Submission #892394

#	Time	Username	Problem	Language	Result	Execution time	Memory
892394		Peter2017	Financial Report (JOI21_financial)	C++14	100 / 100	415 ms	28684 KiB

Main

#include <bits/stdc++.h>
#define fi first
#define se second
#define ll long long
#define pii pair<int,int>
#define pll pair<ll,ll>
#define pill pair<int,ll>
#define mem(a, b) memset(a, b, sizeof(a))
#define MASK(i) (1LL << (i))
#define BIT(x, i) (((x) >> (i)) & 1)
#define name "test"

using namespace std;

const int N = 3e5 + 5;
const int mod = 1e9 + 7;
const ll oo = 1e18 + 69;

template <typename T1, typename T2> bool maxi(T1 &a, T2 b){if (a < b){a = b; return 1;} return 0;}
template <typename T1, typename T2> bool mini(T1 &a, T2 b){if (a > b){a = b; return 1;} return 0;}

int n;
int k;
int D;
int a[N];
int f[(int)7e3 + 2][(int)7e3 + 2];
deque <int> dq[(int)7e3 + 2];
vector <int> value;

void load(){
    cin.tie(0)->sync_with_stdio(0);
    if (fopen(name".inp", "r")){
        freopen(name".inp", "r", stdin);
        freopen(name".out", "w", stdout);
    }
}

void input(){
    cin >> n >> D;
    for (int i = 1; i <= n; i++){
        cin >> a[i];
    }
}

void compress(){
    for (int i = 1; i <= n; i++)
        value.push_back(a[i]);
    sort(value.begin(), value.end());
    value.erase(unique(value.begin(), value.end()), value.end());
    for (int i = 1; i <= n; i++)
        a[i] = lower_bound(value.begin(), value.end(), a[i]) - value.begin() + 1;
    k = (int)value.size();
}

namespace subtask3{
    void solve(){
        mem(f, -0x3f);
        for (int i = 1; i <= n; i++){
            f[i][a[i]] = 1;
            for (int j = 1; j <= k; j++){
                if (dq[j].size() && dq[j].front() < i - D) dq[j].pop_front();
                if (dq[j].size()) maxi(f[i][max(a[i], j)], f[dq[j].front()][j] + (j < a[i]));
            }
            for (int j = 1; j <= k; j++){
                while (dq[j].size() && f[dq[j].back()][j] <= f[i][j])
                    dq[j].pop_back();
                dq[j].push_back(i);
            }
        }
        int ans = 0;
        for (int i = 1; i <= k; i++)
            maxi(ans, f[n][i]);
        cout << ans;
    }
}

namespace subtask4{
    stack <int> st;
    void solve(){
        st.push(n);
        int ans = 1;
        for (int i = n - 1; i >= 1; i--){
            while (st.size() && a[st.top()] <= a[i]) st.pop();
            st.push(i);
            maxi(ans, st.size());
        }
        cout << ans;
    }
}

namespace subtask5{
    int b[N];
    void solve(){
        mem(b, 0x3f);
        int ans = 0;
        for (int i = 1; i <= n; i++){
            int id = lower_bound(b + 1, b + n + 1, a[i]) - b;
            b[id] = a[i];
            maxi(ans, id);
        }
        cout << ans;
    }
}

namespace subtask6{
    int R[N];
    pii b[N];
    deque<int> dq;
    struct SEGTREE{
        int lz[N << 2];
        int val[N << 2];
        SEGTREE(){};
        void build(int id, int l, int r){
            if (l == r) return void(val[id] = lz[id] = -mod);
            int m = (l + r) >> 1;
            build(id << 1, l, m);
            build(id << 1 | 1, m + 1, r);
            val[id] = lz[id] = -mod;
        }
        void down(int id, int l, int r){
            maxi(val[id], lz[id]);
            if (l < r){
                maxi(lz[id << 1], lz[id]);
                maxi(lz[id << 1 | 1], lz[id]);
            }
            lz[id] = -mod;
        }
        void update(int id, int l, int r, int u, int v, int x){
            down(id, l, r);
            if (l > v || r < u) return;
            if (l >= u && r <= v){
                maxi(lz[id], x);
                down(id, l, r);
                return;
            }
            int m = (l + r) >> 1;
            update(id << 1, l, m, u, v, x);
            update(id << 1 | 1, m + 1, r, u, v, x);
            val[id] = max(val[id << 1], val[id << 1 | 1]);
        }
        int get(int id, int l, int r, int u, int v){
            down(id, l, r);
            if (l > v || r < u) return -mod;
            if (l >= u && r <= v) return val[id];
            int m = (l + r) >> 1;
            return max(get(id << 1, l, m, u, v), get(id << 1 | 1, m + 1, r, u, v));
        }
        void update(int l, int r, int x){
            assert(r <= n);
            update(1, 1, n, l, r, x);
        }
        int get(int l, int r){
            assert(r <= n);
            return get(1, 1, n, l, r);
        }
    } ST;
    bool cmp(pii x, pii y){
        if (x.fi == y.fi) return x.se < y.se;
        return x.fi > y.fi;
    }
    void solve(){
        ST.build(1, 1, n);
        mem(R, -0x3f);
        for (int i = n; i >= 1; i--){
            if (i < n - D) R[i] = ST.get(a[i], a[i]);
            while (dq.size() && a[dq.back()] >= a[i]) dq.pop_back();
            dq.push_back(i);
            if (i <= n - D){
                if (dq.front() >= i + D) dq.pop_front();
                ST.update(1, a[dq.front()] - 1, max(-(i + D - 1), -n));
            }
        }
        ST.build(1, 1, n);
        for (int i = 1; i <= n; i++)
            maxi(R[i], -n);
        for (int i = 1; i <= n; i++)
            b[i] = {a[i], i};
//        for (int i = 1; i <= n; i++)
//            cout << i << ' ' << -R[i] << '\n';
        sort(b + 1, b + n + 1, cmp);
        for (int i = 1; i <= n; i++){
            int id = b[i].se;
            int tmp = max(ST.get(id + 1, -R[id]), 0) + 1;
            ST.update(id, id, tmp);
        }
        cout << ST.get(1, n);
    }
}

int main(){
    load();
    input();
    compress();
    subtask6::solve();
}

Compilation message (stderr)

Main.cpp: In instantiation of 'bool maxi(T1&, T2) [with T1 = int; T2 = long unsigned int]':
Main.cpp:85:32:   required from here
Main.cpp:19:66: warning: comparison of integer expressions of different signedness: 'int' and 'long unsigned int' [-Wsign-compare]
   19 | template <typename T1, typename T2> bool maxi(T1 &a, T2 b){if (a < b){a = b; return 1;} return 0;}
      |                                                                ~~^~~
Main.cpp: In function 'void load()':
Main.cpp:33:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |         freopen(name".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:34:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   34 |         freopen(name".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 14 / 14
• Subtask 2: 14 / 14
• Subtask 3: 20 / 20
• Subtask 4: 12 / 12
• Subtask 5: 5 / 5
• Subtask 6: 35 / 35