oj.uz

Submission #941963

# Submission time Handle Problem Language Result Execution time Memory
941963 2024-03-09T20:32:33 Z 4QT0R Race (IOI11_race) C++17
100 / 100
 669 ms 43996 KB 
#include <bits/stdc++.h>
using namespace std;

vector<pair<int,int>> graph[200004];
bool usun[200004];
int siz[200004];
int ans=200004;
map<int,int> mp;
int dlugosc;

void prep(int v, int p){
	siz[v]=1;
	for (auto u : graph[v]){
		if (u.first==p || usun[u.first])continue;
		prep(u.first,v);
		siz[v]+=siz[u.first];
	}
}

int find_centr(int v, int p, int n){
	int mx_pod=0,mx_son;
	for (auto u : graph[v]){
		if (u.first==p || usun[u.first])continue;
		if (mx_pod<siz[u.first]){
			mx_son=u.first;
			mx_pod=siz[u.first];
		};
	}
	if (mx_pod*2>n)return find_centr(mx_son,v,n);
	else return v;
}

void dfs1(int v, int p, int odl, int dist){
	if (mp.find(dlugosc-odl)!=mp.end())ans=min(ans,mp[dlugosc-odl]+dist);
	for (auto u : graph[v]){
		if (u.first==p || usun[u.first])continue;
		dfs1(u.first,v,odl+u.second,dist+1);
	}
}

void dfs2(int v, int p, int odl, int dist){
	for (auto u : graph[v]){
		if (u.first==p || usun[u.first])continue;
		dfs2(u.first,v,odl+u.second,dist+1);
	}
	if (mp.find(odl)==mp.end())mp[odl]=dist;
	else mp[odl]=min(mp[odl],dist);
}

void dekomp(int v){
	prep(v,-1);
	int centr=find_centr(v,-1,siz[v]);
	usun[centr]=true;
	mp.clear();
	for (auto u : graph[centr]){
		if (usun[u.first])continue;
		dfs1(u.first,centr,u.second,1);
		dfs2(u.first,centr,u.second,1);
	}
	if (mp.find(dlugosc)!=mp.end())ans=min(ans,mp[dlugosc]);
	for (auto u : graph[centr]){
		if (usun[u.first])continue;
		dekomp(u.first);
	}
}

int best_path(int n, int k, int h[][2], int l[]){
	dlugosc=k;
	for (int i = 0; i<n-1; i++){
		graph[h[i][0]].push_back({h[i][1],l[i]});
		graph[h[i][1]].push_back({h[i][0],l[i]});
	}
	dekomp(0);
	if (ans>200000)return -1;
	return ans;
}

