oj.uz

답안 #961925

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
961925 2024-04-12T18:47:03 Z Mher777 Event Hopping (BOI22_events) C++17
10 / 100
 1500 ms 31848 KB 
#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 = 400005;
int id[N], t[N * 4], p[N];
pii ran[N];
mii pox;
pair<pii, int> a[N];
int n, q, m;

void bld(int l = 1, int r = m, int pos = 1) {
    t[pos] = MAX;
    if (l == r) {
        p[l] = pos;
        return;
    }
    int mid = (l + r) / 2;
    bld(l, mid, 2 * pos);
    bld(mid + 1, r, 2 * pos + 1);
}

int qry(int l, int r, int tl = 1, int tr = m, int pos = 1) {
    if (l == tl && r == tr) {
        return t[pos];
    }
    int mid = (tl + tr) / 2;
    if (mid >= r) {
        return qry(l, r, tl, mid, 2 * pos);
    }
    if (mid < l) {
        return qry(l, r, mid + 1, tr, 2 * pos + 1);
    }
    return min(qry(l, mid, tl, mid, 2 * pos), qry(mid + 1, r, mid + 1, tr, 2 * pos + 1));
}

void upd(int pos, int val) {
    pos = p[pos];
    t[pos] = min(t[pos], val);
    pos /= 2;
    while (pos) {
        t[pos] = min(t[2 * pos], t[2 * pos + 1]);
        pos /= 2;
    }
}

void slv() {
    cin >> n >> q;
    set<int> st;
    for (int i = 1; i <= n; ++i) {
        cin >> ran[i].ff >> ran[i].ss;
        st.insert(ran[i].ff);
        st.insert(ran[i].ss);
    }
    for (auto elem : st) {
        pox[elem] = ++m;
    }
    for (int i = 1; i <= n; ++i) {
        a[i] = { {pox[ran[i].ss],pox[ran[i].ff]},i };
    }
    sort(a + 1, a + n + 1);
    for (int i = 1; i <= n; ++i) {
        id[a[i].ss] = i;
    }
    if (q <= 100) {
        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;
            }
            bld();
            upd(a[l].ff.ff, 0);
            int val;
            for (int i = l + 1; i <= r; ++i) {
                val = qry(a[i].ff.ss, a[i].ff.ff);
                if (val == MAX) continue;
                ++val;
                upd(a[i].ff.ff, val);
            }
            if (val == MAX) cout << "impossible\n";
            else cout << val << '\n';
        }
    }
}

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

void precalc() {
    return;
}

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

Compilation message

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:261:33: warning: 'val' may be used uninitialized in this function [-Wmaybe-uninitialized]
  261 |             else cout << val << '\n';
      |                                 ^~~~

Subtask #1
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 8540 KB Output is correct
2 Incorrect 99 ms 15956 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 8540 KB Output is correct
2 Correct 1 ms 8540 KB Output is correct
3 Correct 7 ms 8540 KB Output is correct
4 Correct 4 ms 8540 KB Output is correct
5 Correct 3 ms 8540 KB Output is correct
6 Correct 3 ms 8540 KB Output is correct
7 Correct 5 ms 8796 KB Output is correct
8 Correct 6 ms 8796 KB Output is correct
9 Correct 1 ms 4444 KB Output is correct

Subtask #3
0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 8540 KB Output is correct
2 Correct 1 ms 8540 KB Output is correct
3 Correct 7 ms 8540 KB Output is correct
4 Correct 4 ms 8540 KB Output is correct
5 Correct 3 ms 8540 KB Output is correct
6 Correct 3 ms 8540 KB Output is correct
7 Correct 5 ms 8796 KB Output is correct
8 Correct 6 ms 8796 KB Output is correct
9 Correct 1 ms 4444 KB Output is correct
10 Correct 1 ms 8540 KB Output is correct
11 Correct 1 ms 8540 KB Output is correct
12 Correct 7 ms 8780 KB Output is correct
13 Correct 3 ms 8536 KB Output is correct
14 Correct 3 ms 8540 KB Output is correct
15 Correct 3 ms 8540 KB Output is correct
16 Correct 5 ms 8796 KB Output is correct
17 Correct 4 ms 8796 KB Output is correct
18 Correct 1 ms 4444 KB Output is correct
19 Incorrect 4 ms 5012 KB Output isn't correct
20 Halted 0 ms 0 KB -

Subtask #4
0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 8540 KB Output is correct
2 Correct 1 ms 8540 KB Output is correct
3 Correct 7 ms 8540 KB Output is correct
4 Correct 4 ms 8540 KB Output is correct
5 Correct 3 ms 8540 KB Output is correct
6 Correct 3 ms 8540 KB Output is correct
7 Correct 5 ms 8796 KB Output is correct
8 Correct 6 ms 8796 KB Output is correct
9 Correct 1 ms 4444 KB Output is correct
10 Correct 1 ms 8540 KB Output is correct
11 Correct 1 ms 8540 KB Output is correct
12 Correct 7 ms 8540 KB Output is correct
13 Correct 3 ms 8540 KB Output is correct
14 Correct 3 ms 8536 KB Output is correct
15 Correct 3 ms 8540 KB Output is correct
16 Correct 4 ms 8796 KB Output is correct
17 Correct 4 ms 8796 KB Output is correct
18 Correct 1 ms 4444 KB Output is correct
19 Correct 1112 ms 20252 KB Output is correct
20 Correct 294 ms 20440 KB Output is correct
21 Correct 398 ms 20048 KB Output is correct
22 Correct 259 ms 25684 KB Output is correct
23 Correct 610 ms 31520 KB Output is correct
24 Execution timed out 1518 ms 31848 KB Time limit exceeded
25 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 101 ms 15956 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 8540 KB Output is correct
2 Incorrect 99 ms 15956 KB Output isn't correct
3 Halted 0 ms 0 KB -