oj.uz

Submission #928961

# Submission time Handle Problem Language Result Execution time Memory
928961 2024-02-17T09:57:24 Z Foolestboy Dreaming (IOI13_dreaming) C++14
14 / 100
 39 ms 18392 KB 
#ifndef GNORT
#include "dreaming.h"
#endif // GNORT
#include <bits/stdc++.h>

#define SQR(x)    (1LL * ((x) * (x)))
#define MASK(i)   (1LL << (i))
#define BIT(x, i) (((x) >> (i)) & 1)
#define fi        first
#define se        second
#define pb        push_back
#define all(x)    x.begin(), x.end()
#define rall(x)   x.rbegin(), x.rend()
#define sz(s)     (int)s.size()
#define prev      __prev
#define next      __next
#define left      __left
#define right     __right

#define mp make_pair
#define pii pair<int, int>
#define pll pair<ll, ll>
#define vi vector<int>
#define vll vector<ll>

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef unsigned int ui;

using namespace std;

const int mod = 1e9 + 7;
const int INF = 1e9 + 7;
const ll INFLL = (ll)2e18 + 7LL;
const ld PI = acos(-1);

const int dx[] = {1, -1, 0, 0, -1, 1, 1, -1};
const int dy[] = {0, 0, 1, -1, -1, -1, 1, 1};

template<class BUI, class TRONG>
    bool minimize(BUI &x, const TRONG y){
        if(x > y){
            x = y;
            return true;
        } else return false;
    }
template<class BUI, class TRONG>
    bool maximize(BUI &x, const TRONG y){
        if(x < y){
            x = y;
            return true;
        } else return false;
    }

/* Author : Bui Nguyen Duc Trong, Luong Van Chanh High School for the gifted*/
/* Template is copied by Trong */

                           /** Losing in Provincial Contests **/
                                    /** TRYING HARDER**/
                                   /**      ORZ     **/

/* -----------------[ MAIN CODE GOES HERE ]----------------- */

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

const int N = 1e5 + 10;

bool vis[N];
vector<pii> adj[N];
int high[N];
int cc;
vector<int> nodes[N];
int maxVal[N];

void dfs(int u, int p, int &x, bool take){
    vis[u] = 1;
    if(take) nodes[cc].push_back(u);
    if(high[u] > high[x]) x = u;
    for(auto [v, w] : adj[u]){
        if(v == p) continue;
        high[v] = high[u] + w;
        dfs(v, u, x, take);
    }
}

int f[N][2];

void dfs2(int u, int p, int k){
    for(auto [v, w] : adj[u]){
        if(v == p) continue;
        f[v][k] = f[u][k] + w;
        dfs2(v, u, k);
    }
}

int travelTime(int n, int m, int len, int A[], int B[], int T[]) {
    if(m == 0){
        return 2 * len;
    }
    for(int i = 0; i < m; i++){
        adj[A[i]].push_back(mp(B[i], T[i]));
        adj[B[i]].push_back(mp(A[i], T[i]));
    }
    int ans = 0;
    memset(maxVal, 0x3f, sizeof maxVal);
    for(int i = 0; i < n; i++){
        if(!vis[i]){
            ++cc;
            int x = i, y = i;
            dfs(i, 0, x, 1);
            for(int z : nodes[cc]) high[z] = 0;
            dfs(x, 0, y, 0);
            dfs2(x, 0, 0);
            dfs2(y, 0, 1);
            for(int z : nodes[cc]){
                maximize(ans, f[z][0] + f[z][1]);
                minimize(maxVal[cc], max(f[z][0], f[z][1]));
            }
        }
    }
    multiset<int, greater<>> st;
    for(int i = 1; i <= cc; i++) st.insert(maxVal[i]);
    int h = INF;
    for(int i = 1; i <= cc; i++){
        st.erase(st.find(maxVal[i]));
        int cost = 0;
        maximize(cost, *st.begin() + len + maxVal[i]);
        if(sz(st) >= 2){
            int tmp = 0;
            auto it = st.begin();
            tmp += *(it);
            ++it;
            tmp += *(it);
            maximize(cost, 2 * len + tmp);
        }
        st.insert(maxVal[i]);
        minimize(h, cost);
    }
    maximize(ans, h);
    return ans;
}

