Submission #767763

#	Time	Username	Problem	Language	Result	Execution time	Memory
767763		The_Samurai	Akcija (COCI21_akcija)	C++17	30 / 110	19 ms	612 KiB

Main

#include "bits/stdc++.h"

using namespace std;
using ll = long long;
const ll inf = 1e18;

void mins(pair<int, ll> &a, pair<int, ll> b) {
    if (a.first == b.first) {
        if (a.second > b.second) {
            a = b;
        }
    } else if (a.first < b.first) {
        a = b;
    }
}

void solve() {
    int n, k;
    cin >> n >> k;
    if (k > 2) {
        cout << 0;
        return;
    }
    vector<ll> dp(n + 1, inf);
    vector<pair<int, int>> a(n);
    dp[0] = 0;
    for (int i = 0; i < n; i++) {
        cin >> a[i].second >> a[i].first;
    }
    sort(a.begin(), a.end());
    for (int i = 0; i < n; i++) {
        auto [d, w] = a[i];
        for (int j = d - 1; j >= 0; j--) {
            dp[j + 1] = min(dp[j + 1], dp[j] + w);
        }
    }
    int ans_pos;
    for (int i = n; i > 0; i--) {
        if (dp[i] != inf) {
            ans_pos = i;
            cout << i << ' ' << dp[i] << '\n';
            break;
        }
    }
    if (k == 1) {
        return;
    }
    vector<int> pos;
    vector<bool> vis(n);
    {
        for (int i = ans_pos; i > 0; i--) {
            for (int j = n - 1; j >= 0; j--) {
                if (!vis[j] and a[j].first >= i and dp[i - 1] + a[j].second == dp[i]) {
                    vis[j] = true;
                    pos.emplace_back(j);
                    break;
                }
            }
        }
    }
    reverse(pos.begin(), pos.end());
    pair<int, ll> best = {0, 0};
    for (int i = 0; i < ans_pos; i++) {
        int x = pos[i];
        pos.erase(pos.begin() + i);
        vector<bool> suff(pos.size() + 1, true);
        for (int j = (int) pos.size() - 1; j >= 0; j--) {
            suff[j] = suff[j + 1] & (a[pos[j]].first > j + 1);
        }
        mins(best, make_pair(ans_pos - 1, dp[ans_pos] - a[x].second));
        for (int j = 0; j < n; j++) {
            if (vis[j]) {
                continue;
            }
            int l = lower_bound(pos.begin(), pos.end(), j) - pos.begin();
            if (a[j].first >= l + 1 and suff[l]) {
                mins(best, make_pair(ans_pos, dp[ans_pos] - a[x].second + a[j].second));
            }
        }
        pos.insert(pos.begin() + i, x);
    }
    cout << best.first << ' ' << best.second;
}

int main() {
    ios_base::sync_with_stdio(false);
    cout.tie(nullptr);
    cin.tie(nullptr);
    srand(time(0));

    int queries = 1;
#ifdef test_cases
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
    cin >> queries;
#else
    //    cin >> queries;
#endif

    for (int test_case = 1; test_case <= queries; test_case++) {
#ifdef test_cases
        cout << "Test case: " << test_case << endl;
#endif
        solve();
        cout << '\n';
    }
}

Compilation message (stderr)

Main.cpp: In function 'void solve()':
Main.cpp:12:12: warning: 'ans_pos' may be used uninitialized in this function [-Wmaybe-uninitialized]
   12 |     } else if (a.first < b.first) {
      |            ^~
Main.cpp:37:9: note: 'ans_pos' was declared here
   37 |     int ans_pos;
      |         ^~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 10
• Subtask 5: 0 / 30
• Subtask 6: 0 / 20