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답안 #164824

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
164824 2019-11-23T15:48:22 Z arnold518 경주 (Race) (IOI11_race) C++14
100 / 100
 706 ms 34328 KB 
#include "race.h"
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int MAXN = 2e5;
const int MAXK = 1e6;

int N, K;
vector<pii> adj[MAXN+10];

bool del[MAXN+10];
int sz[MAXN+10], ans=987654321;

void getsz(int now, int bef)
{
    sz[now]=1;
    for(auto nxt : adj[now])
    {
        if(nxt.first==bef) continue;
        if(del[nxt.first]) continue;
        getsz(nxt.first, now);
        sz[now]+=sz[nxt.first];
    }
}

int getcen(int now, int bef, int tot)
{
    for(auto nxt : adj[now])
    {
        if(nxt.first==bef) continue;
        if(del[nxt.first]) continue;
        if(sz[nxt.first]>tot/2) return getcen(nxt.first, now, tot);
    }
    return now;
}

int M[MAXK+10];
vector<int> V;

void dfs1(int now, int bef, ll dist, int road)
{
    if(K-dist>=0) ans=min(ans, M[K-dist]+road);
    for(auto nxt : adj[now])
    {
        if(nxt.first==bef) continue;
        if(del[nxt.first]) continue;
        dfs1(nxt.first, now, dist+nxt.second, road+1);
    }
}

void dfs2(int now, int bef, ll dist, int road)
{
    if(dist<=K) M[dist]=min(M[dist], road), V.push_back(dist);
    for(auto nxt : adj[now])
    {
        if(nxt.first==bef) continue;
        if(del[nxt.first]) continue;
        dfs2(nxt.first, now, dist+nxt.second, road+1);
    }
}

void decomp(int now)
{
    getsz(now, now);
    now=getcen(now, now, sz[now]);
    del[now]=true;

    M[0]=0; V.clear();
    for(auto nxt : adj[now])
    {
        if(del[nxt.first]) continue;
        dfs1(nxt.first, nxt.first, nxt.second, 1);
        dfs2(nxt.first, nxt.first, nxt.second, 1);
    }
    for(auto it : V) M[it]=987654321;

    for(auto nxt : adj[now])
    {
        if(del[nxt.first]) continue;
        decomp(nxt.first);
    }
}

int best_path(int _N, int _K, int H[][2], int L[])
{
    int i, j;
    N=_N; K=_K;
    for(i=0; i<N-1; i++)
    {
        int u, v, w;
        u=H[i][0]+1; v=H[i][1]+1; w=L[i];
        adj[u].push_back({v, w});
        adj[v].push_back({u, w});
    }

    for(i=0; i<=K; i++) M[i]=987654321;
    decomp(1);
    if(ans==987654321) ans=-1;
    return ans;
}

Compilation message

race.cpp: In function 'int best_path(int, int, int (*)[2], int*)':
race.cpp:90:12: warning: unused variable 'j' [-Wunused-variable]
     int i, j;
            ^

