Submission #701436

#	Time	Username	Problem	Language	Result	Execution time	Memory
701436		tamthegod	Lightning Conductor (POI11_pio)	C++17	81 / 100	1046 ms	48812 KiB

pio

// Make the best become better
// No room for laziness
#include<bits/stdc++.h>


#define pb push_back
#define fi first
#define se second
using namespace std;
using ll = long long;
using ld = long double;
using ull = unsigned long long;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const int maxN = 5e5 + 5;
const int mod = 1e9 + 7;
const ll oo = 1e18;
int n;
int a[maxN];
int f[21][maxN];
int lg[maxN];
int ans[maxN];
void SparseTable()
{
    for(int i=1; i<=n; i++)
        f[0][i] = a[i];
    for(int k=1; k<=lg[n]; k++)
        for(int i=1; i<=n; i++)
        {
            int j = i + (1 << (k - 1));
            if(j > n) f[k][i] = f[k - 1][i];
            else f[k][i] = max(f[k - 1][i], f[k - 1][j]);
        }
}
inline int get(int l, int r)
{
    int k = lg[r - l + 1];
    return max(f[k][l], f[k][r - (1 << k) + 1]);
}
void ReadInput()
{
    cin >> n;
    for(int i=1; i<=n; i++)
        cin >> a[i];
    for(int i=2; i<maxN; i++)
        lg[i] = lg[i / 2] + 1;
}
void Solve()
{
    SparseTable();
    for(int i=1; i<=n; i++)
    {
        int res = ans[i - 1] + a[i - 1] - a[i] - 1;
        int len = (int)sqrt(i - 2) + 1;
        while(len >= 1)
        {
            int r = i - (len - 1) * (len - 1) - 1;
            int l = i - len * len;
            l = max(1, l);
            if(a[i] + res - len >= get(l, i - 1)) break;
            res = max(res, get(l, r) + len - a[i]);
            len--;
        }
        len = (int)sqrt(n - i - 1) + 1;
        while(len >= 1)
        {
            int l = i + (len - 1) * (len - 1) + 1;
            int r = i + len * len;
            r = min(r, n);
            if(a[i] + res - len >= get(i + 1, r)) break;
            res = max(res, get(l, r) + len - a[i]);
            len--;
        }
        cout << (ans[i] = res) << '\n';
    }
}
int32_t main()
{
    //freopen("sol.inp", "r", stdin);
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    ReadInput();
    Solve();
}

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