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Submission #284930

# Submission time Handle Problem Language Result Execution time Memory
284930 2020-08-28T08:08:26 Z 3zp Aesthetic (NOI20_aesthetic) C++14
35 / 100
 853 ms 142608 KB 
#include<bits/stdc++.h>
#define ll long long
using namespace std;
const int N = 500009;
vector<pair<ll, pair<ll, ll > > > v[N];
vector<ll> T[N];
ll d1[N],dn[N], f[N], g[N],ea[N],eb[N],ec[N], par[N],path[N],wh[N];
multiset<pair<ll,ll> > S;
void ad(ll x){
    g[x] = 1;
    for(auto E : v[x]){
        ll y = E.first, l = E.second.first,  u= E.second.second;
        if(g[y] == 1) S.erase(S.find({dn[y] + l + d1[x], u}));
        else S.insert({dn[x] + l + d1[y], u});
    }
}
ll A = 0;
main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    ll n, m;
    cin >> n >> m;
    for(ll i = 0; i < m; i++){
        cin>>ea[i]>>eb[i]>>ec[i];
    }
    for(ll i = m-1; i >= 0; i--){
        ll a = ea[i], b = eb[i], c = ec[i];

        v[a].push_back({b, {c,A}});
        v[b].push_back({a, {c,A}});
        A = max(A, c);
    }
    for(ll i = 1; i <= n; i++){
        d1[i] = 1e18;
        dn[i] = 1e18;
    }
    d1[1] = 0;
    dn[n] = 0;
    priority_queue<pair<ll, ll> > q;
    q.push({0, 1});
    while(q.size()){
        ll x = q.top().second;
        q.pop();
        if(f[x]) continue;
        f[x] = 1;
        for(auto E: v[x]){
            ll y = E.first, l = E.second.first;
            if(!f[y] && d1[y] > d1[x] + l){
                d1[y] = d1[x] + l;
                par[y] = x;
                q.push({-d1[y], y});
            }
        }
    }
    q.push({0, n});
    for(ll i = 1; i <= n; i++)
        f[i] = 0;
    while(q.size()){
        ll x = q.top().second;
        q.pop();
        if(f[x]) continue;
        f[x] = 1;
        for(auto E: v[x]){
            ll y = E.first, l = E.second.first;
            if(!f[y] && dn[y] > dn[x] + l){
                dn[y] = dn[x] + l;
                q.push({-dn[y], y});
            }
        }
    }
    vector<pair<ll,ll> > W;
    ll ans = d1[n];
    ll X = n;
    while(1){
        path[X] = 1;
        if(X == 1) break;
        X = par[X];
    }

    for(ll i = 1; i <= n; i++){
        W.push_back({d1[i], i});
    }
    sort(W.begin(), W.end());
    for(ll i = 0; i < W.size(); i++){
        ll x = W[i].second;
        if(path[x]) wh[x] = x;
        else wh[x] = wh[par[x]];
        T[wh[x]].push_back(x);
    }
    ll x = n;
    while(1){
        for(ll y : T[x])
            ad(y);
        if(x == 1) break;
        x = par[x];
        ll U = S.begin()->first + S.begin()->second;
        auto it = S.begin();
        it++;
        if(it != S.end()) U = min(U, it->first);
        ans = max(ans, U);
    }
    cout<<ans<<endl;
}

