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답안 #478734

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
478734 2021-10-08T08:13:54 Z byungkyu 경주 (Race) (IOI11_race) C++14
100 / 100
 1035 ms 43348 KB 
#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define pii pair<int,int>
#define fi first
#define se second
using namespace std;
 
vector<pii> ch[200005],vec;
vector<int> st;
set<int> se;
int sz[200005],cent[200005],dp[1000005],ret=1e6,l;

int getsz(int n,int pa){
    sz[n]=1;
    for(auto a : ch[n]){
        if(a.fi==pa||cent[a.fi])continue;
        sz[n]+=getsz(a.fi,n);
    }
    return sz[n];
}

int getcent(int now,int pa,int cap){
    int b,m=cap-sz[now];
    for(auto a : ch[now]){
        if(a.fi==pa||cent[a.fi])continue;
        m=max(m,sz[a.fi]);
        b=getcent(a.fi,now,cap);
        if(b)return b;
    }
    if(m*2<=cap)return now;
    return 0;
}

int adjmax(int now,int pa){
    int k=0;
    for(auto a : ch[now]){
        if(a.fi==pa)continue;
        if(cent[a.fi])k=max(k,cent[a.fi]);
        else k=max(k,adjmax(a.fi,now));
    }
    return k;
}

void dfs(int now,int pa,int th,int w,int dis){
    if(w>l)return;
    st.push_back(w);
    if(l>=w&&dp[l-w]!=-1)ret=min(ret,dp[l-w]+dis);
    for(auto a : ch[now]){
        if(a.fi==pa)continue;
        if(cent[a.fi]<=th)continue;
        dfs(a.fi,now,th,w+a.se,dis+1);
    }
    vec.push_back({w,dis});
}

int best_path(int N,int K,int H[][2],int L[]){     
    int i,j,k,a,b,c,n;
    //scanf("%lld%lld",&n,&l);
    n=N;l=K;
    for(i=0;i<n-1;i++){
        //scanf("%lld%lld%lld",&a,&b,&c);
        //a++;b++;
        a=H[i][0];b=H[i][1];c=L[i];
        a++;b++;
        ch[a].push_back({b,c});
        ch[b].push_back({a,c});
    }
    for(i=1;i<=n;i++){
        se.insert(i);
    }
    while(!se.empty()){
        a=*se.begin();
        k=getsz(a,0);
        b=getcent(a,0,k);
        cent[b]=adjmax(a,0)+1;
        //printf("%lld %lld\n",b,cent[b]);
        se.erase(se.find(b));
    }
    for(i=1;i<=l;i++)dp[i]=-1;
    for(i=1;i<=n;i++){
        for(auto t : ch[i]){
            if(cent[t.fi]<=cent[i])continue;
            dfs(t.fi,i,cent[i],t.se,1);
            while(vec.size()){
                if(dp[vec.back().fi]==-1)dp[vec.back().fi]=vec.back().se;
                else dp[vec.back().fi]=min(dp[vec.back().fi],vec.back().se);
                vec.pop_back();
            }
        }
        while(st.size()){
            dp[st.back()]=-1;
            st.pop_back();
        }
    }
    if(ret==1e6)return -1;
    return ret;
}

Compilation message

race.cpp: In function 'int best_path(int, int, int (*)[2], int*)':
race.cpp:58:11: warning: unused variable 'j' [-Wunused-variable]
   58 |     int i,j,k,a,b,c,n;
      |           ^

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 3 ms 4940 KB Output is correct
3 Correct 3 ms 4940 KB Output is correct
4 Correct 3 ms 4940 KB Output is correct
5 Correct 5 ms 4940 KB Output is correct
6 Correct 3 ms 4940 KB Output is correct
7 Correct 4 ms 4940 KB Output is correct
8 Correct 3 ms 4940 KB Output is correct
9 Correct 3 ms 4940 KB Output is correct
10 Correct 3 ms 4940 KB Output is correct
11 Correct 3 ms 4940 KB Output is correct
12 Correct 3 ms 4940 KB Output is correct
13 Correct 3 ms 4940 KB Output is correct
14 Correct 3 ms 4940 KB Output is correct
15 Correct 4 ms 4940 KB Output is correct
16 Correct 4 ms 4940 KB Output is correct
17 Correct 3 ms 4940 KB Output is correct
18 Correct 3 ms 4940 KB Output is correct

