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답안 #1049307

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1049307 2024-08-08T16:14:24 Z beaconmc 경주 (Race) (IOI11_race) C++14
100 / 100
 356 ms 108356 KB 
#include "race.h"
#include <bits/stdc++.h>
 
typedef long long ll;
#define FOR(i,x,y) for(ll i=x; i<y; i++)
#define FORNEG(i,x,y) for(ll i=x; i>y; i--)

using namespace std;

const ll maxn = 200005;
const ll INF = 1000000000;

vector<basic_string<ll>> edges[maxn];
ll par[maxn];
ll centpar[maxn];
ll depth[maxn];
ll realdepth[maxn];
ll ancc[maxn][20];
bool visited[maxn];
ll sub[maxn];
vector<array<ll,2>> idkman;
ll ans = INF;
ll KK;
ll sus[1000005];

ll anc(ll a, ll x){
    if (a==0) return 0;
    if (x==0) return par[a];
    if (ancc[a][x] != -1) return ancc[a][x];
    return ancc[a][x] = anc(anc(a,x-1),x-1);
}

ll lca(ll a, ll b){
    if (depth[a] < depth[b]) swap(a,b);
    FORNEG(i,19,-1) if (depth[anc(a, i)] >= depth[b]) a = anc(a,i);
    if (a==b) return a;
    FORNEG(i,19,-1) if (anc(a,i) != anc(b,i)) a = anc(a,i), b = anc(b,i);
    return par[a];
}

void initdfs(ll a,ll p, ll d, ll dd){
    par[a] = p;
    depth[a] = d;
    realdepth[a] = dd;
    for (auto&i : edges[a]){
        if (i[0] != p) initdfs(i[0], a, d+1, dd+i[1]);
    }
}

ll centroid(ll root, ll a, ll p){
    for (auto&i : edges[a]){
        if (!visited[i[0]] && i[0] != p && sub[i[0]] > sub[root]/2) return centroid(root, i[0], a);
    }
    return a;
}
void dfs(ll a, ll p){
    sub[a] = 1;
    for (auto&i : edges[a]){

        if(i[0] != p && !visited[i[0]]) dfs(i[0], a), sub[a] += sub[i[0]];
    }

}
void dfs2(ll a, ll p, ll d, ll dd){
    for (auto&i : edges[a]){
        if (i[0] != p && !visited[i[0]]) dfs2(i[0], a, d+1,dd + i[1]);
    }
    idkman.push_back({d, dd});
}
void build(ll a, ll p){
    dfs(a,p);
    ll cent = centroid(a, a, p);


    centpar[cent] = p;
    visited[cent] = 1;
    basic_string<ll> seen;

    sus[0] = 0;
    for (auto&i : edges[cent]){
        if (visited[i[0]]) continue;
        idkman.clear();
        dfs2(i[0], cent, 1, i[1]);
        seen.push_back(0);
        sus[0] = 0;

        for (auto&k : idkman){
            ll req = KK - k[1];

            if (0<=req && req <= KK) ans = min(ans, k[0] + sus[req]);
        }
        for (auto&k : idkman){
            seen.push_back(k[1]);
            if (0<=k[1] && k[1] <= KK) sus[k[1]] = min(sus[k[1]], k[0]);

        }
    }
    for (auto&k : seen) if (0<=k && k<=KK) sus[k] = INF;



    for (auto&i : edges[cent]){
        if (!visited[i[0]]) build(i[0], cent);
    }
}

vector<array<ll,3>> dists[maxn];

int best_path(int N, int K, int H[][2], int L[])
{
    KK = K;
    FOR(i,0,maxn) par[i] = -1, centpar[i] = -1, par[i] -1, depth[i] = -1, realdepth[i] = -1,visited[i] = 0,dists[i].clear(),edges[i].clear(), sus[i] = INF;
    FOR(i,0,maxn)FOR(j,0,20) ancc[i][j] = -1;
    FOR(i,0,1000005) sus[i] = INF;
    
    FOR(i,0,N-1){

        edges[H[i][0]].push_back({H[i][1], L[i]});
        edges[H[i][1]].push_back({H[i][0], L[i]});
    }

    
    initdfs(0,-1,0,0);
    dfs(0,-1);

    build(0,-1);




    if (ans >= INF) return -1;
    else return ans;

