oj.uz

Submission #167983

# Submission time Handle Problem Language Result Execution time Memory
167983 2019-12-11T06:01:06 Z davitmarg Dreaming (IOI13_dreaming) C++17
18 / 100
 138 ms 26464 KB 
/*DavitMarg*/
#include <iostream>
#include <algorithm>
#include <cmath>
#include <vector>
#include <string>
#include <cstring>
#include <map>
#include <unordered_map>
#include <set>
#include <queue>
#include <iomanip>
#include <bitset>
#include <stack>
#include <cassert>
#include <iterator>
#include <fstream>
#define mod 1000000000ll
#define LL long long
#define LD long double
#define MP make_pair
#define PB push_back
#define all(v) v.begin(), v.end()
using namespace std;

const int N = 100005;

#ifndef death
#include "dreaming.h"
#endif

int n, used[N];
LL x, ans[N], mx[N];
vector<pair<int, LL>> g[N];
vector<LL> dp[N];

void dfs(int v)
{
    used[v] = 1;
    dp[v].PB(0);
    dp[v].PB(0);
    for (int i = 0; i < g[v].size(); i++)
    {
        int to = g[v][i].first;
        LL d = g[v][i].second;
        if (used[to])
            continue;
        dfs(to);
        dp[v].PB(dp[to][0] + d);
        mx[v] = max(mx[v], mx[to]);
    }
    sort(all(dp[v]));
    reverse(all(dp[v]));
    mx[v] = dp[v][0] + dp[v][1];
}

void dfs2(int v, int p, LL dist)
{
    vector<LL> d;
    d.PB(dp[v][0]);
    d.PB(dp[v][1]);
    d.PB(dist);
    sort(all(d));
    reverse(all(d));
    ans[v] = mod * mod;
    if (d[0] + d[1] == mx[v])
        ans[v] = min(ans[v], max(d[0], d[1]));

    for (int i = 0; i < g[v].size(); i++)
    {
        int to = g[v][i].first;
        LL d = g[v][i].second;
        if (to == p)
            continue;
        LL newdist = dist;
        if (dp[to][0] + d == dp[v][0])
            newdist = max(newdist, dp[v][1]);
        else
            newdist = max(newdist, dp[v][0]);
        newdist += d;
        mx[to] = max(mx[v], mx[to]);
        dfs2(to, v, newdist);
        ans[v] = min(ans[v], ans[to]);
    }
}

int travelTime(int N, int M, int L, int A[], int B[], int T[])
{
    n = N;
    x = L;
    while (M--)
    {
        g[A[M]].PB(MP(B[M], T[M]));
        g[B[M]].PB(MP(A[M], T[M]));
    }
    vector<LL> res;
    for (int i = 0; i < n; i++)
    {
        if (used[i])
            continue;
        dfs(i);
        dfs2(i, -1, 0);
        //cout << ans[i] << " !\n";
        assert(ans[i] != mod * mod);
        res.PB(ans[i]);
    }
    sort(all(res));
    reverse(all(res));
    LL ANS = 0;
    if (res.size() == 1)
        ANS = mx[0];
    else
    {
        ANS = x + res[0] + res[1];
        if (res.size() > 2)
            ANS = max(ANS, res[1] + res[2] + x + x);
    }
    return ANS;
}

#ifdef death

int main()
{
    int N, M, L, A[102], B[102], D[102];
    cin >> N >> M >> L;
    for (int i = 0; i < M; i++)
        cin >> A[i] >> B[i] >> D[i];
    cout << travelTime(N, M, L, A, B, D) << endl;
    return 0;
}

#endif

/*

12 8 2 
0 8 4
8 2 2
2 7 4
5 11 3
5 1 7
1 3 1
1 9 5
10 6 3

*/

Compilation message

dreaming.cpp: In function 'void dfs(int)':
dreaming.cpp:42:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < g[v].size(); i++)
                     ~~^~~~~~~~~~~~~
dreaming.cpp: In function 'void dfs2(int, int, long long int)':
dreaming.cpp:69:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < g[v].size(); i++)
                     ~~^~~~~~~~~~~~~

Subtask #1
0 / 14.0

# Verdict Execution time Memory Grader output
1 Incorrect 138 ms 26464 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 138 ms 26464 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 138 ms 26464 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 73 ms 13540 KB Output is correct
2 Correct 74 ms 13552 KB Output is correct
3 Correct 75 ms 13552 KB Output is correct
4 Correct 74 ms 13680 KB Output is correct
5 Correct 73 ms 13420 KB Output is correct
6 Correct 80 ms 14576 KB Output is correct
7 Correct 73 ms 13936 KB Output is correct
8 Correct 72 ms 13444 KB Output is correct
9 Correct 72 ms 13296 KB Output is correct
10 Correct 72 ms 13804 KB Output is correct
11 Correct 6 ms 5240 KB Output is correct
12 Correct 40 ms 10984 KB Output is correct
13 Correct 40 ms 10988 KB Output is correct
14 Correct 40 ms 11120 KB Output is correct
15 Correct 40 ms 10984 KB Output is correct
16 Correct 41 ms 10944 KB Output is correct
17 Correct 39 ms 10988 KB Output is correct
18 Correct 40 ms 10984 KB Output is correct
19 Correct 40 ms 10996 KB Output is correct
20 Correct 6 ms 5112 KB Output is correct
21 Correct 6 ms 5112 KB Output is correct
22 Correct 7 ms 5212 KB Output is correct
23 Correct 40 ms 10988 KB Output is correct

Subtask #5
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 138 ms 26464 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 138 ms 26464 KB Output isn't correct
2 Halted 0 ms 0 KB -