Subtask #2
12.0 / 12.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 3 ms 4940 KB Output is correct
3 Correct 3 ms 4940 KB Output is correct
4 Correct 3 ms 4940 KB Output is correct
5 Correct 5 ms 4940 KB Output is correct
6 Correct 3 ms 4940 KB Output is correct
7 Correct 4 ms 4940 KB Output is correct
8 Correct 3 ms 4940 KB Output is correct
9 Correct 3 ms 4940 KB Output is correct
10 Correct 3 ms 4940 KB Output is correct
11 Correct 3 ms 4940 KB Output is correct
12 Correct 3 ms 4940 KB Output is correct
13 Correct 3 ms 4940 KB Output is correct
14 Correct 3 ms 4940 KB Output is correct
15 Correct 4 ms 4940 KB Output is correct
16 Correct 4 ms 4940 KB Output is correct
17 Correct 3 ms 4940 KB Output is correct
18 Correct 3 ms 4940 KB Output is correct
19 Correct 3 ms 4940 KB Output is correct
20 Correct 3 ms 4940 KB Output is correct
21 Correct 4 ms 5068 KB Output is correct
22 Correct 5 ms 8652 KB Output is correct
23 Correct 5 ms 8012 KB Output is correct
24 Correct 6 ms 8396 KB Output is correct
25 Correct 6 ms 8524 KB Output is correct
26 Correct 5 ms 6348 KB Output is correct
27 Correct 5 ms 8140 KB Output is correct
28 Correct 4 ms 5836 KB Output is correct
29 Correct 5 ms 6348 KB Output is correct
30 Correct 5 ms 6476 KB Output is correct
31 Correct 5 ms 7628 KB Output is correct
32 Correct 6 ms 7884 KB Output is correct
33 Correct 6 ms 8140 KB Output is correct
34 Correct 5 ms 7348 KB Output is correct
35 Correct 6 ms 8184 KB Output is correct
36 Correct 6 ms 8652 KB Output is correct
37 Correct 6 ms 8140 KB Output is correct
38 Correct 5 ms 6988 KB Output is correct

Subtask #3
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 3 ms 4940 KB Output is correct
3 Correct 3 ms 4940 KB Output is correct
4 Correct 3 ms 4940 KB Output is correct
5 Correct 5 ms 4940 KB Output is correct
6 Correct 3 ms 4940 KB Output is correct
7 Correct 4 ms 4940 KB Output is correct
8 Correct 3 ms 4940 KB Output is correct
9 Correct 3 ms 4940 KB Output is correct
10 Correct 3 ms 4940 KB Output is correct
11 Correct 3 ms 4940 KB Output is correct
12 Correct 3 ms 4940 KB Output is correct
13 Correct 3 ms 4940 KB Output is correct
14 Correct 3 ms 4940 KB Output is correct
15 Correct 4 ms 4940 KB Output is correct
16 Correct 4 ms 4940 KB Output is correct
17 Correct 3 ms 4940 KB Output is correct
18 Correct 3 ms 4940 KB Output is correct
19 Correct 278 ms 15428 KB Output is correct
20 Correct 320 ms 15324 KB Output is correct
21 Correct 295 ms 15252 KB Output is correct
22 Correct 308 ms 15392 KB Output is correct
23 Correct 196 ms 15576 KB Output is correct
24 Correct 141 ms 15428 KB Output is correct
25 Correct 302 ms 18156 KB Output is correct
26 Correct 165 ms 21060 KB Output is correct
27 Correct 298 ms 25784 KB Output is correct
28 Correct 745 ms 37040 KB Output is correct
29 Correct 705 ms 36116 KB Output is correct
30 Correct 312 ms 25784 KB Output is correct
31 Correct 317 ms 25904 KB Output is correct
32 Correct 531 ms 25772 KB Output is correct
33 Correct 680 ms 24644 KB Output is correct
34 Correct 547 ms 24640 KB Output is correct