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 5112 KB Output is correct
2 Correct 6 ms 4984 KB Output is correct
3 Correct 7 ms 5116 KB Output is correct
4 Correct 6 ms 4984 KB Output is correct
5 Correct 6 ms 4984 KB Output is correct
6 Correct 7 ms 5112 KB Output is correct
7 Correct 6 ms 4984 KB Output is correct
8 Correct 6 ms 4984 KB Output is correct
9 Correct 6 ms 4984 KB Output is correct
10 Correct 7 ms 5112 KB Output is correct
11 Correct 7 ms 5112 KB Output is correct
12 Correct 6 ms 4984 KB Output is correct
13 Correct 6 ms 4984 KB Output is correct
14 Correct 6 ms 5112 KB Output is correct
15 Correct 6 ms 4984 KB Output is correct
16 Correct 6 ms 4984 KB Output is correct
17 Correct 6 ms 5112 KB Output is correct
18 Correct 6 ms 4984 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 5112 KB Output is correct
2 Correct 6 ms 4984 KB Output is correct
3 Correct 7 ms 5116 KB Output is correct
4 Correct 6 ms 4984 KB Output is correct
5 Correct 6 ms 4984 KB Output is correct
6 Correct 7 ms 5112 KB Output is correct
7 Correct 6 ms 4984 KB Output is correct
8 Correct 6 ms 4984 KB Output is correct
9 Correct 6 ms 4984 KB Output is correct
10 Correct 7 ms 5112 KB Output is correct
11 Correct 7 ms 5112 KB Output is correct
12 Correct 6 ms 4984 KB Output is correct
13 Correct 6 ms 4984 KB Output is correct
14 Correct 6 ms 5112 KB Output is correct
15 Correct 6 ms 4984 KB Output is correct
16 Correct 6 ms 4984 KB Output is correct
17 Correct 6 ms 5112 KB Output is correct
18 Correct 6 ms 4984 KB Output is correct
19 Correct 6 ms 5112 KB Output is correct
20 Correct 7 ms 5112 KB Output is correct
21 Correct 7 ms 5112 KB Output is correct
22 Correct 10 ms 8696 KB Output is correct
23 Correct 10 ms 8056 KB Output is correct
24 Correct 10 ms 8440 KB Output is correct
25 Correct 10 ms 8440 KB Output is correct
26 Correct 25 ms 6392 KB Output is correct
27 Correct 10 ms 8184 KB Output is correct
28 Correct 8 ms 5880 KB Output is correct
29 Correct 9 ms 6392 KB Output is correct
30 Correct 9 ms 6520 KB Output is correct
31 Correct 9 ms 7644 KB Output is correct
32 Correct 10 ms 8028 KB Output is correct
33 Correct 22 ms 8208 KB Output is correct
34 Correct 10 ms 7416 KB Output is correct
35 Correct 10 ms 8312 KB Output is correct
36 Correct 11 ms 8824 KB Output is correct
37 Correct 10 ms 8188 KB Output is correct
38 Correct 9 ms 7160 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 5112 KB Output is correct
2 Correct 6 ms 4984 KB Output is correct
3 Correct 7 ms 5116 KB Output is correct
4 Correct 6 ms 4984 KB Output is correct
5 Correct 6 ms 4984 KB Output is correct
6 Correct 7 ms 5112 KB Output is correct
7 Correct 6 ms 4984 KB Output is correct
8 Correct 6 ms 4984 KB Output is correct
9 Correct 6 ms 4984 KB Output is correct
10 Correct 7 ms 5112 KB Output is correct
11 Correct 7 ms 5112 KB Output is correct
12 Correct 6 ms 4984 KB Output is correct
13 Correct 6 ms 4984 KB Output is correct
14 Correct 6 ms 5112 KB Output is correct
15 Correct 6 ms 4984 KB Output is correct
16 Correct 6 ms 4984 KB Output is correct
17 Correct 6 ms 5112 KB Output is correct
18 Correct 6 ms 4984 KB Output is correct
19 Correct 189 ms 10488 KB Output is correct
20 Correct 198 ms 10504 KB Output is correct
21 Correct 184 ms 10744 KB Output is correct
22 Correct 170 ms 11144 KB Output is correct
23 Correct 149 ms 10668 KB Output is correct
24 Correct 93 ms 10460 KB Output is correct
25 Correct 230 ms 14712 KB Output is correct
