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답안 #293295

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
293295 2020-09-07T20:42:22 Z crossing0ver Aesthetic (NOI20_aesthetic) C++17
51 / 100
 604 ms 53880 KB 
#include<bits/stdc++.h>
#define all(x) (x).begin(),(x).end()
#define pii pair<int,int>
#define ll long long
#define pb push_back
#define vi vector<int>
#define se second
#define fi first
using namespace std;
const int N = 3e5+5;
vector<pii> adj[N];
int n,m;
int A[N],B[N],W[N],NUM[N][2],MX[N],par[N],good[N],sub[N],id[N];
ll D[N],FROM_N[N],H[N];
set<pii> path;

ll t[4*N];
void upd(int v,int tl,int tr,int l,int r,ll val) {
    if(l > tr || r < tl) return;
    if (l <= tl && r >= tr)  {
            t[v] = val;
            return;
    }
    t[v*2] = min(t[v*2],t[v]);
    t[v*2+1] = min(t[v*2+1],t[v]);
    int tm = (tl + tr)/2;
    upd(v*2,tl,tm,l,r,val);
    upd(v*2+1,tm+1,tr,l,r,val);
    //t[v] = min(t[v*2],t[v*2+1]);
}
void down(int v,int tl,int tr) {
    if (tl == tr) H[tl] = t[v];
    else {
            int tm = (tl + tr)/2;
            t[v*2] = min(t[v*2],t[v]);
        t[v*2+1] = min(t[v*2+1],t[v]);
        down(v*2,tl,tm);
        down(v*2+1,tm+1,tr);
    }
}
void dijkstra(int s) {
    priority_queue<pair<ll,int>,vector<pair<ll,int> >,greater<pair<ll,int> > > pq;
        pq.push({0,s});
        vector<bool> vis(n+1);
        vector<ll> d(n+1);
        for (int i = 1; i <= n; i++)
            d[i] = 10000000000000000;
        d[s] = 0;
        par[s] = 0;
        id[s] = 0;
        while(!pq.empty()) {
            auto i1 = pq.top();
            pq.pop();
            int v = i1.se;
            if (vis[v]) continue;
            ll dis = i1.fi;
            vis[v] = 1;
            for (auto i : adj[v])
                if (!vis[i.fi] && d[i.fi] > dis + i.se) {
                    d[i.fi] = dis + i.se;
                    id[i.fi] = id[v] + 1;
                    par[i.fi] = v;
                    pq.push({d[i.fi],i.fi});
                }
        }/*1 2 3
2 3 5
1 3 4*/
        if (s == n)
        for (int i = 1; i <= n; i++)
            FROM_N[i] = d[i];
        else {
                for (int i = 1; i <= n; i++)
                    D[i] = d[i];
               int j = n;
                good[1] = 1;
            while(j != 1) {
                good[j] = 1;
                j = par[j];
            }
            for (int i = 2; i <= n; i++) {
                        if (good[i])
                    path.insert({i,par[i]}),
                    path.insert({par[i],i});
                }
            vector<pair<ll,int> > g;
            for (int i =1 ; i <= n; i++) {
                g.pb({d[i],i});
            }
        sort(all(g));
        for (auto i1 : g) {
            int v = i1.se;
            if (!good[v])
                sub[v] = sub [ par[v] ];
            else sub[v] = v;
        }
        }
}
int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    cin >> n >> m;
    for (int i = 0; i < m; i++) {
            int a,b,w;
        cin >> a >> b >> w;
        A[i] = a, B[i] = b;
        W[i] = w;
        NUM[i][0] = adj[a].size();
        NUM[i][1] = adj[b].size();
        adj[a].pb({b,w});
        adj[b].pb({a,w});
        MX[i] = w;
    }
    dijkstra(n);
    dijkstra(1);
    for (int i = 1; i < 4*N; i++)
        t[i] = 100000000000000;
   // cout << FROM_N[1];exit(0);
    for (int i = m-2; i >= 0; i--)
        MX[i] = max(MX[i],MX[i+1]);
    ll ans = D[n];
   // cout << D[n];exit(0);
    /*for (int i = 0; i < m; i++) {
        int a = A[i], b = B[i];
        adj[a][NUM[i][0]].se += MX[i+1];
        adj[b][NUM[i][1]].se += MX[i+1];
        // dijkstra

        priority_queue<pair<ll,int>,vector<pair<ll,int> >,greater<pair<ll,int> > > pq;
        pq.push({0,1});
        vector<bool> vis(n+1);
        vector<ll> d(n+1);
        for (int i = 1; i <= n; i++)
            d[i] = 10000000000000000;
        d[1] = 0;
        while(!pq.empty()) {
            auto i1 = pq.top();
            pq.pop();
            int v = i1.se;
            if (vis[v]) continue;
            ll dis = i1.fi;
            if (v == n) {
                ans = max(ans,dis);
                break;
            }
            vis[v] = 1;
            for (auto i : adj[v])
                if (!vis[i.fi] && d[i.fi] > dis + i.se) {
                    d[i.fi] = dis + i.se;
                    pq.push({d[i.fi],i.fi});
                }