Compilation message

race.cpp: In function 'int find_centr(int, int, int)':
race.cpp:21:15: warning: 'mx_son' may be used uninitialized in this function [-Wmaybe-uninitialized]
   21 |  int mx_pod=0,mx_son;
      |               ^~~~~~
race.cpp: In function 'void dekomp(int)':
race.cpp:58:7: warning: 'mx_son' may be used uninitialized in this function [-Wmaybe-uninitialized]
   58 |   dfs2(u.first,centr,u.second,1);
      |   ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 9560 KB Output is correct
2 Correct 2 ms 9564 KB Output is correct
3 Correct 2 ms 9564 KB Output is correct
4 Correct 2 ms 9520 KB Output is correct
5 Correct 2 ms 9564 KB Output is correct
6 Correct 2 ms 9560 KB Output is correct
7 Correct 2 ms 9560 KB Output is correct
8 Correct 3 ms 9564 KB Output is correct
9 Correct 2 ms 9564 KB Output is correct
10 Correct 2 ms 9564 KB Output is correct
11 Correct 2 ms 9560 KB Output is correct
12 Correct 2 ms 9656 KB Output is correct
13 Correct 2 ms 9564 KB Output is correct
14 Correct 2 ms 9564 KB Output is correct
15 Correct 2 ms 9564 KB Output is correct
16 Correct 2 ms 9564 KB Output is correct
17 Correct 2 ms 9564 KB Output is correct
18 Correct 2 ms 9560 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 9560 KB Output is correct
2 Correct 2 ms 9564 KB Output is correct
3 Correct 2 ms 9564 KB Output is correct
4 Correct 2 ms 9520 KB Output is correct
5 Correct 2 ms 9564 KB Output is correct
6 Correct 2 ms 9560 KB Output is correct
7 Correct 2 ms 9560 KB Output is correct
8 Correct 3 ms 9564 KB Output is correct
9 Correct 2 ms 9564 KB Output is correct
10 Correct 2 ms 9564 KB Output is correct
11 Correct 2 ms 9560 KB Output is correct
12 Correct 2 ms 9656 KB Output is correct
13 Correct 2 ms 9564 KB Output is correct
14 Correct 2 ms 9564 KB Output is correct
15 Correct 2 ms 9564 KB Output is correct
16 Correct 2 ms 9564 KB Output is correct
17 Correct 2 ms 9564 KB Output is correct
18 Correct 2 ms 9560 KB Output is correct
19 Correct 2 ms 9564 KB Output is correct
20 Correct 2 ms 9564 KB Output is correct
21 Correct 3 ms 9656 KB Output is correct
22 Correct 3 ms 9816 KB Output is correct
23 Correct 3 ms 9820 KB Output is correct
24 Correct 3 ms 9820 KB Output is correct
25 Correct 3 ms 9820 KB Output is correct
26 Correct 3 ms 9820 KB Output is correct
27 Correct 2 ms 9564 KB Output is correct
28 Correct 3 ms 9820 KB Output is correct
29 Correct 3 ms 9820 KB Output is correct
30 Correct 3 ms 9820 KB Output is correct
31 Correct 3 ms 9816 KB Output is correct
32 Correct 3 ms 9820 KB Output is correct
33 Correct 3 ms 9744 KB Output is correct
34 Correct 4 ms 9820 KB Output is correct
35 Correct 3 ms 9820 KB Output is correct
36 Correct 3 ms 9820 KB Output is correct
37 Correct 3 ms 9840 KB Output is correct
38 Correct 3 ms 9820 KB Output is correct

Subtask #3
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 9560 KB Output is correct
2 Correct 2 ms 9564 KB Output is correct
3 Correct 2 ms 9564 KB Output is correct
4 Correct 2 ms 9520 KB Output is correct
5 Correct 2 ms 9564 KB Output is correct
6 Correct 2 ms 9560 KB Output is correct
7 Correct 2 ms 9560 KB Output is correct
8 Correct 3 ms 9564 KB Output is correct
9 Correct 2 ms 9564 KB Output is correct
10 Correct 2 ms 9564 KB Output is correct
11 Correct 2 ms 9560 KB Output is correct
12 Correct 2 ms 9656 KB Output is correct
13 Correct 2 ms 9564 KB Output is correct
14 Correct 2 ms 9564 KB Output is correct
15 Correct 2 ms 9564 KB Output is correct
16 Correct 2 ms 9564 KB Output is correct
17 Correct 2 ms 9564 KB Output is correct
18 Correct 2 ms 9560 KB Output is correct
19 Correct 167 ms 15628 KB Output is correct
20 Correct 162 ms 15444 KB Output is correct
21 Correct 156 ms 15812 KB Output is correct
22 Correct 134 ms 15704 KB Output is correct
23 Correct 210 ms 15708 KB Output is correct
24 Correct 103 ms 15956 KB Output is correct
25 Correct 143 ms 19800 KB Output is correct
26 Correct 81 ms 22708 KB Output is correct
27 Correct 203 ms 19540 KB Output is correct
28 Correct 614 ms 43348 KB Output is correct
29 Correct 641 ms 43996 KB Output is correct
30 Correct 213 ms 21856 KB Output is correct
31 Correct 213 ms 22100 KB Output is correct
32 Correct 227 ms 21780 KB Output is correct
33 Correct 366 ms 20768 KB Output is correct
34 Correct 562 ms 30308 KB Output is correct

