Submission #1149996

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
1149996	2025-02-13 14:33:07	onbert	Cake 3 (JOI19_cake3)	C++20	0 / 100	166 ms	327680 KiB

cake3

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#include <bits/stdc++.h>
using namespace std;
#define int long long
const int maxn = 2e5 + 5, maxN = 8e5 + 5, INF = 1e18;
int n, m;
pair<int,int> a[maxn];
vector<int> L[maxN], R[maxN];
int ans = -INF;
void dnc(int id, int l, int r) {
    int sz = min(r - l + 1, m);
    if (l == r) {
        L[id] = {-a[l].first * 2, a[l].second - a[l].first * 2};
        R[id] = {a[l].first * 2, a[l].second + a[l].first * 2};
        // cout << l << " " << r << endl;
        // cout << L[id][0] << " " << L[id][1] << endl;
        // cout << R[id][0] << " " << R[id][1] << endl;
        return;
    }
    int mid = (l+r)/2;
    dnc(id*2, l, mid); dnc(id*2+1, mid+1, r);
    int lsz = L[id*2].size() - 1, rsz = L[id*2+1].size() - 1;
    for (int i=0;i<=m;i++) {
        if (i <= lsz && m-i <= rsz) ans = max(R[id*2][i] + L[id*2+1][m-i], ans);
        // if (i <= lsz && m-i <= rsz) cout << "wtf " << l << " " << r << " " << i << " " << R[id*2][i] << " " << L[id*2+1][m-i] << " " << R[id*2][i] + L[id*2+1][m-i] << endl;
        // if (i <= lsz && m-i <= rsz) if (R[id*2][i] + L[id*2+1][m-i] == 568584951) {
        //     cout << id << " " << l << " " << r << " " << endl;
        //     cout << i << " " << R[id*2][i] << " " << L[id*2+1][m-i] << endl;
        // }
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Compilation message (stderr)

cake3.cpp: In function 'int main()':
cake3.cpp:135:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  135 |     freopen("in.txt", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 19
• Subtask 3: 0 / 76