Subtask #4
57.0 / 57.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 3 ms 4940 KB Output is correct
3 Correct 3 ms 4940 KB Output is correct
4 Correct 3 ms 4940 KB Output is correct
5 Correct 5 ms 4940 KB Output is correct
6 Correct 3 ms 4940 KB Output is correct
7 Correct 4 ms 4940 KB Output is correct
8 Correct 3 ms 4940 KB Output is correct
9 Correct 3 ms 4940 KB Output is correct
10 Correct 3 ms 4940 KB Output is correct
11 Correct 3 ms 4940 KB Output is correct
12 Correct 3 ms 4940 KB Output is correct
13 Correct 3 ms 4940 KB Output is correct
14 Correct 3 ms 4940 KB Output is correct
15 Correct 4 ms 4940 KB Output is correct
16 Correct 4 ms 4940 KB Output is correct
17 Correct 3 ms 4940 KB Output is correct
18 Correct 3 ms 4940 KB Output is correct
19 Correct 3 ms 4940 KB Output is correct
20 Correct 3 ms 4940 KB Output is correct
21 Correct 4 ms 5068 KB Output is correct
22 Correct 5 ms 8652 KB Output is correct
23 Correct 5 ms 8012 KB Output is correct
24 Correct 6 ms 8396 KB Output is correct
25 Correct 6 ms 8524 KB Output is correct
26 Correct 5 ms 6348 KB Output is correct
27 Correct 5 ms 8140 KB Output is correct
28 Correct 4 ms 5836 KB Output is correct
29 Correct 5 ms 6348 KB Output is correct
30 Correct 5 ms 6476 KB Output is correct
31 Correct 5 ms 7628 KB Output is correct
32 Correct 6 ms 7884 KB Output is correct
33 Correct 6 ms 8140 KB Output is correct
34 Correct 5 ms 7348 KB Output is correct
35 Correct 6 ms 8184 KB Output is correct
36 Correct 6 ms 8652 KB Output is correct
37 Correct 6 ms 8140 KB Output is correct
38 Correct 5 ms 6988 KB Output is correct
39 Correct 278 ms 15428 KB Output is correct
40 Correct 320 ms 15324 KB Output is correct
41 Correct 295 ms 15252 KB Output is correct
42 Correct 308 ms 15392 KB Output is correct
43 Correct 196 ms 15576 KB Output is correct
44 Correct 141 ms 15428 KB Output is correct
45 Correct 302 ms 18156 KB Output is correct
46 Correct 165 ms 21060 KB Output is correct
47 Correct 298 ms 25784 KB Output is correct
48 Correct 745 ms 37040 KB Output is correct
49 Correct 705 ms 36116 KB Output is correct
50 Correct 312 ms 25784 KB Output is correct
51 Correct 317 ms 25904 KB Output is correct
52 Correct 531 ms 25772 KB Output is correct
53 Correct 680 ms 24644 KB Output is correct
54 Correct 547 ms 24640 KB Output is correct
55 Correct 15 ms 5964 KB Output is correct
56 Correct 18 ms 5988 KB Output is correct
57 Correct 138 ms 16800 KB Output is correct
58 Correct 68 ms 16536 KB Output is correct
59 Correct 169 ms 23056 KB Output is correct
60 Correct 944 ms 43348 KB Output is correct
61 Correct 314 ms 28872 KB Output is correct
62 Correct 327 ms 32616 KB Output is correct
63 Correct 665 ms 32620 KB Output is correct
64 Correct 1035 ms 31112 KB Output is correct
65 Correct 572 ms 29664 KB Output is correct
66 Correct 900 ms 41176 KB Output is correct
67 Correct 218 ms 33344 KB Output is correct
68 Correct 555 ms 33416 KB Output is correct
69 Correct 571 ms 33644 KB Output is correct
70 Correct 545 ms 32376 KB Output is correct