oj.uz

Submission #547956

# Submission time Handle Problem Language Result Execution time Memory
547956 2022-04-12T04:40:06 Z ZuZKho Race (IOI11_race) C++17
100 / 100
 423 ms 41800 KB 
#include<bits/stdc++.h>
#include "race.h"

using namespace std;

const int MAXN = 200005;
vector<pair<int,int> > g[MAXN];
vector<char> used(MAXN,0);
vector<int> sz(MAXN,0);
vector<pair<int,int> > cur(MAXN);
int Ans = 1e9;
int n,k;

const int MAXK = 1e6 + 10;
vector<int> ans(MAXK,-1);
vector<int> changed(MAXK);

int cursz = 0;
int chsz = 0;

void dfs_sizes(int v,int p) {
    sz[v] = 1;
    for(int i=0;i<g[v].size();i++) {
        int to = g[v][i].first;
        if (to==p || used[to]) continue;
        dfs_sizes(to,v);
        sz[v]+=sz[to];
    }
}

int centroid(int v,int p,int ss) {
    for(int i=0;i<g[v].size();i++) {
        int to = g[v][i].first;
        if (to==p || used[to]) continue;
        if (sz[to] > ss/2) return centroid(to,v,ss);
    }
    return v;
}

void dfs_func(int v,int p,pair<int,int> func) {
    if (func.first>k) return;
    cur[cursz++] = func;
    int len = func.first, cnt = func.second;
    for(int i=0;i<g[v].size();i++) {
        int to = g[v][i].first;
        if (to==p || used[to]) continue;
        if (len+g[v][i].second > k) return;
        dfs_func(to,v,{len+g[v][i].second,cnt+1});
    }
}


void solve(int v) {

    dfs_sizes(v,-1);
    int c = centroid(v,-1,sz[v]);
    used[c] = 1;

    ans[0] = 0;
    changed[chsz++] = 0;
    for(int i=0;i<g[c].size();i++) {
        int ch = g[c][i].first;
        if (used[ch]) continue;
        cursz = 0;
        dfs_func(ch,c,{g[c][i].second,1});

        for(int j=0;j<cursz;j++) {
            int len = cur[j].first, cnt = cur[j].second;
            if (ans[k-len]!=-1) Ans = min(Ans,ans[k-len] + cnt);
        }
        for(int j=0;j<cursz;j++) {
            int len = cur[j].first, cnt = cur[j].second;
            if (ans[len] == -1) {
                ans[len] = cnt;
                changed[chsz++] = len;
            }
            else ans[len] = min(ans[len],cnt);
        }
    }
    for(int i=0;i<chsz;i++) {
        ans[changed[i]] = -1;
    }
    chsz = 0;
    for(int i=0;i<g[c].size();i++) {
        if (!used[g[c][i].first]) solve(g[c][i].first);
    }
}


int best_path(int _n, int _k, int h[][2], int l[]) {

    n = _n;
    k = _k;
    for(int i=0;i<n-1;i++) {
        int u = h[i][0],v=h[i][1],len = l[i];
        g[u].push_back({v,len});
        g[v].push_back({u,len});
    }

    solve(0);

    if (Ans==1e9) return -1; else return Ans;
}

Compilation message

race.cpp: In function 'void dfs_sizes(int, int)':
race.cpp:23:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |     for(int i=0;i<g[v].size();i++) {
      |                 ~^~~~~~~~~~~~
race.cpp: In function 'int centroid(int, int, int)':
race.cpp:32:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |     for(int i=0;i<g[v].size();i++) {
      |                 ~^~~~~~~~~~~~
race.cpp: In function 'void dfs_func(int, int, std::pair<int, int>)':
race.cpp:44:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |     for(int i=0;i<g[v].size();i++) {
      |                 ~^~~~~~~~~~~~
race.cpp: In function 'void solve(int)':
race.cpp:61:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   61 |     for(int i=0;i<g[c].size();i++) {
      |                 ~^~~~~~~~~~~~
race.cpp:84:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   84 |     for(int i=0;i<g[c].size();i++) {
      |                 ~^~~~~~~~~~~~

