Submission #209054

#	Time	Username	Problem	Language	Result	Execution time	Memory
209054		srvlt	Sails (IOI07_sails)	C++14	25 / 100	1098 ms	2148 KiB

sails

//#pragma GCC optimize("Ofast")
//#pragma GCC target("avx,avx2,fma")
#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define ull unsigned long long
#define uint unsigned int
#define db long double
#define pb push_back
#define ppb pop_back
#define fi first
#define se second
#define mp make_pair
#define all(x) (x).begin(), (x).end()

void dout() { cerr << '\n'; }

template <typename Head, typename... Tail>
void dout(Head H, Tail... T) {
    cerr << " " << H;
    dout(T...);
}

#ifdef LOCAL
    #define dbg(...) cerr << #__VA_ARGS__, dout(__VA_ARGS__)
#else
    #define dbg(...) ;
#endif

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
typedef pair <int, int> pii;

const int N = 100003, H = 100000;
int n, a[N], ind[N], used[N];
vector <pii> vec;

int main() {
    ios_base::sync_with_stdio(false), cin.tie(NULL);
    #ifdef LOCAL
        freopen("input.txt", "r", stdin);
    #endif

    cin >> n;
    int x, y;
    for (int i = 1; i <= n; i++) {
        cin >> x >> y;
        vec.pb({x, y});
        ind[i] = i;
    }
    sort(all(vec));
    int h, k;
    for (int i = 1; i <= n; i++) {
        h = vec[i - 1].fi, k = vec[i - 1].se;
        for (int j = 1; j <= h; j++) {
            used[j] = 0;
        }
        while (k--) {
            shuffle(ind + 1, ind + n + 1, rng);
            int mn = -1;
            for (int j = 1; j <= n; j++) {
                if (ind[j] > h || used[ind[j]]) {
                    continue;
                }
                if (mn == -1 || a[ind[j]] < a[mn]) {
                    mn = ind[j];
                }
            }
            a[mn]++;
            used[mn] = 1;
        }
    }
    ll ans = 0;
    for (int i = 1; i <= H; i++) {
        int x = a[i];
        ans += (ll)x * (x - 1) / 2;
    }
    cout << ans;
}

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 0 / 5
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10
• Subtask 11: 0 / 10