Submission #1097003

#	Time	Username	Problem	Language	Result	Execution time	Memory
1097003		thangdz2k7	City Mapping (NOI18_citymapping)	C++17	100 / 100	14 ms	6144 KiB

citymapping

// author : thembululquaUwU
// 3.9.2024

#include <bits/stdc++.h>
#include "citymapping.h"
#define pb push_back
#define fi first
#define se second
#define endl '\n'

using namespace std;
using ll = long long;
using ii = pair <int, int>;
using vi = vector <int>;

const int N = 1e3 + 5;
const int mod = 1e9 + 7;

void maxl(auto &a, auto b) {a = max(a, b);}
void minl(auto &a, auto b) {a = min(a, b);}

ll d[N][N];

ll dist(int x, int y){
    if (x > y) swap(x, y);
    if (x == y) return 0;
    if (!d[x][y]) d[x][y] = get_distance(x, y);
    return d[x][y];

}

bool del[N];
int sz[N], heavy[N];
vi adj[N];

void dfs(int u){
    sz[u] = 1, heavy[u] = 0;
    for (int v : adj[u]) if (!del[v]){
        dfs(v); sz[u] += sz[v];
        if (sz[v] > sz[heavy[u]]) heavy[u] = v;
    }
}

void find_roads(int n, int q, int a[], int b[], int w[]){
    vector <int> sr;
    for (int i = 2; i < n + 1; ++ i) sr.pb(i);
    sort(sr.begin(), sr.end(), [&](int u, int v){
        return dist(1, u) < dist(1, v);
    });

    int nE = 0;
    for (int u : sr){
        int r = 1;
        for (int i = 1; i <= n; ++ i) del[i] = 0;
        while (true){
            dfs(r); vi path = {r};
            while (heavy[r]) r = heavy[r], path.pb(r);
            if (path.size() == 1) break;
            ll x = dist(1, path.back()) + dist(1, u) - dist(u, path.back()); x /= 2;
            for (int u : path) if (dist(1, u) == x) {
                r = u; //break;
            } else del[u] = 1;
        }
        adj[r].pb(u); a[nE] = r, b[nE] = u, w[nE] = d[1][u] - d[1][r],  ++ nE;
    }
}

//void solve(){
//
//}
//
//int main(){
//    if (fopen("pqh.inp", "r")){
//        freopen("pqh.inp", "r", stdin);
//        freopen("pqh.out", "w", stdout);
//    }
//    ios_base::sync_with_stdio(0);
//    cin.tie(0); cout.tie(0);
//
//    int t = 1; // cin >> t;
//    while (t --) solve();
//    return 0;
//}

Compilation message (stderr)

citymapping.cpp:19:11: warning: use of 'auto' in parameter declaration only available with '-fconcepts-ts'
   19 | void maxl(auto &a, auto b) {a = max(a, b);}
      |           ^~~~
citymapping.cpp:19:20: warning: use of 'auto' in parameter declaration only available with '-fconcepts-ts'
   19 | void maxl(auto &a, auto b) {a = max(a, b);}
      |                    ^~~~
citymapping.cpp:20:11: warning: use of 'auto' in parameter declaration only available with '-fconcepts-ts'
   20 | void minl(auto &a, auto b) {a = min(a, b);}
      |           ^~~~
citymapping.cpp:20:20: warning: use of 'auto' in parameter declaration only available with '-fconcepts-ts'
   20 | void minl(auto &a, auto b) {a = min(a, b);}
      |                    ^~~~

• Subtask 1: 9 / 9
• Subtask 2: 16 / 16
• Subtask 3: 13 / 13
• Subtask 4: 19 / 19
• Subtask 5: 43 / 43