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Submission #928960

# Submission time Handle Problem Language Result Execution time Memory
928960 2024-02-17T09:51:01 Z Foolestboy Dreaming (IOI13_dreaming) C++14
14 / 100
 44 ms 19036 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){
    vis[u] = 1;
    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);
    }
}

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[]) {
    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);
            for(int z : nodes[cc]) high[z] = 0;
            dfs(x, 0, y);
            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&)':
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 41 ms 19036 KB Output is correct
2 Correct 38 ms 18888 KB Output is correct
3 Correct 26 ms 15140 KB Output is correct
4 Correct 7 ms 9308 KB Output is correct
5 Correct 6 ms 8536 KB Output is correct
6 Correct 12 ms 10208 KB Output is correct
7 Correct 2 ms 7516 KB Output is correct
8 Correct 21 ms 11484 KB Output is correct
9 Correct 25 ms 13092 KB Output is correct
10 Correct 2 ms 7768 KB Output is correct
11 Correct 38 ms 14604 KB Output is correct
12 Correct 39 ms 16592 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 41 ms 19036 KB Output is correct
2 Correct 38 ms 18888 KB Output is correct
3 Correct 26 ms 15140 KB Output is correct
4 Correct 7 ms 9308 KB Output is correct
5 Correct 6 ms 8536 KB Output is correct
6 Correct 12 ms 10208 KB Output is correct
7 Correct 2 ms 7516 KB Output is correct
8 Correct 21 ms 11484 KB Output is correct
9 Correct 25 ms 13092 KB Output is correct
10 Correct 2 ms 7768 KB Output is correct
11 Correct 38 ms 14604 KB Output is correct
12 Correct 39 ms 16592 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 44 ms 14672 KB Output is correct
2 Correct 39 ms 14684 KB Output is correct
3 Correct 44 ms 14680 KB Output is correct
4 Correct 38 ms 14764 KB Output is correct
5 Correct 38 ms 14684 KB Output is correct
6 Correct 41 ms 15292 KB Output is correct
7 Correct 41 ms 14940 KB Output is correct
8 Correct 37 ms 14428 KB Output is correct
9 Correct 40 ms 14616 KB Output is correct
10 Correct 41 ms 15172 KB Output is correct
11 Correct 2 ms 7516 KB Output is correct
12 Correct 32 ms 15364 KB Output is correct
13 Correct 33 ms 15448 KB Output is correct
14 Correct 34 ms 15552 KB Output is correct
15 Correct 33 ms 15452 KB Output is correct
16 Correct 34 ms 15616 KB Output is correct
17 Correct 36 ms 15452 KB Output is correct
18 Correct 33 ms 15452 KB Output is correct
19 Correct 33 ms 15452 KB Output is correct
20 Incorrect 2 ms 7768 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 41 ms 19036 KB Output is correct
2 Correct 38 ms 18888 KB Output is correct
3 Correct 26 ms 15140 KB Output is correct
4 Correct 7 ms 9308 KB Output is correct
5 Correct 6 ms 8536 KB Output is correct
6 Correct 12 ms 10208 KB Output is correct
7 Correct 2 ms 7516 KB Output is correct
8 Correct 21 ms 11484 KB Output is correct
9 Correct 25 ms 13092 KB Output is correct
10 Correct 2 ms 7768 KB Output is correct
11 Correct 38 ms 14604 KB Output is correct
12 Correct 39 ms 16592 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 -