Submission #1060434

#	Time	Username	Problem	Language	Result	Execution time	Memory
1060434		manhlinh1501	Rabbit Carrot (LMIO19_triusis)	C++17	100 / 100	49 ms	5596 KiB

triusis

#include <bits/stdc++.h>
using namespace std;
using i64 = long long;
const int MAXN = 2e5 + 5;
#define ALL(a) (a).begin(), (a).end()
#define LB(a, x) (lower_bound(ALL(a), x) - (a).begin() + 1)
struct fenwick {
    int tree[MAXN];

    void update(int x, int v) {
        x++;
        for(; x < MAXN; x += (x & -x))
            tree[x] = max(tree[x], v);
    }

    int calc(int x) {
        x++;
        int res = 0;
        for(; x; x -= (x & -x))
            res = max(res, tree[x]);
        return res;
    }
} BIT;
int N, K;
int a[MAXN];
int b[MAXN];

void compress() {
    vector<int> temp;
    for(int i = 1; i <= N; i++) temp.emplace_back(a[i]);
    sort(ALL(temp));
    temp.resize(unique(ALL(temp)) - temp.begin());
    for(int i = 1; i <= N; i++) a[i] = LB(temp, a[i]);
}

signed main() {
#define TASK "code"

    if (fopen(TASK ".inp", "r")) {
        freopen(TASK ".inp", "r", stdin);
        freopen(TASK ".out", "w", stdout);
    }

    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    cin >> N >> K;
    for(int i = 1; i <= N; i++) {
        cin >> b[i];
        a[i] = i * K - b[i];
        b[i] = a[i];
    }
    compress();
    int ans = 0;
    for(int i = 1; i <= N; i++) {
        if(b[i] >= 0) {
            int res = BIT.calc(a[i]) + 1;
            ans = max(ans, res);
            BIT.update(a[i], res);
        }
    }
    cout << N - ans;
    return (0 ^ 0);
}

Compilation message (stderr)

triusis.cpp: In function 'int main()':
triusis.cpp:40:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   40 |         freopen(TASK ".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
triusis.cpp:41:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   41 |         freopen(TASK ".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

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