# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
737173 | Olympia | Zoltan (COCI16_zoltan) | C++17 | 676 ms | 27904 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#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 = 20;
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];
}
}
}
return make_pair(mx, cnt);
}
void print (vector<int> v) {
cout << "{";
for (int i: v) {
cout << i << ' ';
}
cout << "}\n";
}
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);
//print(v1), print(v2);
//cout << x << " " << p1.first << " " << p1.second << " " << p2.first << " " << p2.second << '\n';
return make_pair(p1.first + p2.first, p1.second * p2.second);
}
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)
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