Submission #531431

#	Time	Username	Problem	Language	Result	Execution time	Memory
531431		dxz05	Collecting Stamps 3 (JOI20_ho_t3)	C++14	0 / 100	1 ms	204 KiB

ho_t3

//#pragma GCC optimize("Ofast,O2,O3,unroll-loops")
//#pragma GCC target("avx2")

#include <bits/stdc++.h>

using namespace std;

void debug_out() { cerr << endl; }

template<typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
    cerr << "[" << H << "]";
    debug_out(T...);
}

#ifdef dddxxz
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
#define debug(...) 42
#endif

#define SZ(s) ((int)s.size())
#define all(x) (x).begin(), (x).end()
#define lla(x) (x).rbegin(), (x).rend()
#define bpc(x) __builtin_popcount(x)
#define bpcll(x) __builtin_popcountll(x)

clock_t startTime;

double getCurrentTime() {
    return (double) (clock() - startTime) / CLOCKS_PER_SEC;
}

#define MP make_pair

typedef long long ll;
mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
const double eps = 0.000001;
const int MOD = 998244353;
const int INF = 1000000101;
const long long LLINF = 1223372000000000555;
const int N = 1e6 + 3e2;
const int M = 1222;

int answer(int l, vector<int> x, vector<int> t){
    int n = x.size();

    int res = 0;

    int cnt = 0;
    for (int i = 0; i < n; i++){
        cnt += x[i] <= t[i];
        res = max(res, cnt);

        int cur = cnt;
        for (int j = n - 1; j > i; j--){
            cur += 1ll * x[i] * 2 + l - x[j] <= t[j];
            res = max(res, cur);
        }
    }

    return res;
}

void solve(int TC) {
    int n, l;
    cin >> n >> l;

    vector<int> x(n), t(n);
    for (int &i : x) cin >> i;
    for (int &i : t) cin >> i;

    int ans = answer(l, x, t);

    for (int &i : x) i = l - i;
    reverse(all(x));
    reverse(all(t));

    ans = max(ans, answer(l, x, t));

    cout << ans << endl;

}

int main() {
    startTime = clock();
    ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);

#ifdef dddxxz
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif

    int TC = 1;
//    cin >> TC;

    for (int test = 1; test <= TC; test++) {
        //debug(test);
        //cout << "Case #" << test << ": ";
        solve(test);
    }

//    cerr << endl << "Time: " << int(getCurrentTime() * 1000) << " ms" << endl;

    return 0;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 75