Submission #1297104

#	Time	Username	Problem	Language	Result	Execution time	Memory
1297104		MisterReaper	Peru (RMI20_peru)	C++20	0 / 100	66 ms	78976 KiB

peru

#include "peru.h"
#include "bits/stdc++.h"

namespace {
    #ifdef DEBUG 
        #include "/home/ahmetalp/Desktop/Workplace/debug.h"
    #else
        #define debug(...) void(23)
    #endif

    using i64 = long long;

    constexpr i64 inf = i64(1E18);
    constexpr int md = int(1E9) + 7;

    #define def int mid = (l + r) >> 1, lv = v + 1, rv = v + ((mid - l + 1) << 1)
    struct segtree {
        int n;
        std::vector<i64> tree;
        segtree(int n_) : n(n_), tree(n << 1, inf) {}
        void set(int v, int l, int r, int p, i64 x) {
            if (l == r) {
                tree[v] = x;
                return;
            }
            def;
            if (p <= mid) {
                set(lv, l, mid, p, x);
            } else {
                set(rv, mid + 1, r, p, x);
            }
            tree[v] = std::min(tree[lv], tree[rv]);
        }
        void set(int p, i64 x) {
            set(0, 0, n - 1, p, x);
        }
        i64 get(int v, int l, int r, int ql, int qr) {
            if (ql == l && r == qr) {
                return tree[v];
            }
            def;
            if (qr <= mid) {
                return get(lv, l, mid, ql, qr);
            } else if (mid + 1 <= ql) {
                return get(rv, mid + 1, r, ql, qr);
            } else {
                return std::min(get(lv, l, mid, ql, mid), get(rv, mid + 1, r, mid + 1, qr));
            }
        }
        i64 get(int l, int r) {
            return get(0, 0, n - 1, l, r);
        }
    };
};

int solve(int N, int K, int* A){
    std::vector<i64> f(N + 1, inf);
    f[0] = 0;
    // segtree seg(N + 1);
    // seg.set(0, 0);
    // std::vector<int> stk {-1};
    std::vector<int> stk;
    std::vector<int> prv(N);
    for (int i = 0; i < N; ++i) {
        while (!stk.empty() && A[stk.back()] <= A[i]) {
            stk.pop_back();
        }
        prv[i] = stk.empty() ? -1 : stk.back();
        stk.emplace_back(i);
    }
    debug(prv);

    std::deque<int> deq;
    segtree seg(N);
    std::set<i64> mset {inf};
    for (int i = 1; i <= N; ++i) {
        debug(i, deq, mset);
        if (deq.front() == i - K - 1) {
            int x = deq.front();
            if (prv[x] <= i - K) {
                mset.erase(mset.find(A[x]));
            } else {
                seg.set(x, inf);
            }
            deq.pop_front();
        }
        debug(__LINE__);
        while (!deq.empty() && A[deq.back()] <= A[i - 1]) {
            int x = deq.back();
            debug(x, prv[x]);
            if (prv[x] < i - K) {
                mset.erase(mset.find(A[x]));
            } else {
                seg.set(x, inf);
            }
            deq.pop_back();
        }
        debug(__LINE__);
        if (!deq.empty() && prv[deq.front()] + 1 == i - K) {
            seg.set(deq.front(), inf);
            mset.emplace(A[deq.front()]);
        }
        auto eval = [&](int x) -> i64 {
            return f[std::max(prv[x] + 1, i - K)] + A[x];
        };
        debug(__LINE__);
        int x = i - 1;
        if (prv[x] + 1 <= i - K) {
            mset.emplace(A[x]);
        } else {
            seg.set(x, eval(i - 1));
        }
        deq.emplace_back(i - 1);
        debug(__LINE__);
        debug(i, deq, mset);
        f[i] = seg.get(0, N - 1);
        f[i] = std::min(f[i], *mset.begin() + f[std::max(0, i - K)]);
        // for (auto j : deq) {
        //     debug(j, eval(j));
        //     f[i] = std::min(f[i], eval(j));
        // }
        #ifdef LOCAL
            int mx = 0;
            i64 real = inf;
            for (int j = i; j >= std::max(1, i - K + 1); --j) {
                mx = std::max(mx, A[j - 1]);
                real = std::min(real, f[j - 1] + mx);
            }
            mx = 0;
            for (int j = i; j >= std::max(1, i - K + 1); --j) {
                mx = std::max(mx, A[j - 1]);
                real = std::min(real, f[j - 1] + mx);
                if (real == f[j - 1] + mx) {
                    debug(i, j - 1);
                }
            }
            debug(real, f[i]);
            assert(real == f[i]);
        #endif
    }

    int ans = 0;
    for (int i = 0; i < N; ++i) {
        int x = f[i + 1] % md;
        debug(i, x);
        ans = (ans * 23LL + x) % md;
    }

    return ans;
}

• Subtask 1: 0 / 18
• Subtask 2: 0 / 31
• Subtask 3: 0 / 51