2 Correct 18 ms 1280 KB Output is correct
3 Correct 117 ms 6740 KB Output is correct
4 Correct 179 ms 8524 KB Output is correct
5 Correct 194 ms 8500 KB Output is correct
6 Correct 178 ms 8512 KB Output is correct
7 Correct 196 ms 8492 KB Output is correct
8 Correct 188 ms 8480 KB Output is correct
9 Correct 177 ms 8516 KB Output is correct
10 Correct 184 ms 8524 KB Output is correct
11 Correct 198 ms 9508 KB Output is correct
12 Correct 217 ms 10344 KB Output is correct
13 Correct 196 ms 10032 KB Output is correct
14 Correct 181 ms 9884 KB Output is correct
15 Correct 192 ms 8504 KB Output is correct
16 Correct 170 ms 8436 KB Output is correct
17 Correct 202 ms 9628 KB Output is correct
18 Correct 191 ms 10092 KB Output is correct
19 Correct 174 ms 8516 KB Output is correct
20 Correct 202 ms 10680 KB Output is correct
21 Correct 159 ms 9396 KB Output is correct
22 Correct 175 ms 9420 KB Output is correct
23 Correct 205 ms 8980 KB Output is correct
24 Correct 178 ms 9048 KB Output is correct
25 Correct 210 ms 14184 KB Output is correct

Subtask #5
0 / 18.0

# Verdict Execution time Memory Grader output
1 Incorrect 796 ms 1404 KB Output is incorrect: {s, t} is wrong.
2 Halted 0 ms 0 KB -

Subtask #6
0 / 31.0

# Verdict Execution time Memory Grader output
1 Incorrect 804 ms 1424 KB Output is incorrect: {s, t} is wrong.
2 Halted 0 ms 0 KB -