Submission #737176

#	Time	Username	Problem	Language	Result	Execution time	Memory
737176		Olympia	Zoltan (COCI16_zoltan)	C++17	63 / 140	1089 ms	13388 KiB

zoltan

#include <iostream>
#include <set>
#include <cmath>
#include <queue>
#include <vector>
#include <cstdlib>
#include <ctime>
#include <cmath>
#include <algorithm>
#include <cassert>
#include <map>
#include <deque>
using namespace std;
const int MX = 2e5;
int64_t lis_length[MX];
int64_t lis_number[MX];
const int MOD = 1e9 + 7;
pair<int64_t,int64_t> lis (vector<int> v, int x) {
    lis_length[0] = 1, lis_number[0] = 1;
    for (int i = 1; i < v.size(); i++) {
        lis_length[i] = 1, lis_number[i] = 1;
        for (int j = 0; j < i; j++) {
            if (v[j] < v[i]) {
                if (lis_length[j] + 1 > lis_length[i]) {
                    lis_length[i] = lis_length[j] + 1;
                    lis_number[i] = lis_number[j];
                } else if (lis_length[j] + 1 == lis_length[i]) {
                    lis_number[i] += lis_number[j];
                    lis_number[i] %= MOD;
                }
            }
        }
    }
    int64_t mx = 0, cnt = 1;
    for (int i = 0; i < v.size(); i++) {
        if (v[i] == x or x == -1) {
            if (lis_length[i] > mx) {
                mx = lis_length[i];
                cnt = lis_number[i];
            } else if (lis_length[i] == mx) {
                cnt += lis_number[i];
                cnt %= MOD;
            }
        }
    }
    return make_pair(mx, cnt);
}
pair<int64_t,int64_t> split (vector<int> v, int x) {
    vector<int> v1, v2;
    for (int i: v) {
        if (i > x) {
            v2.push_back(i);
        } else {
            v1.push_back(i);
        }
    }
    reverse(v1.begin(), v1.end());
    auto p1 = lis(v1, x);
    auto p2 = lis(v2, -1);
    return make_pair(p1.first + p2.first, (p1.second * p2.second) % MOD);
}
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int n;
    cin >> n;
    vector<int> v(n);
    set<int> s;
    s.insert(0);
    for (int i = 0; i < n; i++) {
        cin >> v[i];
        s.insert(v[i]);
    }
    int64_t mx = 0, cnt = 0;
    for (int i: s) {
        auto p = split(v, i);
        if (p.first > mx) {
            mx = p.first, cnt = p.second;
        } else if (p.first == mx) {
            cnt += p.second, cnt %= MOD;
        }
    }
    if (cnt % 2 == 0) cnt /= 2;
    else cnt = (cnt + MOD - 1)/2 % MOD;   
    for (int i = 0; i < n - mx; i++) {
        cnt *= 2; cnt %= MOD;
    }
    cout << mx << " " << cnt << '\n';
}

Compilation message (stderr)

zoltan.cpp: In function 'std::pair<long int, long int> lis(std::vector<int>, int)':
zoltan.cpp:20:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 |     for (int i = 1; i < v.size(); i++) {
      |                     ~~^~~~~~~~~~
zoltan.cpp:35:23: 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 = 0; i < v.size(); i++) {
      |                     ~~^~~~~~~~~~

• Subtask 1: 63 / 140