oj.uz

Submission #961954

# Submission time Handle Problem Language Result Execution time Memory
961954 2024-04-12T20:02:04 Z Mher777 Event Hopping (BOI22_events) C++17
50 / 100
 246 ms 106296 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 = 100005, M = 5005;
int ansx[M][M];
int id[N], to[N], dep[N], tin[N], tout[N];
vi g[N];
pii ran[N];
pair<pii, int> a[N];
int n, q, timer;

void dfs(int u) {
    tin[u] = ++timer;
    for (auto v : g[u]) {
        dep[v] = dep[u] + 1;
        dfs(v);
    }
    tout[u] = ++timer;
}

bool upper(int u, int v) {
    return tin[u] <= tin[v] && tout[u] >= tout[v];
}

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;
    }
    int mn = MAX, ind = -1;
    for (int i = n; i >= 1; --i) {
        if (mn <= a[i].ff.ff) {
            to[a[i].ss] = ind;
            g[ind].pub(a[i].ss);
        }
        if (a[i].ff.ss < mn) {
            mn = a[i].ff.ss;
            ind = a[i].ss;
        }
    }
    for (int i = 1; i <= n; ++i) {
        if (!to[i]) dfs(i);
    }
    while (q--) {
        int l, r;
        cin >> l >> r;
        if (l == r) {
            cout << 0 << '\n';
            continue;
        }
        if (ran[r].ss == ran[l].ss) {
            cout << 1 << '\n';
            continue;
        }
        if (!upper(r, l)) {
            cout << "impossible\n";
        }
        else {
            cout << dep[l] - dep[r] << '\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:213:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  213 |                 if (ind == st.size()) val = MAX;
      |                     ~~~~^~~~~~~~~~~~
events.cpp:274:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  274 |                 if (ind == st.size()) val = MAX;
      |                     ~~~~^~~~~~~~~~~~
events.cpp:285:33: warning: 'val' may be used uninitialized in this function [-Wmaybe-uninitialized]
  285 |             else cout << val << '\n';
      |                                 ^~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 8536 KB Output is correct
2 Correct 54 ms 18252 KB Output is correct
3 Correct 52 ms 18260 KB Output is correct
4 Correct 58 ms 18168 KB Output is correct
5 Correct 53 ms 17492 KB Output is correct
6 Correct 59 ms 16672 KB Output is correct
7 Correct 53 ms 16468 KB Output is correct
8 Correct 39 ms 11456 KB Output is correct
9 Correct 45 ms 10748 KB Output is correct
10 Correct 50 ms 16212 KB Output is correct
11 Correct 49 ms 14576 KB Output is correct
12 Correct 30 ms 11604 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8536 KB Output is correct
2 Correct 2 ms 8672 KB Output is correct
3 Correct 10 ms 26972 KB Output is correct
4 Correct 9 ms 27188 KB Output is correct
5 Correct 10 ms 26968 KB Output is correct
6 Correct 8 ms 27224 KB Output is correct
7 Correct 9 ms 26972 KB Output is correct
8 Correct 10 ms 27180 KB Output is correct
9 Correct 8 ms 26972 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8536 KB Output is correct
2 Correct 2 ms 8672 KB Output is correct
3 Correct 10 ms 26972 KB Output is correct
4 Correct 9 ms 27188 KB Output is correct
5 Correct 10 ms 26968 KB Output is correct
6 Correct 8 ms 27224 KB Output is correct
7 Correct 9 ms 26972 KB Output is correct
8 Correct 10 ms 27180 KB Output is correct
9 Correct 8 ms 26972 KB Output is correct
10 Correct 1 ms 8792 KB Output is correct
11 Correct 2 ms 8540 KB Output is correct
12 Correct 10 ms 26968 KB Output is correct
13 Correct 9 ms 26972 KB Output is correct
14 Correct 10 ms 26972 KB Output is correct
15 Correct 8 ms 26972 KB Output is correct
16 Correct 11 ms 27184 KB Output is correct
17 Correct 9 ms 26972 KB Output is correct
18 Correct 8 ms 26972 KB Output is correct
19 Correct 246 ms 106040 KB Output is correct
20 Correct 240 ms 106188 KB Output is correct
21 Correct 230 ms 106296 KB Output is correct
22 Correct 175 ms 106172 KB Output is correct
23 Correct 208 ms 106064 KB Output is correct
24 Correct 190 ms 106064 KB Output is correct
25 Correct 192 ms 105796 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8536 KB Output is correct
2 Correct 2 ms 8672 KB Output is correct
3 Correct 10 ms 26972 KB Output is correct
4 Correct 9 ms 27188 KB Output is correct
5 Correct 10 ms 26968 KB Output is correct
6 Correct 8 ms 27224 KB Output is correct
7 Correct 9 ms 26972 KB Output is correct
8 Correct 10 ms 27180 KB Output is correct
9 Correct 8 ms 26972 KB Output is correct
10 Correct 2 ms 8540 KB Output is correct
11 Correct 1 ms 8540 KB Output is correct
12 Correct 10 ms 26972 KB Output is correct
13 Correct 9 ms 26972 KB Output is correct
14 Correct 10 ms 26972 KB Output is correct
15 Correct 9 ms 27132 KB Output is correct
16 Correct 9 ms 26968 KB Output is correct
17 Correct 9 ms 26972 KB Output is correct
18 Correct 8 ms 26972 KB Output is correct
19 Correct 190 ms 9684 KB Output is correct
20 Correct 47 ms 8920 KB Output is correct
21 Correct 43 ms 8540 KB Output is correct
22 Correct 56 ms 9284 KB Output is correct
23 Correct 41 ms 8536 KB Output is correct
24 Correct 123 ms 8540 KB Output is correct
25 Correct 15 ms 8024 KB Output is correct

