Submission #660547

#	Time	Username	Problem	Language	Result	Execution time	Memory
660547		hafo	Rabbit Carrot (LMIO19_triusis)	C++14	100 / 100	55 ms	5504 KiB

triusis

#include <bits/stdc++.h>
#define ll long long
#define ull unsigned ll
#define pb push_back
#define pa pair<int, int>
#define pall pair<ll, int>
#define fi first
#define se second
#define TASK "test"
#define all(x) x.begin(), x.end()
using namespace std;

template<typename T1, typename T2> bool mini (T1 &a, T2 b) {if(a > b) a = b; else return 0; return 1;}
template<typename T1, typename T2> bool maxi (T1 &a, T2 b) {if(a < b) a = b; else return 0; return 1;}

const int MOD = 1e9 + 7;
const int LOG = 20;
const int maxn = 2e5 + 7;
const int oo = 1e9 + 69;

int n, m, a[maxn], dp[maxn], b[maxn];

struct BIT {
    int bit[maxn];

    void update(int x, int val) {
        for(; x <= n; x += x & -x) maxi(bit[x], val);
    }

    int get(int x) {
        int ans = 0;
        for(; x; x -= x & -x) maxi(ans, bit[x]);
        return ans;
    }
} bit;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    //freopen(TASK".inp", "r", stdin);
    //freopen(TASK".out", "w", stdout);

    cin>>n>>m;
    vector<int> com;
    for(int i = 1; i <= n; i++) {
        cin>>a[i];
        b[i] = 1LL * m * i - a[i];
        com.pb(b[i]);
    }

    int ans = 0, pos;
    sort(all(com));
    for(int i = 1; i <= n; i++)
        if(b[i] >= 0) {
            pos = lower_bound(all(com), b[i]) - com.begin() + 1;
            maxi(dp[i], bit.get(pos) + 1);
            bit.update(pos, dp[i]);
            maxi(ans, dp[i]);
        }
    cout<<n - ans;
    return 0;
}

• Subtask 1: 14 / 14
• Subtask 2: 21 / 21
• Subtask 3: 28 / 28
• Subtask 4: 37 / 37