oj.uz

Submission #881226

# Submission time Handle Problem Language Result Execution time Memory
881226 2023-11-30T22:02:11 Z nikd Dreaming (IOI13_dreaming) C++17
0 / 100
 28 ms 12880 KB 
#include <bits/stdc++.h>
#include "dreaming.h"
#define MAXN 100001
using namespace std;

int maxpar1[MAXN];
int node1[MAXN];
int maxpar2[MAXN];
int maxlength[MAXN];
int maxbyp[MAXN];
bool vis[MAXN];
int tree[MAXN];
int cont;
vector<int> mintree;
vector<pair<int, int>> adj[MAXN];
void dfs1(int v, int p){   
    tree[v]=cont;
    vis[v]=true;
    if(adj[v].size()==1&&p!=v){
        maxpar1[v]=0;
        maxpar2[v]=0;
    }
    else{
        for (auto u : adj[v]) {
            if (u.first != p){
                dfs1(u.first, v);
                if(maxpar1[v]<maxpar1[u.first]+u.second){
                    maxpar2[v]=maxpar1[v];
                    maxpar1[v]=maxpar1[u.first]+u.second;
                    node1[v]=u.first;
                }
                else if(maxpar2[v]<maxpar1[u.first]+u.second){
                    maxpar2[v]=maxpar1[u.first]+u.second;
                }
                
            }
        }
    }
    maxlength[v]=maxpar1[v];
}
void dfs2(int v, int p, int d){   
    vis[v]=true;
    if(v!=p){
        if(node1[p]!=v){
            maxbyp[v]= max(maxpar1[p]+d, maxbyp[p]+d);
            maxlength[v]=max(maxlength[v], maxbyp[v]);
        }
        else{
            
            maxbyp[v]=max(maxpar2[p]+d, maxbyp[p]+d);
            maxlength[v]=max(maxlength[v], maxbyp[v]);
        }
    }
    for (auto u : adj[v]) {
        if (u.first != p){
            dfs2(u.first, v, u.second);
            
        }
    }
    
}


int travelTime(int N, int M, int L, int A[], int B[], int T[]){
    for(int i = 0; i<M; i++){
        adj[A[i]].push_back({B[i], T[i]});
        adj[B[i]].push_back({A[i], T[i]});
    }
    for(int i = 0; i<N; i++){
        maxpar1[i]=-1;
        maxpar2[i]=0;
        maxlength[i]=-1;
        maxbyp[i]=0;
        vis[i]=false;
    }
    cont =0;
    for(int i =0; i<N; i++){
        if(!vis[i]){
            mintree.push_back(INT_MAX);
            dfs1(i,i);
            cont++;
        }
    }
    for(int i =0; i<N; i++) vis[i]=false;
    for(int i =0; i<N; i++){
        if(!vis[i]){
            dfs2(i, i, 0);
        }
    }
    int maxbest1=-1;
    int maxbest2=-1;
    int maxbest3=-1;
    for(int i =0; i<N; i++){
        if(maxlength[i]<mintree[tree[i]]){
            mintree[tree[i]]=maxlength[i];
            
        }
    }
    for(int j: mintree){
        if(j>maxbest1){
            maxbest3=maxbest2;
            maxbest2=maxbest1;
            maxbest1=j;
            
        }
        else if(j>maxbest2){
            maxbest3=maxbest2;
            maxbest2=j;
        }
        else if(j>maxbest3){
            maxbest3=j;
        }
    }
    int sol;
    if(maxbest3!=-1){
        sol =max(maxbest1+L+maxbest2, maxbest2+maxbest3+2*L);
    }
    else sol=maxbest1+L+maxbest2;
    return sol;


}

/*int main(){
    int N, M, L;
    cin >> N >> M >> L;
    int A[M], B[M], T[M];
    for(int i  =0; i<M; i++){
        cin >> A[i] >> B[i] >> T[i];
    }
    cout << travelTime(N, M, L, A, B, T) << endl;
}*/

Subtask #1
0 / 14.0

# Verdict Execution time Memory Grader output
1 Incorrect 28 ms 12880 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 4444 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 28 ms 12880 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 8412 KB Output is correct
2 Correct 14 ms 8920 KB Output is correct
3 Correct 13 ms 8924 KB Output is correct
4 Correct 13 ms 8924 KB Output is correct
5 Correct 13 ms 8924 KB Output is correct
6 Correct 14 ms 9440 KB Output is correct
7 Correct 14 ms 9180 KB Output is correct
8 Correct 15 ms 8780 KB Output is correct
9 Correct 12 ms 8888 KB Output is correct
10 Correct 14 ms 8916 KB Output is correct
11 Correct 1 ms 4444 KB Output is correct
12 Correct 3 ms 6616 KB Output is correct
13 Correct 5 ms 6732 KB Output is correct
14 Correct 3 ms 6616 KB Output is correct
15 Correct 3 ms 6616 KB Output is correct
16 Correct 3 ms 6616 KB Output is correct
17 Correct 3 ms 6468 KB Output is correct
18 Correct 3 ms 6616 KB Output is correct
19 Correct 3 ms 6724 KB Output is correct
20 Incorrect 1 ms 4444 KB Output isn't correct
21 Halted 0 ms 0 KB -

Subtask #5
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 4444 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 28 ms 12880 KB Output isn't correct
2 Halted 0 ms 0 KB -