Submission #999661

#	Time	Username	Problem	Language	Result	Execution time	Memory
999661		roadster	Rabbit Carrot (LMIO19_triusis)	C++17	100 / 100	20 ms	4808 KiB

triusis

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

using vi = vector<int>;
using vvi = vector<vector<int> >;
using pi = pair<int, int>;
using ll = long long;

#define sz(x) (int)(x).size()
#define all(x) (x).begin(), (x).end()
#define f first
#define s second
#define pb push_back

const ll MOD = 1e9 + 7;
ll expo(ll x, ll n) {
    ll res = 1LL;
    while (n) {
           if (n % 2){ res = res * x % MOD; }
        x = x * x % MOD;
        n /= 2;
    }
    return res;
}

vector<ll> factorial(int n) {
    vector<ll> fact(n + 1);
    fact[0] = 1;
    for (int i = 1; i <= n; i++) { fact[i] = fact[i - 1] * i % MOD; }
    return fact;
}

vector<ll> mod_inverse(int n, ll fact_n) {
    vector<ll> inv(n + 1);
    inv[n] = expo(fact_n, MOD - 2);
    for (int i = n; i >= 1; i--) {
        inv[i - 1] = inv[i] * i % MOD;
    }
    return inv;
}

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

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    // your code goes here
    int n, m;
    cin >> n >> m;

    vi poles(n);
    for (int &i: poles) cin >> i;

    vi unchanged;
    for (int i = 1; i <= n; i++) {
        if (i * m >= poles[i-1]) {
            unchanged.pb(i * m - poles[i-1]);
        }
    }

    vi dp;
    for (int i: unchanged) {
        int pos = upper_bound(all(dp), i) - dp.begin();
        if (pos == sz(dp)) {
            dp.pb(i);
        } else {
            dp[pos] = i;
        }
    }

    cout << n - sz(dp) << "\n";
    return 0;
}

Compilation message (stderr)

triusis.cpp: In function 'void setIO(std::string)':
triusis.cpp:43:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   43 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
triusis.cpp:44:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   44 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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