26 Correct 130 ms 18040 KB Output is correct
27 Correct 261 ms 19016 KB Output is correct
28 Correct 602 ms 30200 KB Output is correct
29 Correct 674 ms 29432 KB Output is correct
30 Correct 272 ms 18880 KB Output is correct
31 Correct 269 ms 19052 KB Output is correct
32 Correct 349 ms 19064 KB Output is correct
33 Correct 479 ms 17816 KB Output is correct
34 Correct 501 ms 18680 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 5112 KB Output is correct
2 Correct 6 ms 4984 KB Output is correct
3 Correct 7 ms 5116 KB Output is correct
4 Correct 6 ms 4984 KB Output is correct
5 Correct 6 ms 4984 KB Output is correct
6 Correct 7 ms 5112 KB Output is correct
7 Correct 6 ms 4984 KB Output is correct
8 Correct 6 ms 4984 KB Output is correct
9 Correct 6 ms 4984 KB Output is correct
10 Correct 7 ms 5112 KB Output is correct
11 Correct 7 ms 5112 KB Output is correct
12 Correct 6 ms 4984 KB Output is correct
13 Correct 6 ms 4984 KB Output is correct
14 Correct 6 ms 5112 KB Output is correct
15 Correct 6 ms 4984 KB Output is correct
16 Correct 6 ms 4984 KB Output is correct
17 Correct 6 ms 5112 KB Output is correct
18 Correct 6 ms 4984 KB Output is correct
19 Correct 6 ms 5112 KB Output is correct
20 Correct 7 ms 5112 KB Output is correct
21 Correct 7 ms 5112 KB Output is correct
22 Correct 10 ms 8696 KB Output is correct
23 Correct 10 ms 8056 KB Output is correct
24 Correct 10 ms 8440 KB Output is correct
25 Correct 10 ms 8440 KB Output is correct
26 Correct 25 ms 6392 KB Output is correct
27 Correct 10 ms 8184 KB Output is correct
28 Correct 8 ms 5880 KB Output is correct
29 Correct 9 ms 6392 KB Output is correct
30 Correct 9 ms 6520 KB Output is correct
31 Correct 9 ms 7644 KB Output is correct
32 Correct 10 ms 8028 KB Output is correct
33 Correct 22 ms 8208 KB Output is correct
34 Correct 10 ms 7416 KB Output is correct
35 Correct 10 ms 8312 KB Output is correct
36 Correct 11 ms 8824 KB Output is correct
37 Correct 10 ms 8188 KB Output is correct
38 Correct 9 ms 7160 KB Output is correct
39 Correct 189 ms 10488 KB Output is correct
40 Correct 198 ms 10504 KB Output is correct
41 Correct 184 ms 10744 KB Output is correct
42 Correct 170 ms 11144 KB Output is correct
43 Correct 149 ms 10668 KB Output is correct
44 Correct 93 ms 10460 KB Output is correct
45 Correct 230 ms 14712 KB Output is correct
46 Correct 130 ms 18040 KB Output is correct
47 Correct 261 ms 19016 KB Output is correct
48 Correct 602 ms 30200 KB Output is correct
49 Correct 674 ms 29432 KB Output is correct
50 Correct 272 ms 18880 KB Output is correct
51 Correct 269 ms 19052 KB Output is correct
52 Correct 349 ms 19064 KB Output is correct
53 Correct 479 ms 17816 KB Output is correct
54 Correct 501 ms 18680 KB Output is correct
55 Correct 19 ms 5880 KB Output is correct
56 Correct 18 ms 5752 KB Output is correct
57 Correct 95 ms 12508 KB Output is correct
58 Correct 48 ms 12652 KB Output is correct
59 Correct 129 ms 18680 KB Output is correct
60 Correct 706 ms 34328 KB Output is correct
61 Correct 253 ms 19324 KB Output is correct
62 Correct 273 ms 23820 KB Output is correct
63 Correct 341 ms 23852 KB Output is correct
64 Correct 608 ms 22324 KB Output is correct
65 Correct 423 ms 19844 KB Output is correct
66 Correct 692 ms 31448 KB Output is correct
67 Correct 148 ms 25444 KB Output is correct
68 Correct 363 ms 24040 KB Output is correct
69 Correct 385 ms 24184 KB Output is correct
70 Correct 344 ms 23388 KB Output is correct