Submission #1267822

#	Time	Username	Problem	Language	Result	Execution time	Memory
1267822		minhmc2019	Rabbit Carrot (LMIO19_triusis)	C++20	14 / 100	625 ms	472 KiB

triusis

#include <bits/stdc++.h>
#define FOR(i, l, r, x) for(int i = l; i <= r; i += x)
#define FOD(i, l, r, x) for(int i = l; i >= r; i -= x)
#define debug(x) cout << "[DEBUG]:  " << #x << " = " << x << endl;
#define BIT(x) (1 << (x))
#define int long long
using namespace std;

const int N = 2e5 + 5;
const int mod = 1e9 + 7;
const int inf = 1e18;

int n, M, h[N];

inline bool isOn(int mask, int i) {
    return ((mask >> i) & 1LL);
}

void solve() {
    cin >> n >> M;
    FOR(i, 1, n, 1) cin >> h[i];
    h[0] = 0;

    int ans = 0;

    FOR(mask, 0, BIT(n) - 1, 1) {
        int last_i = -1;
        bool isValid = true;
//
//        debug(bitset<5>(mask));

        FOR(i, 0, n - 1, 1) {
            if (!isOn(mask, i)) continue;

//            if (last_i == -1) {
//                last_i = i;
//                continue;
//            }

            bool can_move = (h[last_i + 1] + ((i - last_i) * M) >= h[i + 1]);

            if (!can_move) {
//                cout << "index: " << last_i << " " << i << endl;
//                cout << "height: " << h[last_i + 1] << " " << ((i - last_i) * M) << " " << h[i + 1] << endl << endl;
                isValid = false;
                break;
            }

            last_i = i;
        }

        if (isValid) {
            ans = max(ans, (int)__builtin_popcountll(mask));
        }
    }

    cout << n - ans << endl;
}

signed main() {
    #define name "task"
    if (ifstream(name".inp")) {
        freopen(name".inp", "r", stdin);
        freopen(name".out", "w", stdout);
    }

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

    solve();
}

Compilation message (stderr)

triusis.cpp: In function 'int main()':
triusis.cpp:63:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   63 |         freopen(name".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
triusis.cpp:64:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   64 |         freopen(name".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 14 / 14
• Subtask 2: 0 / 21
• Subtask 3: 0 / 28
• Subtask 4: 0 / 37