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Submission #284939

# Submission time Handle Problem Language Result Execution time Memory
284939 2020-08-28T08:15:39 Z 3zp Aesthetic (NOI20_aesthetic) C++14
51 / 100
 845 ms 77148 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;
/*
00000111111

*/
void ad(ll x){
    if(g[x] == 1)cout<<1/0;
    g[x] = 1;
    for(auto E : v[x]){
        ll y = E.first, l = E.second.first,  u= E.second.second;
        auto it= S.find({dn[y] + l + d1[x], u});
        if(g[y] == 1 && it != S.end()) S.erase(it);
        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];
        if(S.size() == 0) continue;
        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: In function 'void ad(long long int)':
Aesthetic.cpp:14:25: warning: division by zero [-Wdiv-by-zero]
   14 |     if(g[x] == 1)cout<<1/0;
      |                        ~^~
Aesthetic.cpp: At global scope:
Aesthetic.cpp:24:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   24 | main(){
      |      ^
Aesthetic.cpp: In function 'int main()':
Aesthetic.cpp:90:21: 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]
   90 |     for(ll i = 0; i < W.size(); i++){
      |                   ~~^~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 23936 KB Output is correct
2 Correct 19 ms 23936 KB Output is correct
3 Correct 17 ms 23936 KB Output is correct
4 Correct 16 ms 23936 KB Output is correct
5 Correct 16 ms 23936 KB Output is correct
6 Correct 17 ms 23936 KB Output is correct
7 Correct 17 ms 23936 KB Output is correct
8 Correct 20 ms 23936 KB Output is correct

Subtask #2
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 23936 KB Output is correct
2 Correct 19 ms 23936 KB Output is correct
3 Correct 17 ms 23936 KB Output is correct
4 Correct 16 ms 23936 KB Output is correct
5 Correct 16 ms 23936 KB Output is correct
6 Correct 17 ms 23936 KB Output is correct
7 Correct 17 ms 23936 KB Output is correct
8 Correct 20 ms 23936 KB Output is correct
9 Correct 18 ms 24192 KB Output is correct
10 Correct 19 ms 24320 KB Output is correct
11 Correct 18 ms 24192 KB Output is correct
12 Correct 19 ms 24320 KB Output is correct
13 Correct 19 ms 24192 KB Output is correct
14 Correct 18 ms 24192 KB Output is correct
15 Correct 18 ms 24192 KB Output is correct
16 Correct 18 ms 24192 KB Output is correct

Subtask #3
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 761 ms 75088 KB Output is correct
2 Correct 764 ms 74836 KB Output is correct
3 Correct 742 ms 73776 KB Output is correct
4 Correct 771 ms 75228 KB Output is correct
5 Correct 757 ms 73808 KB Output is correct
6 Correct 797 ms 76252 KB Output is correct
7 Correct 795 ms 75984 KB Output is correct
8 Correct 762 ms 75348 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 774 ms 75176 KB Output is correct
2 Correct 768 ms 75624 KB Output is correct
3 Correct 756 ms 74192 KB Output is correct
4 Correct 802 ms 77108 KB Output is correct
5 Correct 751 ms 75924 KB Output is correct
6 Correct 774 ms 77080 KB Output is correct
7 Correct 785 ms 75648 KB Output is correct
8 Correct 769 ms 75024 KB Output is correct

Subtask #5
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 781 ms 70448 KB Output is correct
2 Correct 301 ms 70780 KB Output is correct
3 Correct 399 ms 63244 KB Output is correct
4 Correct 382 ms 62124 KB Output is correct
5 Correct 381 ms 61748 KB Output is correct
6 Correct 383 ms 63076 KB Output is correct
7 Correct 355 ms 61288 KB Output is correct
8 Correct 367 ms 61924 KB Output is correct
9 Correct 364 ms 60944 KB Output is correct
10 Correct 380 ms 63972 KB Output is correct
11 Correct 405 ms 61668 KB Output is correct
12 Correct 825 ms 70564 KB Output is correct
13 Correct 398 ms 61900 KB Output is correct
14 Correct 277 ms 77148 KB Output is correct
15 Correct 199 ms 70128 KB Output is correct
16 Correct 845 ms 71516 KB Output is correct
17 Correct 791 ms 69212 KB Output is correct
18 Correct 751 ms 70748 KB Output is correct
19 Correct 304 ms 70876 KB Output is correct
20 Correct 297 ms 70876 KB Output is correct
21 Correct 296 ms 70876 KB Output is correct
22 Correct 291 ms 70876 KB Output is correct