}

Compilation message

race.cpp: In function 'int best_path(int, int, int (*)[2], int*)':
race.cpp:112:56: warning: right operand of comma operator has no effect [-Wunused-value]
  112 |     FOR(i,0,maxn) par[i] = -1, centpar[i] = -1, par[i] -1, depth[i] = -1, realdepth[i] = -1,visited[i] = 0,dists[i].clear(),edges[i].clear(), sus[i] = INF;
      |                                                 ~~~~~~~^~

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 60504 KB Output is correct
2 Correct 7 ms 60508 KB Output is correct
3 Correct 7 ms 60580 KB Output is correct
4 Correct 7 ms 60508 KB Output is correct
5 Correct 7 ms 60572 KB Output is correct
6 Correct 7 ms 60628 KB Output is correct
7 Correct 7 ms 60508 KB Output is correct
8 Correct 7 ms 60508 KB Output is correct
9 Correct 7 ms 60508 KB Output is correct
10 Correct 7 ms 60508 KB Output is correct
11 Correct 7 ms 60664 KB Output is correct
12 Correct 7 ms 60756 KB Output is correct
13 Correct 6 ms 60508 KB Output is correct
14 Correct 7 ms 60504 KB Output is correct
15 Correct 6 ms 60508 KB Output is correct
16 Correct 7 ms 60508 KB Output is correct
17 Correct 7 ms 60608 KB Output is correct
18 Correct 7 ms 60508 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 60504 KB Output is correct
2 Correct 7 ms 60508 KB Output is correct
3 Correct 7 ms 60580 KB Output is correct
4 Correct 7 ms 60508 KB Output is correct
5 Correct 7 ms 60572 KB Output is correct
6 Correct 7 ms 60628 KB Output is correct
7 Correct 7 ms 60508 KB Output is correct
8 Correct 7 ms 60508 KB Output is correct
9 Correct 7 ms 60508 KB Output is correct
10 Correct 7 ms 60508 KB Output is correct
11 Correct 7 ms 60664 KB Output is correct
12 Correct 7 ms 60756 KB Output is correct
13 Correct 6 ms 60508 KB Output is correct
14 Correct 7 ms 60504 KB Output is correct
15 Correct 6 ms 60508 KB Output is correct
16 Correct 7 ms 60508 KB Output is correct
17 Correct 7 ms 60608 KB Output is correct
18 Correct 7 ms 60508 KB Output is correct
19 Correct 7 ms 60508 KB Output is correct
20 Correct 7 ms 60508 KB Output is correct
21 Correct 7 ms 60580 KB Output is correct
22 Correct 7 ms 60620 KB Output is correct
23 Correct 8 ms 60776 KB Output is correct
24 Correct 7 ms 60612 KB Output is correct
25 Correct 7 ms 60764 KB Output is correct
26 Correct 7 ms 60764 KB Output is correct
27 Correct 7 ms 60796 KB Output is correct
28 Correct 8 ms 60760 KB Output is correct
29 Correct 7 ms 60764 KB Output is correct
30 Correct 7 ms 60764 KB Output is correct
31 Correct 7 ms 60764 KB Output is correct
32 Correct 7 ms 60764 KB Output is correct
33 Correct 7 ms 60760 KB Output is correct
34 Correct 8 ms 60764 KB Output is correct
35 Correct 7 ms 60620 KB Output is correct
36 Correct 7 ms 60760 KB Output is correct
37 Correct 7 ms 60764 KB Output is correct
38 Correct 7 ms 60628 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 60504 KB Output is correct
2 Correct 7 ms 60508 KB Output is correct
3 Correct 7 ms 60580 KB Output is correct
4 Correct 7 ms 60508 KB Output is correct
5 Correct 7 ms 60572 KB Output is correct
6 Correct 7 ms 60628 KB Output is correct
7 Correct 7 ms 60508 KB Output is correct
8 Correct 7 ms 60508 KB Output is correct
9 Correct 7 ms 60508 KB Output is correct
10 Correct 7 ms 60508 KB Output is correct
11 Correct 7 ms 60664 KB Output is correct
12 Correct 7 ms 60756 KB Output is correct
13 Correct 6 ms 60508 KB Output is correct
14 Correct 7 ms 60504 KB Output is correct
15 Correct 6 ms 60508 KB Output is correct
16 Correct 7 ms 60508 KB Output is correct
17 Correct 7 ms 60608 KB Output is correct
18 Correct 7 ms 60508 KB Output is correct
19 Correct 118 ms 80180 KB Output is correct
20 Correct 123 ms 80044 KB Output is correct
