Submission #783003

#	Time	Username	Problem	Language	Result	Execution time	Memory
783003		RushB	LIS (INOI20_lis)	C++17	20 / 100	4056 ms	6916 KiB

Main

#include <bits/stdc++.h>
using namespace std;
#define FOR(i, a, b) for (int i = (a); i < (b); i++) 
using ar = array<int, 2>;
const int INF = 1ll << 30;
const int N = 1e6 + 6;
const int SQ = 3000;
const int SQQ = 2000 + 5;

int n, x[N], p[N], S, q, ans[N], mx, X[N], tmp[N];
vector<int> V[N / SQ + 5];
ar M[SQQ], a[N], b[N];

void rebuild() {
        int ptr = 0;
        for (int i = 0; V[i].size(); i++) {
                for (auto u: V[i]) tmp[ptr++] = u;
                V[i].clear();
        }
        mx = 0;
        FOR(i, 0, ptr) {
                V[i >> 11].push_back(tmp[i]);
                mx = max(mx, (int) V[i >> 11].size());
        }
}
inline void add(vector<int> &v, int pos, int x) {
        if (pos == v.size()) {
                v.push_back(x);
                return;
        }
        v.insert(v.begin() + pos, x);
        mx = max(mx, (int) v.size());
}

void seq() {
        FOR(i, 0, q) {
                if (mx >= (1 << 11)) rebuild();
                int cur = p[i] - 1;
                for (int j = 0; j <= i; j++) {
                        if (cur > V[j].size()) cur -= V[j].size();
                        else {
                                add(V[j], cur, i);
                                break;
                        }
                }
        }
        int ptr = 0;
        for (int i = 0; V[i].size(); i++) for (auto u: V[i]) a[ptr][0] = u, a[ptr][1] = x[u], ptr++;
}

void solve() {
        while (true) {
                ar lis = {0, INF};
                fill(M, M + SQQ, lis);
                FOR(i, 0, q) {
                        ar p = *max_element(M, M + a[i][1]);
                        p[0]++, p[1] = min(p[1], -a[i][0]);
                        M[a[i][1]] = max(M[a[i][1]], p);
                }
                lis = *max_element(M, M + SQQ);
                for (int i = q - 1; i >= -lis[1]; i--) ans[i] = lis[0];
                if (!lis[1]) return;
                int ptr = 0;
                FOR(i, 0, q) if (a[i][0] < -lis[1]) b[ptr++] = a[i];
                q = ptr;
                copy(b, b + ptr, 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 add(std::vector<int>&, int, int)':
Main.cpp:27:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |         if (pos == v.size()) {
      |             ~~~~^~~~~~~~~~~
Main.cpp: In function 'void seq()':
Main.cpp:40:33: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |                         if (cur > V[j].size()) cur -= V[j].size();
      |                             ~~~~^~~~~~~~~~~~~

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