제출 #961947

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
961947		Mher777	Event Hopping (BOI22_events)	C++17	40 / 100	234 ms	102484 KiB

events

#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(7069);

/* -------------------- 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 MAX = int(2e9 + 5);
const ll MAXL = ll(1e18) + 5ll;
const ll MOD = ll(998244353);
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(max(a, b));
    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;
}

int isPrime(ll a) {
    if (a == 1) return 0;
    for (ll i = 2; i * i <= a; i++) {
        if (a % i == 0) return 0;
    }
    return 1;
}

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 = 100005, M = 5005;
int ansx[M][M];
int id[N];
pii ran[N];
pair<pii, int> a[N];
int n, q, m;

void slv() {
    cin >> n >> q;
    for (int i = 1; i <= n; ++i) {
        cin >> ran[i].ff >> ran[i].ss;
        a[i] = { {ran[i].ss,ran[i].ff},i };
    }
    sort(a + 1, a + n + 1);
    for (int i = 1; i <= n; ++i) {
        id[a[i].ss] = i;
    }
    if (n <= 5000) {
        vector<pii> st;
        for (int l = 1; l <= n; ++l) {
            st.clear();
            st.pub(mpr(a[l].ff.ff, 0));
            int val;
            for (int i = l + 1; i <= n; ++i) {
                int ind = lower_bound(all(st), mpr(a[i].ff.ss, -1)) - st.begin();
                if (ind == st.size()) val = MAX;
                else val = st[ind].ss;
                if (val == MAX) {
                    ansx[a[l].ss][a[i].ss] = -1;
                    continue;
                }
                ++val;
                ansx[a[l].ss][a[i].ss] = val;
                while (!st.empty()) {
                    if (st.back().ss >= val) st.pop_back();
                    else break;
                }
                st.pub(mpr(a[i].ff.ff, val));
            }
        }
        while (q--) {
            int l, r;
            cin >> l >> r;
            if (l == r) {
                cout << 0 << '\n';
                continue;
            }
            if (ran[l].ss == ran[r].ss) {
                cout << 1 << '\n';
                continue;
            }
            if (id[r] < id[l]) {
                cout << "impossible\n";
                continue;
            }
            if (ansx[l][r] == -1) {
                cout << "impossible\n";
                continue;
            }
            cout << ansx[l][r] << '\n';
        }
        return;
    }
    if (q <= 100) {
        vector<pii> st;
        while (q--) {
            int l, r;
            cin >> l >> r;
            if (l == r) {
                cout << 0 << '\n';
                continue;
            }
            if (ran[l].ss == ran[r].ss) {
                cout << 1 << '\n';
                continue;
            }
            l = id[l], r = id[r];
            if (r < l) {
                cout << "impossible\n";
                continue;
            }
            st.clear();
            st.pub(mpr(a[l].ff.ff,0));
            int val;
            for (int i = l + 1; i <= r; ++i) {
                int ind = lower_bound(all(st), mpr(a[i].ff.ss, -1)) - st.begin();
                if (ind == st.size()) val = MAX;
                else val = st[ind].ss;
                if (val == MAX) continue;
                ++val;
                while (!st.empty()) {
                    if (st.back().ss >= val) st.pop_back();
                    else break;
                }
                st.pub(mpr(a[i].ff.ff, val));
            }
            if (val == MAX) cout << "impossible\n";
            else cout << val << '\n';
        }
        return;
    }
}

void cs() {
    int tstc = 1;
    //cin >> tstc;
    while (tstc--) {
        slv();
    }
}

void precalc() {
    return;
}

int main() {
    fastio();
    precalc();
    //precision(0);
    cs();
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

events.cpp: In function 'll range_sum(ll, ll)':
events.cpp:95:21: warning: unused variable 'cnt' [-Wunused-variable]
   95 |     ll dif = a - 1, cnt = b - a + 1;
      |                     ^~~
events.cpp: In function 'll bin_to_dec(std::string)':
events.cpp:118:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  118 |     for (int i = 0; i < s.size(); i++) {
      |                     ~~^~~~~~~~~~
events.cpp: In function 'void slv()':
events.cpp:199:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  199 |                 if (ind == st.size()) val = MAX;
      |                     ~~~~^~~~~~~~~~~~
events.cpp:260:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  260 |                 if (ind == st.size()) val = MAX;
      |                     ~~~~^~~~~~~~~~~~
events.cpp:271:33: warning: 'val' may be used uninitialized in this function [-Wmaybe-uninitialized]
  271 |             else cout << val << '\n';
      |                                 ^~~~

• Subtask 1: 0 / 10
• Subtask 2: 10 / 10
• Subtask 3: 15 / 15
• Subtask 4: 15 / 15
• Subtask 5: 0 / 20
• Subtask 6: 0 / 30