#ifdef GNORT
void solve(){
    int n, m, len; cin >> n >> m >> len;
    int A[101], B[101], T[101];
    for(int i = 0; i < m; i++){
        cin >> A[i] >> B[i] >> T[i];
    }
    cout << travelTime(n, m, len, A, B, T) << '\n';
}

signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);

    const bool multitest = 0;
    int tt = 1; if(multitest) cin >> tt;

    while( tt-- ){

        solve();

    }

    return 0;
}
#endif

Compilation message

dreaming.cpp: In function 'void dfs(int, int, int&, bool)':
dreaming.cpp:80:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   80 |     for(auto [v, w] : adj[u]){
      |              ^
dreaming.cpp: In function 'void dfs2(int, int, int)':
dreaming.cpp:90:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   90 |     for(auto [v, w] : adj[u]){
      |              ^

Subtask #1
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 38 ms 18272 KB Output is correct
2 Correct 37 ms 18392 KB Output is correct
3 Correct 24 ms 14800 KB Output is correct
4 Correct 7 ms 9308 KB Output is correct
5 Correct 6 ms 8284 KB Output is correct
6 Correct 11 ms 10076 KB Output is correct
7 Correct 2 ms 7516 KB Output is correct
8 Correct 19 ms 11280 KB Output is correct
9 Correct 25 ms 12752 KB Output is correct
10 Correct 2 ms 7772 KB Output is correct
11 Correct 34 ms 14140 KB Output is correct
12 Correct 38 ms 16084 KB Output is correct
13 Correct 2 ms 7768 KB Output is correct

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 7516 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 38 ms 18272 KB Output is correct
2 Correct 37 ms 18392 KB Output is correct
3 Correct 24 ms 14800 KB Output is correct
4 Correct 7 ms 9308 KB Output is correct
5 Correct 6 ms 8284 KB Output is correct
6 Correct 11 ms 10076 KB Output is correct
7 Correct 2 ms 7516 KB Output is correct
8 Correct 19 ms 11280 KB Output is correct
9 Correct 25 ms 12752 KB Output is correct
10 Correct 2 ms 7772 KB Output is correct
11 Correct 34 ms 14140 KB Output is correct
12 Correct 38 ms 16084 KB Output is correct
13 Correct 2 ms 7768 KB Output is correct
14 Incorrect 2 ms 7516 KB Output isn't correct
15 Halted 0 ms 0 KB -

Subtask #4
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 39 ms 14616 KB Output is correct
2 Correct 38 ms 14676 KB Output is correct
3 Correct 37 ms 14672 KB Output is correct
4 Correct 37 ms 14680 KB Output is correct
5 Correct 36 ms 14672 KB Output is correct
6 Correct 39 ms 14936 KB Output is correct
7 Correct 39 ms 14924 KB Output is correct
8 Correct 35 ms 14416 KB Output is correct
9 Correct 36 ms 14416 KB Output is correct
10 Correct 38 ms 15184 KB Output is correct
11 Correct 2 ms 7516 KB Output is correct
12 Correct 31 ms 15568 KB Output is correct
13 Correct 30 ms 15452 KB Output is correct
14 Correct 31 ms 15412 KB Output is correct
15 Correct 31 ms 15452 KB Output is correct
16 Correct 31 ms 15452 KB Output is correct
17 Correct 33 ms 15448 KB Output is correct
18 Correct 31 ms 15452 KB Output is correct
19 Correct 31 ms 15452 KB Output is correct
20 Incorrect 1 ms 5468 KB Output isn't correct
21 Halted 0 ms 0 KB -

Subtask #5
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 7516 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 38 ms 18272 KB Output is correct
2 Correct 37 ms 18392 KB Output is correct
3 Correct 24 ms 14800 KB Output is correct
4 Correct 7 ms 9308 KB Output is correct
5 Correct 6 ms 8284 KB Output is correct
6 Correct 11 ms 10076 KB Output is correct
7 Correct 2 ms 7516 KB Output is correct
8 Correct 19 ms 11280 KB Output is correct
9 Correct 25 ms 12752 KB Output is correct
10 Correct 2 ms 7772 KB Output is correct
11 Correct 34 ms 14140 KB Output is correct
12 Correct 38 ms 16084 KB Output is correct
13 Correct 2 ms 7768 KB Output is correct
14 Incorrect 2 ms 7516 KB Output isn't correct
15 Halted 0 ms 0 KB -