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Submission #76653

# Submission time Handle Problem Language Result Execution time Memory
76653 2018-09-15T11:21:34 Z Shafin666 Dreaming (IOI13_dreaming) C++14
18 / 100
 62 ms 12280 KB 
#include <bits/stdc++.h>
#include "dreaming.h"

#define edge pair<int, int>
#define to first
#define cost second
using namespace std;

const int MAX_N = 123456;
vector<edge> adj[MAX_N]; vector<int> R;
bool visited[MAX_N];
int maxdist, point;
edge parent[MAX_N];

void dfs1(int u, int par, int val) {
    int i, mx = 0;

    if(val > maxdist) {
        maxdist = val;
        point = u;
    }

    for(i = 0; i < (int) adj[u].size(); i++) {
        edge v = adj[u][i];
        if(v.to == par) continue;

        dfs1(v.to, u, v.cost + val);
    }
}

void dfs2(int u, int par, int val) {
    visited[u] = 1;
    int i, mx = 0;

    if(val > maxdist) {
        maxdist = val;
        point = u;
    }

    for(i = 0; i < (int) adj[u].size(); i++) {
        edge v = adj[u][i];
        if(v.to == par) continue;

        parent[v.to] = edge(u, v.cost);
        dfs2(v.to, u, val+v.cost);
    }
}

int travelTime(int N, int M, int L, int A[], int B[], int T[]) {
    int i, ans = 0;

    for(i = 0; i < M; i++) {
        adj[A[i]].push_back(edge(B[i], T[i]));
        adj[B[i]].push_back(edge(A[i], T[i]));
    }

    for(i = 0; i < N; i++) {
        if(visited[i]) continue; 
        maxdist = -1; dfs1(i, i, 0); int one = point; 
        maxdist = -1; dfs2(one, one, 0); int two = point;
        
        ans = max(ans, maxdist);

        int able = maxdist/2, d = 0;

        for(i = two; i != one; i = parent[i].to) {
            if(d + parent[i].cost > able) {
                d = min(d + parent[i].cost, maxdist-d);
                break;
            } d += parent[i].cost;
        } R.push_back(d);
    } sort(R.begin(), R.end(), greater<int>());

    if(R.size() > 1) ans = max(ans, R[0]+L+R[1]);
    if(R.size() > 2) ans = max(ans, R[1]+L+L+R[2]);

    return ans;
}

Compilation message

dreaming.cpp: In function 'void dfs1(int, int, int)':
dreaming.cpp:16:12: warning: unused variable 'mx' [-Wunused-variable]
     int i, mx = 0;
            ^~
dreaming.cpp: In function 'void dfs2(int, int, int)':
dreaming.cpp:33:12: warning: unused variable 'mx' [-Wunused-variable]
     int i, mx = 0;
            ^~

Subtask #1
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 59 ms 12280 KB Output is correct
2 Correct 62 ms 12144 KB Output is correct
3 Correct 61 ms 9208 KB Output is correct
4 Correct 11 ms 4608 KB Output is correct
5 Correct 10 ms 4096 KB Output is correct
6 Correct 17 ms 5248 KB Output is correct
7 Incorrect 7 ms 3328 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 59 ms 12280 KB Output is correct
2 Correct 62 ms 12144 KB Output is correct
3 Correct 61 ms 9208 KB Output is correct
4 Correct 11 ms 4608 KB Output is correct
5 Correct 10 ms 4096 KB Output is correct
6 Correct 17 ms 5248 KB Output is correct
7 Incorrect 7 ms 3328 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #3
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 59 ms 12280 KB Output is correct
2 Correct 62 ms 12144 KB Output is correct
3 Correct 61 ms 9208 KB Output is correct
4 Correct 11 ms 4608 KB Output is correct
5 Correct 10 ms 4096 KB Output is correct
6 Correct 17 ms 5248 KB Output is correct
7 Incorrect 7 ms 3328 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #4
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 30 ms 6784 KB Output is correct
2 Correct 30 ms 6780 KB Output is correct
3 Correct 27 ms 6776 KB Output is correct
4 Correct 33 ms 6780 KB Output is correct
5 Correct 29 ms 6776 KB Output is correct
6 Correct 32 ms 7292 KB Output is correct
7 Correct 35 ms 6876 KB Output is correct
8 Correct 27 ms 6784 KB Output is correct
9 Correct 27 ms 6692 KB Output is correct
10 Correct 29 ms 6908 KB Output is correct
11 Correct 4 ms 3200 KB Output is correct
12 Correct 8 ms 4476 KB Output is correct
13 Correct 8 ms 4476 KB Output is correct
14 Correct 8 ms 4476 KB Output is correct
15 Correct 9 ms 4476 KB Output is correct
16 Correct 8 ms 4348 KB Output is correct
17 Correct 8 ms 4092 KB Output is correct
18 Correct 8 ms 4600 KB Output is correct
19 Correct 8 ms 4348 KB Output is correct
20 Correct 4 ms 3200 KB Output is correct
21 Correct 4 ms 3200 KB Output is correct
22 Correct 5 ms 3328 KB Output is correct
23 Correct 8 ms 4476 KB Output is correct

Subtask #5
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 59 ms 12280 KB Output is correct
2 Correct 62 ms 12144 KB Output is correct
3 Correct 61 ms 9208 KB Output is correct
4 Correct 11 ms 4608 KB Output is correct
5 Correct 10 ms 4096 KB Output is correct
6 Correct 17 ms 5248 KB Output is correct
7 Incorrect 7 ms 3328 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #6
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 59 ms 12280 KB Output is correct
2 Correct 62 ms 12144 KB Output is correct
3 Correct 61 ms 9208 KB Output is correct
4 Correct 11 ms 4608 KB Output is correct
5 Correct 10 ms 4096 KB Output is correct
6 Correct 17 ms 5248 KB Output is correct
7 Incorrect 7 ms 3328 KB Output isn't correct
8 Halted 0 ms 0 KB -