Submission #417481

#	Time	Username	Problem	Language	Result	Execution time	Memory
417481		iulia13	Dreaming (IOI13_dreaming)	C++14	18 / 100	57 ms	13544 KiB

dreaming

#include <bits/stdc++.h>
#include "dreaming.h"
using namespace std;
const int N = 1e5 + 5;
struct ura{
    int x, c;
};
vector <ura> g[N];
int maxi = 2e9, dp[N], dp2[N], dp_up[N];
int lover[N];
int viz[N];
vector <int> A;
void dfs(int nod, int dad = -1)
{
    viz[nod] = 1;
    for (auto son : g[nod])
    {
        if (son.x == dad)
            continue;
        dfs(son.x, nod);
        if (dp[nod] < dp[son.x] + son.c)
        {
            dp2[nod] = dp[nod];
            dp[nod] = dp[son.x] + son.c;
        }
        else
            dp2[nod] = max(dp2[nod], dp[son.x] + son.c);
    }
}
void dfs2(int nod, int dad = -1)
{
    for (auto son : g[nod])
    {
        if (son.x == dad)
            continue;
        int c = dp[nod];
        if (c == dp[son.x] + son.c)
            c = dp2[nod];
        dp_up[son.x] = max(dp_up[nod], c) + son.c;
        dfs2(son.x, nod);
    }
    lover[nod] = max(dp_up[nod], dp[nod]);
    maxi = min(lover[nod], maxi);
}
int travelTime(int n, int m, int l, int a[], int b[], int t[])
{
    int i, j;
    for (i = 0; i < m; i++)
    {
        g[a[i]].push_back({b[i], t[i]});
        g[b[i]].push_back({a[i], t[i]});
    }
    for (i = 0; i < n; i++)
    {
        if (viz[i])
            continue;
        maxi = 2e9;
        dfs(i);
        dfs2(i);
        A.push_back(maxi);
    }
    if (A.size() == 1)
        return A[0];
    sort(A.begin(), A.end());
    reverse(A.begin(), A.end());
    int c = A[0] + A[1] + l;
    if (A.size() == 2)
        return c;
    else
        return max(c, A[1] + A[2] + 2 * l);
}/*
int a[N];
int b[N];
int t[N];
int main()
{
    int n, m, l, i;
    cin >> n >> m >> l;
    for (i = 0; i < m; i++)
        cin >> a[i] >> b[i] >> t[i];
    cout << travelTime(n, m, l, a, b, t);
    return 0;
}*/

Compilation message (stderr)

dreaming.cpp: In function 'int travelTime(int, int, int, int*, int*, int*)':
dreaming.cpp:47:12: warning: unused variable 'j' [-Wunused-variable]
   47 |     int i, j;
      |            ^

• Subtask 1: 0 / 14
• Subtask 2: 0 / 10
• Subtask 3: 0 / 23
• Subtask 4: 18 / 18
• Subtask 5: 0 / 12
• Subtask 6: 0 / 23