oj.uz

답안 #459537

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
459537 2021-08-08T15:20:11 Z nickmet2004 Aesthetic (NOI20_aesthetic) C++11
35 / 100
 832 ms 133192 KB 
#include<bits/stdc++.h>
#define ll long long
using namespace std;
const int N = 3e5 + 1;
ll n , m , au[N] , av[N] , aw[N];
ll u , v , w , A = 0;
vector<pair<ll, pair<ll , ll> > >  adj[N];
ll d1[N] , dn[N] , f[N] , par[N] , path[N] , son[N];
priority_queue<pair<ll , ll> > pq;
multiset<pair<ll , ll>> S;
vector<ll> B[N] , T[N];
void q(int x){
    f[x] = 1;
    for(auto y : adj[x]){
        //cout << "h";
        auto it = S.find({dn[y.first] + y.second.first + d1[x] , y.second.second});
        if(f[y.first]) S.erase(it);
        else S.insert({dn[x] + y.second.first + d1[y.first] , y.second.second});
    }
}
void dfs(int u , int p){
    if(path[u]) son[u] = u;
    else son[u] = son[p];
    T[son[u]].emplace_back(u);
    for(int v : B[u]) dfs(v , u);
}
main (){
    ios_base::sync_with_stdio(0); cin.tie(0);
    cin >> n >> m;
    for(int i  =0; i <m; ++i) cin >> au[i] >> av[i] >> aw[i];
    for(int i = m - 1; ~i; --i){
        u = au[i] , v = av[i] , w= aw[i];
        adj[u].push_back({v , {w , A}});
        adj[v].push_back({u , {w , A}});
        A = max(A , w);
        //cout << "j";
    }

    for(int i = 1; i <= n; ++i) d1[i] = dn[i] = 1e18;
    d1[1] = 0;
    dn[n] = 0;
    pq.push({0 , 1});
    while(pq.size()){
        auto T = pq.top(); pq.pop();
        u = T.second , w = -T.first;
        if(f[u])continue;
        f[u] = 1;
        for(auto e : adj[u]){
            v = e.first;
            if(d1[v] > w + e.second.first){
                par[v] = u;
                d1[v] = w + e.second.first;
                pq.push({-d1[v] , v});
            }
        }
        //cout << "k";
    }

    memset(f , 0 ,sizeof(f));
    pq.push({0, n});
    while(pq.size()){
        auto T = pq.top(); pq.pop();
        u = T.second , w = -T.first;
        if(f[u])continue;
        f[u] = 1;
        for(auto e : adj[u]){
            v = e.first;
            if(dn[v] > w + e.second.first){
                dn[v]= w + e.second.first;
                pq.push({-dn[v] , v});
            }
        }
        //cout << "l";
    }

    ll X = n;
    while(1){
        path[X] = 1;
        if(X == 1) break;
        X = par[X];
        //cout << "n";
    }

    for(int i = 1; i <= n; ++i)B[par[i]].emplace_back(i);
    dfs(1 , 0);

    memset(f , 0 ,sizeof(f));
    u = n;
    ll ans = d1[n];
    //cout << "ka";

    while(1){
        //cout << "ha";
        for(ll v : T[u]) q(v);
        if(u == 1)break;
        if(!S.size())continue;
        ll k = S.begin()->first + S.begin()->second;
        auto i = S.begin();
        ++i;
        if(i != S.end()) k =min(k , i->first);
        ans = max(ans , k);
        u = par[u];
    }
    cout << ans;

}

Compilation message

Aesthetic.cpp:27:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   27 | main (){
      | ^~~~

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 13 ms 23756 KB Output is correct
2 Correct 13 ms 23852 KB Output is correct
3 Correct 14 ms 23756 KB Output is correct
4 Correct 14 ms 23764 KB Output is correct
5 Correct 13 ms 23876 KB Output is correct
6 Correct 13 ms 23756 KB Output is correct
7 Correct 13 ms 23848 KB Output is correct
8 Correct 13 ms 23844 KB Output is correct