        }
        // replace
        adj[a][NUM[i][0]].se -= MX[i+1];
        adj[b][NUM[i][1]].se -= MX[i+1];
    }*/
    vector<pair<ll,pii> > q;
    for (int i = 0; i < m; i++) {
        int a = A[i], b = B[i];
        if (path.count({a,b}) || sub[a] == sub[b]) continue;
        if (id[sub[a]] > id[sub[b]]) swap(a,b);
        ll dis = D[a] + FROM_N[b] + W[i];
        a = sub[a];
        b = sub[b];
        if (id[a] > id[b]) swap(a,b);
      //  if (id[sub])
      q.pb({dis,{id[a],id[b]-1}});
     //   upd(1,0,id[n],id[a],id[b]-1,dis);
    }
    sort(q.rbegin(),q.rend());
    for (auto i1 : q) {
        int a = i1.se.fi;
        int b = i1.se.se;
        ll val = i1.fi;
        upd(1,0,id[n],a,b,val);
    }
    down(1,0,id[n]);
    for (int i = 0; i < m; i++) {
        int a = A[i], b = B[i];
        if (path.count({a,b}) == 0) continue;
        if (id[a] > id[b]) swap(a,b);
        if (H[id[a]] !=  100000000000000)
        ans = max(ans, min(H[id[a]],D[n] + MX[i+1]));
        else ans = max(ans,D[n] + MX[i+1]);
      /*  ll C = D[n];
        C += MX[i+1];
        //adj[a][NUM[i][0]].se += MX[i+1];
        //adj[b][NUM[i][1]].se += MX[i+1];
        // dijkstra
        for (int i = 0; i < m; i++) {
            int x = A[i], y = B[i];
            if (id[sub[x]] > id[sub[y]]) swap(x,y);

            if (x == a && y == b ) continue;
            if (id[sub[x]] > id[a] || id[sub[y]] < id[b]) continue;
            C = min(C,D[x] + FROM_N[y] + W[i]);
        }
        ans = max(ans,C);

*/
        }
        // replace
        //adj[a][NUM[i][0]].se -= MX[i+1];
        //adj[b][NUM[i][1]].se -= MX[i+1];

    cout << ans;



}

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 11 ms 16896 KB Output is correct
2 Correct 11 ms 16896 KB Output is correct
3 Correct 11 ms 16896 KB Output is correct
4 Correct 11 ms 16896 KB Output is correct
5 Correct 11 ms 16896 KB Output is correct
6 Correct 11 ms 16896 KB Output is correct
7 Correct 11 ms 16896 KB Output is correct
8 Correct 11 ms 16896 KB Output is correct

Subtask #2
8.0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 11 ms 16896 KB Output is correct
2 Correct 11 ms 16896 KB Output is correct
3 Correct 11 ms 16896 KB Output is correct
4 Correct 11 ms 16896 KB Output is correct
5 Correct 11 ms 16896 KB Output is correct
6 Correct 11 ms 16896 KB Output is correct
7 Correct 11 ms 16896 KB Output is correct
8 Correct 11 ms 16896 KB Output is correct
9 Correct 12 ms 17152 KB Output is correct
10 Correct 12 ms 17152 KB Output is correct
11 Correct 12 ms 17024 KB Output is correct
12 Correct 12 ms 17024 KB Output is correct
13 Correct 12 ms 17024 KB Output is correct
14 Correct 12 ms 17024 KB Output is correct
15 Correct 12 ms 17024 KB Output is correct
16 Correct 12 ms 17056 KB Output is correct

Subtask #3
7.0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 586 ms 50576 KB Output is correct
2 Correct 564 ms 50548 KB Output is correct
3 Correct 568 ms 50376 KB Output is correct
4 Correct 585 ms 50496 KB Output is correct
5 Correct 585 ms 50584 KB Output is correct
6 Correct 583 ms 51208 KB Output is correct
7 Correct 586 ms 51116 KB Output is correct
8 Correct 595 ms 51196 KB Output is correct

Subtask #4
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 604 ms 51220 KB Output is correct
2 Correct 594 ms 50804 KB Output is correct
3 Correct 556 ms 50340 KB Output is correct
4 Correct 574 ms 50300 KB Output is correct
5 Correct 587 ms 50576 KB Output is correct
6 Correct 570 ms 50548 KB Output is correct
7 Correct 579 ms 50548 KB Output is correct
8 Correct 599 ms 50896 KB Output is correct

Subtask #5
16.0 / 16.0

# 결과 실행 시간 메모리 Grader output
1 Correct 452 ms 44300 KB Output is correct
2 Correct 252 ms 45196 KB Output is correct
3 Correct 285 ms 37576 KB Output is correct
4 Correct 261 ms 37572 KB Output is correct
5 Correct 280 ms 39112 KB Output is correct
6 Correct 275 ms 37824 KB Output is correct
7 Correct 283 ms 37564 KB Output is correct
8 Correct 272 ms 37688 KB Output is correct
9 Correct 270 ms 37700 KB Output is correct
10 Correct 276 ms 37788 KB Output is correct
11 Correct 276 ms 37700 KB Output is correct
12 Correct 466 ms 44384 KB Output is correct
13 Correct 272 ms 37580 KB Output is correct
14 Correct 275 ms 53808 KB Output is correct
15 Correct 291 ms 53880 KB Output is correct
16 Correct 447 ms 44200 KB Output is correct
17 Correct 452 ms 43584 KB Output is correct
18 Correct 445 ms 43988 KB Output is correct
19 Correct 249 ms 45348 KB Output is correct
20 Correct 247 ms 45308 KB Output is correct
21 Correct 254 ms 45192 KB Output is correct
22 Correct 252 ms 45308 KB Output is correct