Subtask #4
57.0 / 57.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 9560 KB Output is correct
2 Correct 2 ms 9564 KB Output is correct
3 Correct 2 ms 9564 KB Output is correct
4 Correct 2 ms 9520 KB Output is correct
5 Correct 2 ms 9564 KB Output is correct
6 Correct 2 ms 9560 KB Output is correct
7 Correct 2 ms 9560 KB Output is correct
8 Correct 3 ms 9564 KB Output is correct
9 Correct 2 ms 9564 KB Output is correct
10 Correct 2 ms 9564 KB Output is correct
11 Correct 2 ms 9560 KB Output is correct
12 Correct 2 ms 9656 KB Output is correct
13 Correct 2 ms 9564 KB Output is correct
14 Correct 2 ms 9564 KB Output is correct
15 Correct 2 ms 9564 KB Output is correct
16 Correct 2 ms 9564 KB Output is correct
17 Correct 2 ms 9564 KB Output is correct
18 Correct 2 ms 9560 KB Output is correct
19 Correct 2 ms 9564 KB Output is correct
20 Correct 2 ms 9564 KB Output is correct
21 Correct 3 ms 9656 KB Output is correct
22 Correct 3 ms 9816 KB Output is correct
23 Correct 3 ms 9820 KB Output is correct
24 Correct 3 ms 9820 KB Output is correct
25 Correct 3 ms 9820 KB Output is correct
26 Correct 3 ms 9820 KB Output is correct
27 Correct 2 ms 9564 KB Output is correct
28 Correct 3 ms 9820 KB Output is correct
29 Correct 3 ms 9820 KB Output is correct
30 Correct 3 ms 9820 KB Output is correct
31 Correct 3 ms 9816 KB Output is correct
32 Correct 3 ms 9820 KB Output is correct
33 Correct 3 ms 9744 KB Output is correct
34 Correct 4 ms 9820 KB Output is correct
35 Correct 3 ms 9820 KB Output is correct
36 Correct 3 ms 9820 KB Output is correct
37 Correct 3 ms 9840 KB Output is correct
38 Correct 3 ms 9820 KB Output is correct
39 Correct 167 ms 15628 KB Output is correct
40 Correct 162 ms 15444 KB Output is correct
41 Correct 156 ms 15812 KB Output is correct
42 Correct 134 ms 15704 KB Output is correct
43 Correct 210 ms 15708 KB Output is correct
44 Correct 103 ms 15956 KB Output is correct
45 Correct 143 ms 19800 KB Output is correct
46 Correct 81 ms 22708 KB Output is correct
47 Correct 203 ms 19540 KB Output is correct
48 Correct 614 ms 43348 KB Output is correct
49 Correct 641 ms 43996 KB Output is correct
50 Correct 213 ms 21856 KB Output is correct
51 Correct 213 ms 22100 KB Output is correct
52 Correct 227 ms 21780 KB Output is correct
53 Correct 366 ms 20768 KB Output is correct
54 Correct 562 ms 30308 KB Output is correct
55 Correct 17 ms 10332 KB Output is correct
56 Correct 11 ms 10164 KB Output is correct
57 Correct 102 ms 16068 KB Output is correct
58 Correct 35 ms 16844 KB Output is correct
59 Correct 217 ms 27216 KB Output is correct
60 Correct 608 ms 43672 KB Output is correct
61 Correct 249 ms 22252 KB Output is correct
62 Correct 199 ms 21756 KB Output is correct
63 Correct 221 ms 21768 KB Output is correct
64 Correct 669 ms 24828 KB Output is correct
65 Correct 593 ms 31872 KB Output is correct
66 Correct 614 ms 39508 KB Output is correct
67 Correct 84 ms 23176 KB Output is correct
68 Correct 322 ms 29924 KB Output is correct
69 Correct 343 ms 28016 KB Output is correct
70 Correct 321 ms 29616 KB Output is correct