Subtask #2
8.0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 13 ms 23756 KB Output is correct
2 Correct 13 ms 23852 KB Output is correct
3 Correct 14 ms 23756 KB Output is correct
4 Correct 14 ms 23764 KB Output is correct
5 Correct 13 ms 23876 KB Output is correct
6 Correct 13 ms 23756 KB Output is correct
7 Correct 13 ms 23848 KB Output is correct
8 Correct 13 ms 23844 KB Output is correct
9 Correct 16 ms 24140 KB Output is correct
10 Correct 16 ms 24068 KB Output is correct
11 Correct 15 ms 24152 KB Output is correct
12 Correct 15 ms 24040 KB Output is correct
13 Correct 16 ms 24052 KB Output is correct
14 Correct 15 ms 24068 KB Output is correct
15 Correct 15 ms 24132 KB Output is correct
16 Correct 15 ms 24044 KB Output is correct

Subtask #3
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 703 ms 70200 KB Output is correct
2 Correct 745 ms 69516 KB Output is correct
3 Correct 714 ms 69792 KB Output is correct
4 Correct 694 ms 69972 KB Output is correct
5 Correct 726 ms 70276 KB Output is correct
6 Correct 721 ms 71388 KB Output is correct
7 Correct 737 ms 70804 KB Output is correct
8 Correct 770 ms 71424 KB Output is correct

Subtask #4
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 769 ms 71756 KB Output is correct
2 Correct 763 ms 70588 KB Output is correct
3 Correct 742 ms 68924 KB Output is correct
4 Correct 758 ms 70900 KB Output is correct
5 Correct 733 ms 70712 KB Output is correct
6 Correct 751 ms 71572 KB Output is correct
7 Correct 720 ms 70668 KB Output is correct
8 Correct 832 ms 70892 KB Output is correct

Subtask #5
0 / 16.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 792 ms 133192 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -

Subtask #6
0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 792 ms 133192 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -

Subtask #7
0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Correct 13 ms 23756 KB Output is correct
2 Correct 13 ms 23852 KB Output is correct
3 Correct 14 ms 23756 KB Output is correct
4 Correct 14 ms 23764 KB Output is correct
5 Correct 13 ms 23876 KB Output is correct
6 Correct 13 ms 23756 KB Output is correct
7 Correct 13 ms 23848 KB Output is correct
8 Correct 13 ms 23844 KB Output is correct
9 Correct 16 ms 24140 KB Output is correct
10 Correct 16 ms 24068 KB Output is correct
11 Correct 15 ms 24152 KB Output is correct
12 Correct 15 ms 24040 KB Output is correct
13 Correct 16 ms 24052 KB Output is correct
14 Correct 15 ms 24068 KB Output is correct
15 Correct 15 ms 24132 KB Output is correct
16 Correct 15 ms 24044 KB Output is correct
17 Correct 703 ms 70200 KB Output is correct
18 Correct 745 ms 69516 KB Output is correct
19 Correct 714 ms 69792 KB Output is correct
20 Correct 694 ms 69972 KB Output is correct
21 Correct 726 ms 70276 KB Output is correct
22 Correct 721 ms 71388 KB Output is correct
23 Correct 737 ms 70804 KB Output is correct
24 Correct 770 ms 71424 KB Output is correct
25 Correct 769 ms 71756 KB Output is correct
26 Correct 763 ms 70588 KB Output is correct
27 Correct 742 ms 68924 KB Output is correct
28 Correct 758 ms 70900 KB Output is correct
29 Correct 733 ms 70712 KB Output is correct
30 Correct 751 ms 71572 KB Output is correct
31 Correct 720 ms 70668 KB Output is correct
32 Correct 832 ms 70892 KB Output is correct
33 Runtime error 792 ms 133192 KB Execution killed with signal 6
34 Halted 0 ms 0 KB -