21 Correct 112 ms 80068 KB Output is correct
22 Correct 99 ms 80276 KB Output is correct
23 Correct 101 ms 80560 KB Output is correct
24 Correct 55 ms 78416 KB Output is correct
25 Correct 123 ms 84092 KB Output is correct
26 Correct 78 ms 85576 KB Output is correct
27 Correct 218 ms 94680 KB Output is correct
28 Correct 270 ms 108356 KB Output is correct
29 Correct 266 ms 107400 KB Output is correct
30 Correct 183 ms 94680 KB Output is correct
31 Correct 195 ms 94684 KB Output is correct
32 Correct 241 ms 94408 KB Output is correct
33 Correct 199 ms 96308 KB Output is correct
34 Correct 206 ms 95536 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 60504 KB Output is correct
2 Correct 7 ms 60508 KB Output is correct
3 Correct 7 ms 60580 KB Output is correct
4 Correct 7 ms 60508 KB Output is correct
5 Correct 7 ms 60572 KB Output is correct
6 Correct 7 ms 60628 KB Output is correct
7 Correct 7 ms 60508 KB Output is correct
8 Correct 7 ms 60508 KB Output is correct
9 Correct 7 ms 60508 KB Output is correct
10 Correct 7 ms 60508 KB Output is correct
11 Correct 7 ms 60664 KB Output is correct
12 Correct 7 ms 60756 KB Output is correct
13 Correct 6 ms 60508 KB Output is correct
14 Correct 7 ms 60504 KB Output is correct
15 Correct 6 ms 60508 KB Output is correct
16 Correct 7 ms 60508 KB Output is correct
17 Correct 7 ms 60608 KB Output is correct
18 Correct 7 ms 60508 KB Output is correct
19 Correct 7 ms 60508 KB Output is correct
20 Correct 7 ms 60508 KB Output is correct
21 Correct 7 ms 60580 KB Output is correct
22 Correct 7 ms 60620 KB Output is correct
23 Correct 8 ms 60776 KB Output is correct
24 Correct 7 ms 60612 KB Output is correct
25 Correct 7 ms 60764 KB Output is correct
26 Correct 7 ms 60764 KB Output is correct
27 Correct 7 ms 60796 KB Output is correct
28 Correct 8 ms 60760 KB Output is correct
29 Correct 7 ms 60764 KB Output is correct
30 Correct 7 ms 60764 KB Output is correct
31 Correct 7 ms 60764 KB Output is correct
32 Correct 7 ms 60764 KB Output is correct
33 Correct 7 ms 60760 KB Output is correct
34 Correct 8 ms 60764 KB Output is correct
35 Correct 7 ms 60620 KB Output is correct
36 Correct 7 ms 60760 KB Output is correct
37 Correct 7 ms 60764 KB Output is correct
38 Correct 7 ms 60628 KB Output is correct
39 Correct 118 ms 80180 KB Output is correct
40 Correct 123 ms 80044 KB Output is correct
41 Correct 112 ms 80068 KB Output is correct
42 Correct 99 ms 80276 KB Output is correct
43 Correct 101 ms 80560 KB Output is correct
44 Correct 55 ms 78416 KB Output is correct
45 Correct 123 ms 84092 KB Output is correct
46 Correct 78 ms 85576 KB Output is correct
47 Correct 218 ms 94680 KB Output is correct
48 Correct 270 ms 108356 KB Output is correct
49 Correct 266 ms 107400 KB Output is correct
50 Correct 183 ms 94680 KB Output is correct
51 Correct 195 ms 94684 KB Output is correct
52 Correct 241 ms 94408 KB Output is correct
53 Correct 199 ms 96308 KB Output is correct
54 Correct 206 ms 95536 KB Output is correct
55 Correct 14 ms 62300 KB Output is correct
56 Correct 13 ms 62376 KB Output is correct
57 Correct 62 ms 80552 KB Output is correct
58 Correct 39 ms 81344 KB Output is correct
59 Correct 78 ms 85452 KB Output is correct
60 Correct 268 ms 107844 KB Output is correct
61 Correct 204 ms 94684 KB Output is correct
62 Correct 190 ms 94404 KB Output is correct
63 Correct 238 ms 94408 KB Output is correct
64 Correct 356 ms 97260 KB Output is correct
65 Correct 304 ms 97560 KB Output is correct
66 Correct 295 ms 105384 KB Output is correct
67 Correct 93 ms 98200 KB Output is correct
68 Correct 216 ms 96020 KB Output is correct
69 Correct 224 ms 96556 KB Output is correct
70 Correct 217 ms 94768 KB Output is correct