Subtask #6
0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 452 ms 44300 KB Output is correct
2 Correct 252 ms 45196 KB Output is correct
3 Correct 285 ms 37576 KB Output is correct
4 Correct 261 ms 37572 KB Output is correct
5 Correct 280 ms 39112 KB Output is correct
6 Correct 275 ms 37824 KB Output is correct
7 Correct 283 ms 37564 KB Output is correct
8 Correct 272 ms 37688 KB Output is correct
9 Correct 270 ms 37700 KB Output is correct
10 Correct 276 ms 37788 KB Output is correct
11 Correct 276 ms 37700 KB Output is correct
12 Correct 466 ms 44384 KB Output is correct
13 Correct 272 ms 37580 KB Output is correct
14 Correct 275 ms 53808 KB Output is correct
15 Correct 291 ms 53880 KB Output is correct
16 Correct 447 ms 44200 KB Output is correct
17 Correct 452 ms 43584 KB Output is correct
18 Correct 445 ms 43988 KB Output is correct
19 Correct 249 ms 45348 KB Output is correct
20 Correct 247 ms 45308 KB Output is correct
21 Correct 254 ms 45192 KB Output is correct
22 Correct 252 ms 45308 KB Output is correct
23 Incorrect 508 ms 46712 KB Output isn't correct
24 Halted 0 ms 0 KB -

Subtask #7
0 / 27.0

# 결과 실행 시간 메모리 Grader output
1 Correct 11 ms 16896 KB Output is correct
2 Correct 11 ms 16896 KB Output is correct
3 Correct 11 ms 16896 KB Output is correct
4 Correct 11 ms 16896 KB Output is correct
5 Correct 11 ms 16896 KB Output is correct
6 Correct 11 ms 16896 KB Output is correct
7 Correct 11 ms 16896 KB Output is correct
8 Correct 11 ms 16896 KB Output is correct
9 Correct 12 ms 17152 KB Output is correct
10 Correct 12 ms 17152 KB Output is correct
11 Correct 12 ms 17024 KB Output is correct
12 Correct 12 ms 17024 KB Output is correct
13 Correct 12 ms 17024 KB Output is correct
14 Correct 12 ms 17024 KB Output is correct
15 Correct 12 ms 17024 KB Output is correct
16 Correct 12 ms 17056 KB Output is correct
17 Correct 586 ms 50576 KB Output is correct
18 Correct 564 ms 50548 KB Output is correct
19 Correct 568 ms 50376 KB Output is correct
20 Correct 585 ms 50496 KB Output is correct
21 Correct 585 ms 50584 KB Output is correct
22 Correct 583 ms 51208 KB Output is correct
23 Correct 586 ms 51116 KB Output is correct
24 Correct 595 ms 51196 KB Output is correct
25 Correct 604 ms 51220 KB Output is correct
26 Correct 594 ms 50804 KB Output is correct
27 Correct 556 ms 50340 KB Output is correct
28 Correct 574 ms 50300 KB Output is correct
29 Correct 587 ms 50576 KB Output is correct
30 Correct 570 ms 50548 KB Output is correct
31 Correct 579 ms 50548 KB Output is correct
32 Correct 599 ms 50896 KB Output is correct
33 Correct 452 ms 44300 KB Output is correct
34 Correct 252 ms 45196 KB Output is correct
35 Correct 285 ms 37576 KB Output is correct
36 Correct 261 ms 37572 KB Output is correct
37 Correct 280 ms 39112 KB Output is correct
38 Correct 275 ms 37824 KB Output is correct
39 Correct 283 ms 37564 KB Output is correct
40 Correct 272 ms 37688 KB Output is correct
41 Correct 270 ms 37700 KB Output is correct
42 Correct 276 ms 37788 KB Output is correct
43 Correct 276 ms 37700 KB Output is correct
44 Correct 466 ms 44384 KB Output is correct
45 Correct 272 ms 37580 KB Output is correct
46 Correct 275 ms 53808 KB Output is correct
47 Correct 291 ms 53880 KB Output is correct
48 Correct 447 ms 44200 KB Output is correct
49 Correct 452 ms 43584 KB Output is correct
50 Correct 445 ms 43988 KB Output is correct
51 Correct 249 ms 45348 KB Output is correct
52 Correct 247 ms 45308 KB Output is correct
53 Correct 254 ms 45192 KB Output is correct
54 Correct 252 ms 45308 KB Output is correct
55 Incorrect 508 ms 46712 KB Output isn't correct
56 Halted 0 ms 0 KB -