Subtask #6
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 781 ms 70448 KB Output is correct
2 Correct 301 ms 70780 KB Output is correct
3 Correct 399 ms 63244 KB Output is correct
4 Correct 382 ms 62124 KB Output is correct
5 Correct 381 ms 61748 KB Output is correct
6 Correct 383 ms 63076 KB Output is correct
7 Correct 355 ms 61288 KB Output is correct
8 Correct 367 ms 61924 KB Output is correct
9 Correct 364 ms 60944 KB Output is correct
10 Correct 380 ms 63972 KB Output is correct
11 Correct 405 ms 61668 KB Output is correct
12 Correct 825 ms 70564 KB Output is correct
13 Correct 398 ms 61900 KB Output is correct
14 Correct 277 ms 77148 KB Output is correct
15 Correct 199 ms 70128 KB Output is correct
16 Correct 845 ms 71516 KB Output is correct
17 Correct 791 ms 69212 KB Output is correct
18 Correct 751 ms 70748 KB Output is correct
19 Correct 304 ms 70876 KB Output is correct
20 Correct 297 ms 70876 KB Output is correct
21 Correct 296 ms 70876 KB Output is correct
22 Correct 291 ms 70876 KB Output is correct
23 Incorrect 636 ms 69084 KB Output isn't correct
24 Halted 0 ms 0 KB -

Subtask #7
0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 18 ms 23936 KB Output is correct
2 Correct 19 ms 23936 KB Output is correct
3 Correct 17 ms 23936 KB Output is correct
4 Correct 16 ms 23936 KB Output is correct
5 Correct 16 ms 23936 KB Output is correct
6 Correct 17 ms 23936 KB Output is correct
7 Correct 17 ms 23936 KB Output is correct
8 Correct 20 ms 23936 KB Output is correct
9 Correct 18 ms 24192 KB Output is correct
10 Correct 19 ms 24320 KB Output is correct
11 Correct 18 ms 24192 KB Output is correct
12 Correct 19 ms 24320 KB Output is correct
13 Correct 19 ms 24192 KB Output is correct
14 Correct 18 ms 24192 KB Output is correct
15 Correct 18 ms 24192 KB Output is correct
16 Correct 18 ms 24192 KB Output is correct
17 Correct 761 ms 75088 KB Output is correct
18 Correct 764 ms 74836 KB Output is correct
19 Correct 742 ms 73776 KB Output is correct
20 Correct 771 ms 75228 KB Output is correct
21 Correct 757 ms 73808 KB Output is correct
22 Correct 797 ms 76252 KB Output is correct
23 Correct 795 ms 75984 KB Output is correct
24 Correct 762 ms 75348 KB Output is correct
25 Correct 774 ms 75176 KB Output is correct
26 Correct 768 ms 75624 KB Output is correct
27 Correct 756 ms 74192 KB Output is correct
28 Correct 802 ms 77108 KB Output is correct
29 Correct 751 ms 75924 KB Output is correct
30 Correct 774 ms 77080 KB Output is correct
31 Correct 785 ms 75648 KB Output is correct
32 Correct 769 ms 75024 KB Output is correct
33 Correct 781 ms 70448 KB Output is correct
34 Correct 301 ms 70780 KB Output is correct
35 Correct 399 ms 63244 KB Output is correct
36 Correct 382 ms 62124 KB Output is correct
37 Correct 381 ms 61748 KB Output is correct
38 Correct 383 ms 63076 KB Output is correct
39 Correct 355 ms 61288 KB Output is correct
40 Correct 367 ms 61924 KB Output is correct
41 Correct 364 ms 60944 KB Output is correct
42 Correct 380 ms 63972 KB Output is correct
43 Correct 405 ms 61668 KB Output is correct
44 Correct 825 ms 70564 KB Output is correct
45 Correct 398 ms 61900 KB Output is correct
46 Correct 277 ms 77148 KB Output is correct
47 Correct 199 ms 70128 KB Output is correct
48 Correct 845 ms 71516 KB Output is correct
49 Correct 791 ms 69212 KB Output is correct
50 Correct 751 ms 70748 KB Output is correct
51 Correct 304 ms 70876 KB Output is correct
52 Correct 297 ms 70876 KB Output is correct
53 Correct 296 ms 70876 KB Output is correct
54 Correct 291 ms 70876 KB Output is correct
55 Incorrect 636 ms 69084 KB Output isn't correct
56 Halted 0 ms 0 KB -