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 15316 KB Output is correct
2 Correct 8 ms 15340 KB Output is correct
3 Correct 10 ms 15316 KB Output is correct
4 Correct 8 ms 15316 KB Output is correct
5 Correct 8 ms 15316 KB Output is correct
6 Correct 8 ms 15316 KB Output is correct
7 Correct 8 ms 15372 KB Output is correct
8 Correct 8 ms 15316 KB Output is correct
9 Correct 6 ms 15316 KB Output is correct
10 Correct 7 ms 15316 KB Output is correct
11 Correct 7 ms 15316 KB Output is correct
12 Correct 7 ms 15316 KB Output is correct
13 Correct 7 ms 15336 KB Output is correct
14 Correct 7 ms 15316 KB Output is correct
15 Correct 7 ms 15316 KB Output is correct
16 Correct 8 ms 15316 KB Output is correct
17 Correct 9 ms 15316 KB Output is correct
18 Correct 8 ms 15340 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 15316 KB Output is correct
2 Correct 8 ms 15340 KB Output is correct
3 Correct 10 ms 15316 KB Output is correct
4 Correct 8 ms 15316 KB Output is correct
5 Correct 8 ms 15316 KB Output is correct
6 Correct 8 ms 15316 KB Output is correct
7 Correct 8 ms 15372 KB Output is correct
8 Correct 8 ms 15316 KB Output is correct
9 Correct 6 ms 15316 KB Output is correct
10 Correct 7 ms 15316 KB Output is correct
11 Correct 7 ms 15316 KB Output is correct
12 Correct 7 ms 15316 KB Output is correct
13 Correct 7 ms 15336 KB Output is correct
14 Correct 7 ms 15316 KB Output is correct
15 Correct 7 ms 15316 KB Output is correct
16 Correct 8 ms 15316 KB Output is correct
17 Correct 9 ms 15316 KB Output is correct
18 Correct 8 ms 15340 KB Output is correct
19 Correct 8 ms 15328 KB Output is correct
20 Correct 8 ms 15316 KB Output is correct
21 Correct 7 ms 15444 KB Output is correct
22 Correct 8 ms 15444 KB Output is correct
23 Correct 8 ms 15356 KB Output is correct
24 Correct 8 ms 15444 KB Output is correct
25 Correct 8 ms 15444 KB Output is correct
26 Correct 8 ms 15444 KB Output is correct
27 Correct 9 ms 15384 KB Output is correct
28 Correct 8 ms 15444 KB Output is correct
29 Correct 9 ms 15444 KB Output is correct
30 Correct 9 ms 15444 KB Output is correct
31 Correct 8 ms 15448 KB Output is correct
32 Correct 9 ms 15444 KB Output is correct
33 Correct 9 ms 15364 KB Output is correct
34 Correct 8 ms 15444 KB Output is correct
35 Correct 8 ms 15444 KB Output is correct
36 Correct 8 ms 15444 KB Output is correct
37 Correct 8 ms 15444 KB Output is correct
38 Correct 8 ms 15328 KB Output is correct

Subtask #3
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 15316 KB Output is correct
2 Correct 8 ms 15340 KB Output is correct
3 Correct 10 ms 15316 KB Output is correct
4 Correct 8 ms 15316 KB Output is correct
5 Correct 8 ms 15316 KB Output is correct
6 Correct 8 ms 15316 KB Output is correct
7 Correct 8 ms 15372 KB Output is correct
8 Correct 8 ms 15316 KB Output is correct
9 Correct 6 ms 15316 KB Output is correct
10 Correct 7 ms 15316 KB Output is correct
11 Correct 7 ms 15316 KB Output is correct
12 Correct 7 ms 15316 KB Output is correct
13 Correct 7 ms 15336 KB Output is correct
14 Correct 7 ms 15316 KB Output is correct
15 Correct 7 ms 15316 KB Output is correct
16 Correct 8 ms 15316 KB Output is correct
17 Correct 9 ms 15316 KB Output is correct
18 Correct 8 ms 15340 KB Output is correct
19 Correct 112 ms 20116 KB Output is correct
20 Correct 111 ms 20160 KB Output is correct
21 Correct 122 ms 20308 KB Output is correct
22 Correct 123 ms 20292 KB Output is correct
23 Correct 85 ms 20400 KB Output is correct
24 Correct 58 ms 20348 KB Output is correct
25 Correct 107 ms 23804 KB Output is correct
26 Correct 87 ms 27512 KB Output is correct
27 Correct 173 ms 25292 KB Output is correct
28 Correct 248 ms 39576 KB Output is correct
29 Correct 278 ms 38348 KB Output is correct
30 Correct 157 ms 25292 KB Output is correct
31 Correct 169 ms 25368 KB Output is correct
32 Correct 218 ms 25296 KB Output is correct
33 Correct 187 ms 24140 KB Output is correct
34 Correct 179 ms 24268 KB Output is correct

