Submission #1338278

#	Time	Username	Problem	Language	Result	Execution time	Memory
1338278		retarde	Room Temperature (JOI24_ho_t1)	C++20	35 / 100	2 ms	768 KiB

Main

#include <bits/stdc++.h>
using namespace std;

#define pb push_back
#define pf push_front
#define mp make_pair
#define fi first
#define se second
#define int long long
#define all(x) (x).begin(), (x).end()

typedef long double ld;
typedef long long ll;
typedef pair<ll,ll> pll;
typedef pair<int,int> pii;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<bool> vb;
typedef vector<vector<int>> vvi;
typedef vector<vector<bool>> vvb;
typedef vector<vector<ll>> vvll;
typedef vector<string> vs;
typedef vector<vector<string>> vvs;
typedef vector<char> vc;
typedef vector<vector<char>> vvc;
typedef map<int, int> mii;
typedef unordered_map<int, int> umii;

const int mod = 1e9 + 7;
const int inf = INTMAX_MAX;
const bool tc = false;

bool ok(int n, int mid, int t, vi &a) {
    vector<pii> rng;
    for (int i = 0; i < n; i++) {
        if (2*mid+1 >= t) rng.pb({0, t-1});
        else {
            if (a[i] >= mid) {
                rng.pb({a[i] - mid, a[i]});
            } else {
                rng.pb({0, a[i]});
                rng.pb({t-mid-a[i], t-1});
            }

            if (a[i]+mid < t) {
                rng.pb({a[i] + 1, a[i] + mid});
            } else {
                rng.pb({a[i] + 1, t-1});
                rng.pb({0, a[i]+mid-t-1});
            }
        }
    }
    map<int, vi> event;
    for (auto &x : rng) {event[x.fi].pb(1); event[x.se].pb(-1);}

    int cur = 0;
    for (auto &x : event) {
        for (auto &y : x.se) {if (y == 1) cur += y;}
        if (cur == n) return 1;
        for (auto &y : x.se) {if (y == -1) cur += y;}
    }
    return 0;
}

inline void solve() {
    int n, t;
    cin >> n >> t;
    int ans = 0; vi a;
    for (int i = 0; i < n; i++) {
        int x; cin >> x;
        a.pb(x%t);
    }
    sort(all(a));

    int lo = -1; int hi = 1e9+5;
    while (hi > lo + 1) {
        int mid = (lo + hi) / 2;
        if (ok(n, mid, t, a)) hi = mid;
        else lo = mid;
    }
    cout << hi << '\n';
}

void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}

signed main() {
    ios::sync_with_stdio(false);
    cout.tie(0);
    cin.tie(0);
    //setIO();

    int t = 1;
    if (tc) {
        cin >> t;
    }

    while (t--) {
        solve();
    }
}

Compilation message (stderr)

Main.cpp: In function 'void setIO(std::string)':
Main.cpp:85:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   85 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:86:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   86 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 15
• Subtask 2: 5 / 5
• Subtask 3: 30 / 30
• Subtask 4: 0 / 35
• Subtask 5: 0 / 15