oj.uz

답안 #792432

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
792432 2023-07-25T04:48:14 Z 이동현(#10054) Binaria (CCO23_day1problem1) C++17
0 / 25
 9 ms 23776 KB 
#include <bits/stdc++.h>
#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#define int long long
using namespace std;

const int NS = (int)1e6 + 4, mod = (int)1e6 + 3;
int n, k;
int a[NS];
int r[NS], l[NS], chk[NS];

int pw(int x, int y){
    if(!y) return 1;
    if(y == 1) return x;
    int v = pw(x, y / 2);
    return v * v % mod * (y % 2 ? x : 1) % mod;
}

int fdr(int x){
    return (x == r[x] ? x : r[x] = fdr(r[x]));
}

int fdl(int x){
    return (x == l[x] || x == -1 ? x : l[x] = fdl(l[x]));
}

struct Fenwick{
    int n;
    vector<int> tr;
    Fenwick(int m){
        n = m + 4;
        tr.resize(n);
    }

    void push(int pos, int val){
        pos += 2;
        for(int i = pos; i < n; i += (i & -i)){
            tr[i] += val;
        }
    }

    int get(int pos){
        int rv = 0;
        pos += 2;
        for(int i = pos; i > 0; i -= (i & -i)){
            rv += tr[i];
        }

        return rv;
    }

    int get(int l, int r){
        return get(r) - get(l - 1);
    }
};

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);

    iota(r, r + NS, 0);
    iota(l, l + NS, 0);
    memset(chk, -1, sizeof(chk));

    int n, k;
    cin >> n >> k;
    vector<int> a(n - k + 1);
    for(int i = 0; i < n - k + 1; ++i){
        cin >> a[i];
    }
    Fenwick tr(n);

    auto cant = [&]{
        cout << "0\n";
        exit(0);
    };

    auto nor = [&](vector<int> x)->vector<int>{
        int nl = fdr(x[0]);
        int nr = fdl(x[1]);
        if(nl > nr){
            int nv = x[2] - tr.get(x[0], x[1]);
            if(nv) cant();
            return {nl, nr, 0};
        }
        int nv = x[2] - tr.get(x[0], nl - 1) - tr.get(nr + 1, x[1]);
        return {nl, nr, nv};
    };

    auto upd = [&](int pos, int val){
        if(val < 0 || val > 1) cant();
        chk[pos] = val;
        l[pos] = pos - 1;
        r[pos] = pos + 1;
    };

    vector<vector<int>> stk;
    stk.push_back({0, k - 1, a[0]});
    for(int i = 1; i < n - k + 1; ++i){
        vector<int> now = nor({i, i + k - 1, a[i]});
        if(!(int)stk.size()){
            upd(now[1], now[2]);
            continue;
        }
        while((int)stk.size() && now[0] <= now[1]){
            stk.back() = nor(stk.back());
            if(stk.back()[0] > stk.back()[1]){
                stk.pop_back();
                continue;
            }

            // cout << i << ' ' << stk.back()[0] << ' ' << stk.back()[1] << ' ' << now[0] << ' ' << now[1] << endl;
            assert(stk.back()[0] < now[0] && stk.back()[1] < now[1]);
            if(stk.back()[2] == now[2]) break;
            if(stk.back()[2] > now[2]){
                upd(stk.back()[0], stk.back()[2] - now[2]);
                upd(now[1], 0);
            }
            else{
                upd(now[1], now[2] - stk.back()[2]);
                upd(stk.back()[0], 0);
            }
            stk.pop_back();

            now = nor(now);

        }

        if((int)stk.size()){
            stk.push_back(now);
        }
    }

    if(!(int)stk.size()){
        cout << "1\n";
    }

    int ac = 0, oc = a[0];
    for(int i = 0; i < k; ++i){
        ac += (chk[i] == -1);
        oc -= (chk[i] == 1);
    }

    int ans = 1;
    for(int i = oc + 1; i <= ac; ++i){
        (ans *= i) %= mod;
    }
    for(int i = 2; i <= ac - oc; ++i){
        (ans *= pw(i, mod - 2)) %= mod;
    }

    cout << ans << '\n';
    
    return 0;
}

Subtask #1
0 / 3.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 23764 KB Output is correct
2 Correct 9 ms 23776 KB Output is correct
3 Incorrect 9 ms 23764 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #2
0 / 3.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 23764 KB Output is correct
2 Correct 9 ms 23776 KB Output is correct
3 Incorrect 9 ms 23764 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #3
0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 23764 KB Output is correct
2 Correct 9 ms 23776 KB Output is correct
3 Incorrect 9 ms 23764 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #4
0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 23764 KB Output is correct
2 Correct 9 ms 23776 KB Output is correct
3 Incorrect 9 ms 23764 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #5
0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 23764 KB Output is correct
2 Correct 9 ms 23776 KB Output is correct
3 Incorrect 9 ms 23764 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #6
0 / 7.0

# 결과 실행 시간 메모리 Grader output
1 Correct 9 ms 23764 KB Output is correct
2 Correct 9 ms 23776 KB Output is correct
3 Incorrect 9 ms 23764 KB Output isn't correct
4 Halted 0 ms 0 KB -