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 60 ms 18260 KB Output is correct
2 Correct 57 ms 18088 KB Output is correct
3 Correct 56 ms 18160 KB Output is correct
4 Correct 45 ms 10744 KB Output is correct
5 Correct 51 ms 16100 KB Output is correct
6 Incorrect 67 ms 18284 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 8536 KB Output is correct
2 Correct 54 ms 18252 KB Output is correct
3 Correct 52 ms 18260 KB Output is correct
4 Correct 58 ms 18168 KB Output is correct
5 Correct 53 ms 17492 KB Output is correct
6 Correct 59 ms 16672 KB Output is correct
7 Correct 53 ms 16468 KB Output is correct
8 Correct 39 ms 11456 KB Output is correct
9 Correct 45 ms 10748 KB Output is correct
10 Correct 50 ms 16212 KB Output is correct
11 Correct 49 ms 14576 KB Output is correct
12 Correct 30 ms 11604 KB Output is correct
13 Correct 2 ms 8536 KB Output is correct
14 Correct 2 ms 8672 KB Output is correct
15 Correct 10 ms 26972 KB Output is correct
16 Correct 9 ms 27188 KB Output is correct
17 Correct 10 ms 26968 KB Output is correct
18 Correct 8 ms 27224 KB Output is correct
19 Correct 9 ms 26972 KB Output is correct
20 Correct 10 ms 27180 KB Output is correct
21 Correct 8 ms 26972 KB Output is correct
22 Correct 1 ms 8792 KB Output is correct
23 Correct 2 ms 8540 KB Output is correct
24 Correct 10 ms 26968 KB Output is correct
25 Correct 9 ms 26972 KB Output is correct
26 Correct 10 ms 26972 KB Output is correct
27 Correct 8 ms 26972 KB Output is correct
28 Correct 11 ms 27184 KB Output is correct
29 Correct 9 ms 26972 KB Output is correct
30 Correct 8 ms 26972 KB Output is correct
31 Correct 246 ms 106040 KB Output is correct
32 Correct 240 ms 106188 KB Output is correct
33 Correct 230 ms 106296 KB Output is correct
34 Correct 175 ms 106172 KB Output is correct
35 Correct 208 ms 106064 KB Output is correct
36 Correct 190 ms 106064 KB Output is correct
37 Correct 192 ms 105796 KB Output is correct
38 Correct 2 ms 8540 KB Output is correct
39 Correct 1 ms 8540 KB Output is correct
40 Correct 10 ms 26972 KB Output is correct
41 Correct 9 ms 26972 KB Output is correct
42 Correct 10 ms 26972 KB Output is correct
43 Correct 9 ms 27132 KB Output is correct
44 Correct 9 ms 26968 KB Output is correct
45 Correct 9 ms 26972 KB Output is correct
46 Correct 8 ms 26972 KB Output is correct
47 Correct 190 ms 9684 KB Output is correct
48 Correct 47 ms 8920 KB Output is correct
49 Correct 43 ms 8540 KB Output is correct
50 Correct 56 ms 9284 KB Output is correct
51 Correct 41 ms 8536 KB Output is correct
52 Correct 123 ms 8540 KB Output is correct
53 Correct 15 ms 8024 KB Output is correct
54 Correct 60 ms 18260 KB Output is correct
55 Correct 57 ms 18088 KB Output is correct
56 Correct 56 ms 18160 KB Output is correct
57 Correct 45 ms 10744 KB Output is correct
58 Correct 51 ms 16100 KB Output is correct
59 Incorrect 67 ms 18284 KB Output isn't correct
60 Halted 0 ms 0 KB -