Compilation message

Aesthetic.cpp:18:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   18 | main(){
      |      ^
Aesthetic.cpp: In function 'int main()':
Aesthetic.cpp:84:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int>, std::allocator<std::pair<long long int, long long int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   84 |     for(ll i = 0; i < W.size(); i++){
      |                   ~~^~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 23936 KB Output is correct
2 Correct 16 ms 23936 KB Output is correct
3 Correct 16 ms 23936 KB Output is correct
4 Correct 17 ms 23936 KB Output is correct
5 Correct 16 ms 23936 KB Output is correct
6 Correct 16 ms 23936 KB Output is correct
7 Correct 16 ms 23936 KB Output is correct
8 Correct 16 ms 23936 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 23936 KB Output is correct
2 Correct 16 ms 23936 KB Output is correct
3 Correct 16 ms 23936 KB Output is correct
4 Correct 17 ms 23936 KB Output is correct
5 Correct 16 ms 23936 KB Output is correct
6 Correct 16 ms 23936 KB Output is correct
7 Correct 16 ms 23936 KB Output is correct
8 Correct 16 ms 23936 KB Output is correct
9 Correct 19 ms 24192 KB Output is correct
10 Correct 19 ms 24192 KB Output is correct
11 Correct 22 ms 24192 KB Output is correct
12 Correct 19 ms 24192 KB Output is correct
13 Correct 18 ms 24192 KB Output is correct
14 Correct 18 ms 24192 KB Output is correct
15 Correct 19 ms 24224 KB Output is correct
16 Correct 21 ms 24192 KB Output is correct

Subtask #3
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 752 ms 74900 KB Output is correct
2 Correct 764 ms 74976 KB Output is correct
3 Correct 757 ms 73648 KB Output is correct
4 Correct 773 ms 75052 KB Output is correct
5 Correct 752 ms 73808 KB Output is correct
6 Correct 773 ms 76252 KB Output is correct
7 Correct 769 ms 75984 KB Output is correct
8 Correct 767 ms 75216 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 768 ms 75084 KB Output is correct
2 Correct 757 ms 75528 KB Output is correct
3 Correct 773 ms 74192 KB Output is correct
4 Correct 778 ms 77008 KB Output is correct
5 Correct 764 ms 75836 KB Output is correct
6 Correct 782 ms 77136 KB Output is correct
7 Correct 805 ms 75600 KB Output is correct
8 Correct 791 ms 74976 KB Output is correct

Subtask #5
0 / 16.0

# Verdict Execution time Memory Grader output
1 Runtime error 853 ms 142608 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #6
0 / 22.0

# Verdict Execution time Memory Grader output
1 Runtime error 853 ms 142608 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #7
0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 23936 KB Output is correct
2 Correct 16 ms 23936 KB Output is correct
3 Correct 16 ms 23936 KB Output is correct
4 Correct 17 ms 23936 KB Output is correct
5 Correct 16 ms 23936 KB Output is correct
6 Correct 16 ms 23936 KB Output is correct
7 Correct 16 ms 23936 KB Output is correct
8 Correct 16 ms 23936 KB Output is correct
9 Correct 19 ms 24192 KB Output is correct
10 Correct 19 ms 24192 KB Output is correct
11 Correct 22 ms 24192 KB Output is correct
12 Correct 19 ms 24192 KB Output is correct
13 Correct 18 ms 24192 KB Output is correct
14 Correct 18 ms 24192 KB Output is correct
15 Correct 19 ms 24224 KB Output is correct
16 Correct 21 ms 24192 KB Output is correct
17 Correct 752 ms 74900 KB Output is correct
18 Correct 764 ms 74976 KB Output is correct
19 Correct 757 ms 73648 KB Output is correct
20 Correct 773 ms 75052 KB Output is correct
21 Correct 752 ms 73808 KB Output is correct
22 Correct 773 ms 76252 KB Output is correct
23 Correct 769 ms 75984 KB Output is correct
24 Correct 767 ms 75216 KB Output is correct
25 Correct 768 ms 75084 KB Output is correct
26 Correct 757 ms 75528 KB Output is correct
27 Correct 773 ms 74192 KB Output is correct
28 Correct 778 ms 77008 KB Output is correct
29 Correct 764 ms 75836 KB Output is correct
30 Correct 782 ms 77136 KB Output is correct
31 Correct 805 ms 75600 KB Output is correct
32 Correct 791 ms 74976 KB Output is correct
33 Runtime error 853 ms 142608 KB Execution killed with signal 11
34 Halted 0 ms 0 KB -