Submission #1189054

#TimeUsernameProblemLanguageResultExecution timeMemory
1189054Mher777Fire (BOI24_fire)C++20
100 / 100
473 ms139788 KiB
#define _CRT_SECURE_NO_WARNINGS #include <iostream> #include <iomanip> #include <array> #include <string> #include <algorithm> #include <cmath> #include <set> #include <map> #include <unordered_set> #include <unordered_map> #include <vector> #include <stack> #include <queue> #include <deque> #include <bitset> #include <list> #include <iterator> #include <numeric> #include <complex> #include <utility> #include <random> #include <cassert> #include <fstream> using namespace std; mt19937 rnd(time(nullptr)); /* -------------------- Typedefs -------------------- */ typedef int itn; typedef long long ll; typedef unsigned long long ull; typedef double db; typedef float fl; typedef long double ld; /* -------------------- Usings -------------------- */ using vi = vector<int>; using vll = vector<ll>; using mii = map<int, int>; using mll = map<ll, ll>; using pii = pair<int, int>; using pll = pair<ll, ll>; /* -------------------- Defines -------------------- */ #define ff first #define ss second #define pub push_back #define pob pop_back #define puf push_front #define pof pop_front #define mpr make_pair #define yes cout<<"Yes\n" #define no cout<<"No\n" #define all(x) (x).begin(), (x).end() #define USACO freopen("feast.in", "r", stdin); freopen("feast.out", "w", stdout); /* -------------------- Constants -------------------- */ const int dx[8] = { -1, 0, 1, 0, -1, -1, 1, 1 }; const int dy[8] = { 0, -1, 0, 1, -1, 1, -1, 1 }; const int MAX = int(1e9 + 5); const ll MAXL = ll(2e18) + 5ll; const ll MOD = ll(1000000007); const ll MOD2 = ll(998244353); /* -------------------- Functions -------------------- */ void fastio() { ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0); } void precision(int x) { cout.setf(ios::fixed | ios::showpoint); cout.precision(x); } ll gcd(ll a, ll b) { if (a == 0 || b == 0) return 0; while (b) { a %= b; swap(a, b); } return a; } ll lcm(ll a, ll b) { return a / gcd(a, b) * b; } ll range_sum(ll a, ll b) { if (a > b) return 0ll; ll dif = a - 1, cnt = b - a + 1; ll ans = ((b - a + 1) * (b - a + 2)) / 2; ans += ((b - a + 1) * dif); return ans; } string dec_to_bin(ll a) { string s = ""; for (ll i = a; i > 0; ) { ll k = i % 2; i /= 2; char c = k + 48; s += c; } if (a == 0) { s = "0"; } reverse(all(s)); return s; } ll bin_to_dec(string s) { ll num = 0; for (int i = 0; i < s.size(); i++) { num *= 2ll; num += (s[i] - '0'); } return num; } ll factorial_by_mod(ll n, ll mod) { ll ans = 1; ll num; for (ll i = 1; i <= n; ++i) { num = i % mod; ans *= num; ans %= mod; } return ans; } bool isPrime(ll a) { if (a == 1) return false; for (ll i = 2; i * i <= a; i++) { if (a % i == 0) return false; } return true; } ll binpow(ll a, ll b) { if (!a) return 0; ll ans = 1; while (b) { if (b & 1) { ans *= a; } b >>= 1; a *= a; } return ans; } ll binpow_by_mod(ll a, ll b, ll mod) { if (!a) return 0; ll ans = 1; while (b) { if (b & 1) { ans *= a; ans %= mod; } b >>= 1; a *= a; a %= mod; } return ans; } /* -------------------- Solution -------------------- */ const int N = 800005, M = 30; pii lines[N]; int up[N][M], to[N], till[N]; int n, m, cur, lg; void slv() { cin >> n >> m; set<int> st; map<int, int> id; lg = log2(n); int mn = MAX, mx = 0; for (int i = 1; i <= n; ++i) { cin >> lines[i].ff >> lines[i].ss; if (lines[i].ff == 0) { mx = max(mx, lines[i].ss); } else if (lines[i].ss == 0) { mn = min(mn, lines[i].ff); } st.insert(lines[i].ff); st.insert(lines[i].ss); } m = (int)st.size(); for (auto elem : st) { id[elem] = ++cur; } for (int i = 1; i <= n; ++i) { lines[i].ff = id[lines[i].ff]; lines[i].ss = id[lines[i].ss]; if (lines[i].ss < lines[i].ff) { to[lines[i].ff] = max(to[lines[i].ff], lines[i].ss + m); } else { to[lines[i].ff] = max(to[lines[i].ff], lines[i].ss); to[lines[i].ff + m] = max(to[lines[i].ff + m], lines[i].ss + m); } } for (int i = 1; i <= m * 2; ++i) { till[i] = max({ till[i - 1],to[i],i }); } for (int i = m * 2; i >= 1; --i) { up[i][0] = till[i]; for (int l = 1; l <= lg; ++l) { up[i][l] = up[up[i][l - 1]][l - 1]; } } int ans = MAX; for (int i = 1; i <= m; ++i) { int u = i; int answ = 0; for (int l = lg; l >= 0; --l) { if (up[u][l] >= i + m) continue; u = up[u][l]; answ += (1 << l); } if (up[u][0] < i + m) continue; ++answ; ans = min(ans, answ); } cout << (ans == MAX ? -1 : ans); } void cs() { int tstc = 1; //cin >> tstc; while (tstc--) { slv(); } } void precalc() { return; } int main() { fastio(); precalc(); //precision(0); cs(); return 0; }
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