Submission #783018

#	Time	Username	Problem	Language	Result	Execution time	Memory
783018		RushB	LIS (INOI20_lis)	C++17	100 / 100	933 ms	50864 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], q, ans[N], mx, X[N], tmp[N], S[4 * N], delta[4 * N];
vector<int> V[N / SQ + 5];
ar M[SQQ], a[N], b[N];

void build(int v, int l, int r) {
        if (l + 1 == r) {
                S[v] = p[l];
                return;
        }
        int m = l + r >> 1;
        build(v << 1, l, m);
        build(v << 1 | 1, m, r);
        S[v] = min(S[v << 1], S[v << 1 | 1]);
}
void add(int v, int l, int r, int L, int R) {
        if (R <= l || r <= L) return;
        if (L <= l && r <= R) {
                delta[v]--;
                S[v]--;
                return;
        }
        int m = l + r >> 1;
        add(v << 1, l, m, L, R);
        add(v << 1 | 1, m, r, L, R);
        S[v] = min(S[v << 1], S[v << 1 | 1]) + delta[v];
}
int find(int v, int l, int r) {
        if (l + 1 == r) {
                S[v] = INF;
                if (l + 1 != q) add(1, 0, q, l + 1, q);
                return l;
        }
        int m = l + r >> 1, x;
        if (S[v << 1 | 1] <= S[v << 1]) x = find(v << 1 | 1, m, r);
        else x = find(v << 1, l, m);
        S[v] = min(S[v << 1], S[v << 1 | 1]) + delta[v];
        return x;
}

void seq() {
        build(1, 0, q);
        FOR(i, 0, q) {
                int t = find(1, 0, q);
                a[i][0] = t, a[i][1] = x[t];
        }
}

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';
}

Compilation message (stderr)

Main.cpp: In function 'void build(int, int, int)':
Main.cpp:19:19: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   19 |         int m = l + r >> 1;
      |                 ~~^~~
Main.cpp: In function 'void add(int, int, int, int, int)':
Main.cpp:31:19: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   31 |         int m = l + r >> 1;
      |                 ~~^~~
Main.cpp: In function 'int find(int, int, int)':
Main.cpp:42:19: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   42 |         int m = l + r >> 1, x;
      |                 ~~^~~

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