Submission #782869

#	Time	Username	Problem	Language	Result	Execution time	Memory
782869		RushB	LIS (INOI20_lis)	C++17	0 / 100	2392 ms	35012 KiB

Main

#include <bits/stdc++.h>
using namespace std;
#define FOR(i, a, b) for (int i = (a); i < (b); i++) 
const int64_t INF = 1ll << 60;
const int N = 1e6 + 6;
const int SQ = 1000 + 5;
const int SQQ = 2000 + 5;

int n, x[N], p[N], a[N], S, q, ans[N];
vector<int> V[SQ];
pair<int, int> bit[SQQ];

void addf(int r, pair<int, int> m) {
        for (; r < SQQ; r += r & -r) bit[r] = max(bit[r], m);
}
pair<int, int> getf(int r) {
        pair<int, int> x = {0, INF};
        for (; r; r -= r & -r) x = max(x, bit[r]);
        return x;
}

void rebuild() {
        vector<int> x;
        FOR(i, 0, SQ) {
                for (auto u: V[i]) x.push_back(u);
                V[i].clear();
        }
        for (int i = 0; i < x.size(); i++) 
                V[i / SQ].push_back(x[i]);
}
void add(vector<int> &v, int pos, int x) {
        vector<int> t;
        for (int i = 0; i < pos; i++) t.push_back(v[i]);
        t.push_back(x);
        for (int i = pos; i < v.size(); i++) t.push_back(v[i]);
        v = t;
}

void seq() {
        FOR(i, 0, q) {
                if ((i + 1) % SQ == 0) rebuild();
                int cur = p[i] - 1;
                FOR(j, 0, SQ) {
                        if (cur > V[j].size()) cur -= V[j].size();
                        else {
                                add(V[j], cur, i);
                        }
                }
        }
        int ptr = 0;
        FOR(i, 0, SQ) for (auto u: V[i]) a[ptr++] = u;
}

void solve() {
        int cnt = 0;
        while (true) {
                assert(++cnt <= 2000);
                pair<int, int> lis = {0, INF};
                fill(bit, bit + SQQ, lis);
                FOR(i, 0, q) {
                        auto p = getf(x[a[i]] - 1);
                        p.first++;
                        p.second = min(p.second, -a[i]);
                        lis = max(lis, p);
                        addf(x[a[i]], p);
                }
                for (int i = q - 1; i >= -lis.second; i--) ans[i] = lis.first;
                if (lis.second == 0) return;
                vector<int> v;
                FOR(i, 0, q) if (a[i] < -lis.second) v.push_back(a[i]);
                q = v.size();
                copy(v.begin(), v.end(), a);
        }
}

signed main() {
        ios::sync_with_stdio(0), cin.tie(0);
        cin >> q;
        int tq = q;
        vector<int> X;
        FOR(i, 0, q) {
                cin >> p[i] >> x[i];
                X.push_back(x[i]);
        }
        sort(X.begin(), X.end());
        X.resize(unique(X.begin(), X.end()) - X.begin());
        FOR(i, 0, q) {
                x[i] = lower_bound(X.begin(), X.end(), x[i]) - X.begin() + 1;
        }
        assert(X.size() <= SQQ);
        seq();
        solve();

        FOR(i, 0, tq) cout << ans[i] << '\n';
}
//12:54:46

Compilation message (stderr)

Main.cpp: In function 'void rebuild()':
Main.cpp:28:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |         for (int i = 0; i < x.size(); i++)
      |                         ~~^~~~~~~~~~
Main.cpp: In function 'void add(std::vector<int>&, int, int)':
Main.cpp:35:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |         for (int i = pos; i < v.size(); i++) t.push_back(v[i]);
      |                           ~~^~~~~~~~~~
Main.cpp: In function 'void seq()':
Main.cpp:44:33: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |                         if (cur > V[j].size()) cur -= V[j].size();
      |                             ~~~~^~~~~~~~~~~~~

• Subtask 1: 0 / 20
• Subtask 2: 0 / 80