Submission #1097119

#	Time	Username	Problem	Language	Result	Execution time	Memory
1097119		vjudge1	Xor Sort (eJOI20_xorsort)	C++17	0 / 100	1 ms	344 KiB

xorsort

#include "bits/stdc++.h"
const signed MOD = 1e9 + 7;
const signed mod = 998244353;
using namespace std;
#define all(x) x.begin(), x.end()
#define ld long double
#define ll long long
#define pb push_back
#define mp make_pair
#define co cout <<
#define S second
#define F first
ll n, a[1000001];

bool sol(ll x) {
    ll t = x;
    vector<pair<ll, ll>> s;
    for (int i = 0; i < n * 2; i++) {
        if (a[i] <= t) {
            t += a[i];
            while (s.size() && s.back().F <= t) {
                t += s.back().S;
                s.pop_back();
            }
        }
        else {
            s.pb(mp(a[i], t - x + a[i]));
            t = x;
        }
    }
    return (s.empty());
}

void solve() {
    cin >> n;
    for (int i = 0; i < n; i++) {
        cin >> a[i];
        a[i + n] = a[i];
    }
    ll l = 0, r = 1e13;

    while (l < r) {
        ll m = l + r >> 1;
        if (sol(m)) r = m;
        else l = m + 1;
    }
    co l;
}

signed main() {
    cin.tie(0)->sync_with_stdio(0);
    signed t = 1;
    // cin >> t;
    while (t--) solve();
}

Compilation message (stderr)

xorsort.cpp: In function 'void solve()':
xorsort.cpp:43:18: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   43 |         ll m = l + r >> 1;
      |                ~~^~~

• Subtask 1: 0 / 25
• Subtask 2: 0 / 35
• Subtask 3: 0 / 40