Submission #1196204

#TimeUsernameProblemLanguageResultExecution timeMemory
1196204countless철인 이종 경기 (APIO18_duathlon)C++20
Compilation error
0 ms0 KiB
#include <bits/stdc++.h> using namespace std; typedef long long ll; typedef long double ld; const ll MOD = 998244353; const ll INF = 1e18; const ld EPS = 1e-12; #define endl "\n" #define sp <<" "<< #define REP(i, a, b) for(ll i = a; i < b; i++) #define dbg(x) cout << #x << " = " << x << endl #define mp make_pair #define pb push_back #define fi first #define se second #define fast_io() ios_base::sync_with_stdio(false); cin.tie(NULL) #define all(x) (x).begin(), (x).end() #define rall(x) (x).rbegin(), (x).rend() #define sz(x) ((ll)(x).size()) struct custom_hash { static uint64_t splitmix64(uint64_t x) { // http://xorshift.di.unimi.it/splitmix64.c x += 0x9e3779b97f4a7c15; x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9; x = (x ^ (x >> 27)) * 0x94d049bb133111eb; return x ^ (x >> 31); } size_t operator()(uint64_t x) const { static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count(); return splitmix64(x + FIXED_RANDOM); } }; template <typename Key, typename Value> using hash_map = unordered_map<Key, Value, custom_hash>; mt19937 rng(chrono::steady_clock::now().time_since_epoch().count()); // uniform_int_distribution<int>(a, b)(rng); // shuffle(all(a), rng); void solution() { int n, m; cin >> n >> m; vector<vector<int>> adj(n); REP(i, 0, m) { int u, v; cin >> u >> v; --u, --v; adj[u].push_back(v); adj[v].push_back(u); } // subtask 3 vector<ll> pref(n+1); iota(all(pref), 0); REP(i, 1, n+1) { pref[i] += pref[i-1]; } REP(i, 1, n+1) { pref[i] += pref[i-1]; } ll ans = 0; vector<bool> vis(n); auto end = [&](this auto &&self, int u, int p = -1) -> ll { for (auto &v : adj[u]) { if (v != p) { return self(v, u); } } return u; }; auto size = [&](this auto &&self, int u, int p = -1) -> ll { vis[u] = true; for (auto &v : adj[u]) { if (v != p) { return self(v, u) + 1; } } return 1; }; auto find = [&](int u) -> ll { ll st = end(u); ll ln = size(st); if (ln <= 2) return 0; return 2LL * pref[n-2]; }; REP(i, 0, n) { if (vis[i]) continue; ans += find(i); } cout << ans << endl; return; } signed main() { fast_io(); solution(); return 0; } // Notes // is it binsearchable? // is it greedy? // is it DP? // if online round: search OEIS, similar topics // put observations together // check for edge cases // try "dumb" solutions, you're fast enough to rewrite // clean up the implementation // keep it simple // check for overflow // check for small N // check for array with same or monotonic a_i

Compilation message (stderr)

count_triplets.cpp: In function 'void solution()':
count_triplets.cpp:69:20: error: expected identifier before 'this'
   69 |     auto end = [&](this auto &&self, int u, int p = -1) -> ll {
      |                    ^~~~
count_triplets.cpp:69:20: error: expected ',' or '...' before 'this'
count_triplets.cpp: In lambda function:
count_triplets.cpp:70:28: error: 'u' was not declared in this scope
   70 |         for (auto &v : adj[u]) {
      |                            ^
count_triplets.cpp:71:22: error: 'p' was not declared in this scope
   71 |             if (v != p) {
      |                      ^
count_triplets.cpp:72:24: error: 'self' was not declared in this scope
   72 |                 return self(v, u);
      |                        ^~~~
count_triplets.cpp:76:16: error: 'u' was not declared in this scope
   76 |         return u;
      |                ^
count_triplets.cpp: In function 'void solution()':
count_triplets.cpp:79:21: error: expected identifier before 'this'
   79 |     auto size = [&](this auto &&self, int u, int p = -1) -> ll {
      |                     ^~~~
count_triplets.cpp:79:21: error: expected ',' or '...' before 'this'
count_triplets.cpp: In lambda function:
count_triplets.cpp:80:13: error: 'u' was not declared in this scope
   80 |         vis[u] = true;
      |             ^
count_triplets.cpp:83:22: error: 'p' was not declared in this scope
   83 |             if (v != p) {
      |                      ^
count_triplets.cpp:84:24: error: 'self' was not declared in this scope
   84 |                 return self(v, u) + 1;
      |                        ^~~~