Subtask #4
57.0 / 57.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 15316 KB Output is correct
2 Correct 8 ms 15340 KB Output is correct
3 Correct 10 ms 15316 KB Output is correct
4 Correct 8 ms 15316 KB Output is correct
5 Correct 8 ms 15316 KB Output is correct
6 Correct 8 ms 15316 KB Output is correct
7 Correct 8 ms 15372 KB Output is correct
8 Correct 8 ms 15316 KB Output is correct
9 Correct 6 ms 15316 KB Output is correct
10 Correct 7 ms 15316 KB Output is correct
11 Correct 7 ms 15316 KB Output is correct
12 Correct 7 ms 15316 KB Output is correct
13 Correct 7 ms 15336 KB Output is correct
14 Correct 7 ms 15316 KB Output is correct
15 Correct 7 ms 15316 KB Output is correct
16 Correct 8 ms 15316 KB Output is correct
17 Correct 9 ms 15316 KB Output is correct
18 Correct 8 ms 15340 KB Output is correct
19 Correct 8 ms 15328 KB Output is correct
20 Correct 8 ms 15316 KB Output is correct
21 Correct 7 ms 15444 KB Output is correct
22 Correct 8 ms 15444 KB Output is correct
23 Correct 8 ms 15356 KB Output is correct
24 Correct 8 ms 15444 KB Output is correct
25 Correct 8 ms 15444 KB Output is correct
26 Correct 8 ms 15444 KB Output is correct
27 Correct 9 ms 15384 KB Output is correct
28 Correct 8 ms 15444 KB Output is correct
29 Correct 9 ms 15444 KB Output is correct
30 Correct 9 ms 15444 KB Output is correct
31 Correct 8 ms 15448 KB Output is correct
32 Correct 9 ms 15444 KB Output is correct
33 Correct 9 ms 15364 KB Output is correct
34 Correct 8 ms 15444 KB Output is correct
35 Correct 8 ms 15444 KB Output is correct
36 Correct 8 ms 15444 KB Output is correct
37 Correct 8 ms 15444 KB Output is correct
38 Correct 8 ms 15328 KB Output is correct
39 Correct 112 ms 20116 KB Output is correct
40 Correct 111 ms 20160 KB Output is correct
41 Correct 122 ms 20308 KB Output is correct
42 Correct 123 ms 20292 KB Output is correct
43 Correct 85 ms 20400 KB Output is correct
44 Correct 58 ms 20348 KB Output is correct
45 Correct 107 ms 23804 KB Output is correct
46 Correct 87 ms 27512 KB Output is correct
47 Correct 173 ms 25292 KB Output is correct
48 Correct 248 ms 39576 KB Output is correct
49 Correct 278 ms 38348 KB Output is correct
50 Correct 157 ms 25292 KB Output is correct
51 Correct 169 ms 25368 KB Output is correct
52 Correct 218 ms 25296 KB Output is correct
53 Correct 187 ms 24140 KB Output is correct
54 Correct 179 ms 24268 KB Output is correct
55 Correct 18 ms 15804 KB Output is correct
56 Correct 16 ms 15892 KB Output is correct
57 Correct 79 ms 20476 KB Output is correct
58 Correct 38 ms 20408 KB Output is correct
59 Correct 98 ms 28920 KB Output is correct
60 Correct 397 ms 41800 KB Output is correct
61 Correct 168 ms 28552 KB Output is correct
62 Correct 193 ms 28236 KB Output is correct
63 Correct 259 ms 28320 KB Output is correct
64 Correct 423 ms 28528 KB Output is correct
65 Correct 241 ms 29004 KB Output is correct
66 Correct 332 ms 39088 KB Output is correct
67 Correct 114 ms 28872 KB Output is correct
68 Correct 216 ms 29056 KB Output is correct
69 Correct 247 ms 29232 KB Output is correct
70 Correct 205 ms 28416 KB Output is correct