Submission #1139948

#	Time	Username	Problem	Language	Result	Execution time	Memory
1139948		jackofall718	Fish 3 (JOI24_fish3)	C++20	0 / 100	508 ms	1114112 KiB

Main

#include <bits/stdc++.h>
#include <chrono>
#define ll long long int
#define endl '\n'
#define vn vector<ll>
#define vi vector<pair <ll,ll>>

using namespace std;
using namespace std::chrono;
const int MAX_N = 1e9 + 7;
#define pii pair<ll,ll>
const ll INF = 0x3f3f3f3f3f3f3f3f;

#define pb push_back  
#define srt(vp) sort(vp.begin(), vp.end()) 

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    auto start = high_resolution_clock::now();
    ll n,p,q;
    cin >> n >> p >> q;
    vn v(n);
    for (auto &x : v) cin >> x;
    sort(v.begin(), v.end());
    ll lo = 1;
    ll ho = 1e9; // Modified to set upper bound correctly
    while (lo < ho){ // Modified to ensure exit condition
        ll mid = (lo + ho) / 2;
        ll dp[p+1][q+1] = {}; // Added initialization
        bool check = false;
        for (ll i = 0; i <= p; i++){
            for (ll j = 0; j <= q; j++){
                ll x = i > 0 ? dp[i-1][j] : -1; // Initialize x and conditionally set
                ll y = j > 0 ? dp[i][j-1] : -1; // Initialize y and conditionally set
                if (x < n-1 && i > 0){ // Fixed boundary check
                    ll newdist = upper_bound(v.begin(), v.end(), v[x] + mid) - v.begin() - 1;
                    dp[i][j] = max(dp[i][j], newdist);
                }
                if (y < n-1 && j > 0){ // Fixed boundary check
                    ll newdist1 = upper_bound(v.begin(), v.end(), v[y] + 2 * mid) - v.begin() - 1; // Doubled the range for large camera
                    dp[i][j] = max(dp[i][j], newdist1);
                }
                if (dp[i][j] >= n-1){ // Fixed comparison to the last index
                    check = true;
                }
            }
        }
        if (check) ho = mid; // Fixed the binary search update condition
        else lo = mid + 1; // Ensure progress in the loop
    }

    auto stop = high_resolution_clock::now();
    auto duration = duration_cast<microseconds>(stop - start);
    cout << "Time taken by function: " << duration.count() << " microseconds" << endl; // Un-commented for utility

    //cout << lo << endl; // This line outputs the result
    return 0;
}

• Subtask 1: 0 / 9
• Subtask 2: 0 / 7
• Subtask 3: 0 / 28
• Subtask 4: 0 / 20
• Subtask 5: 0 / 36