Submission #868623

#	Time	Username	Problem	Language	Result	Execution time	Memory
868623		prohacker	Financial Report (JOI21_financial)	C++14	100 / 100	358 ms	50372 KiB

Main

#include <bits/stdc++.h>
#define ll long long
#define ld long double

using namespace std;

const int N = 3e5+10;
const int INF = INT_MAX;
const int mod = 1e9+7;

int n,rmq[N][19];
int a[N],dp[N];
int D,lg[N];
multiset<int> s;
pair<int,int> b[N];

void pre_calc() {
    for(int i = 1 ; i < D ; i++) {
        s.insert(a[i]);
        rmq[i][0] = mod;
    }
    for(int i = D ; i <= n ; i++) {
        s.insert(a[i]);
        rmq[i][0] = *s.begin();
        s.erase(s.find(a[i-D+1]));
    }
    for(int j = 1 ; (1 << j) <= n ; j++) {
        for(int i = 1 ; i + (1 << j) - 1 <= n ; i++) {
            rmq[i][j] = max(rmq[i][j-1],rmq[i+(1<<j-1)][j-1]);
        }
    }
    for(int i = 1 ; i <= n ; i++) {
        b[i] = {a[i],i};
    }
}

int get(int u, int v) {
    int k = lg[v-u+1];
    return max(rmq[u][k],rmq[v-(1<<k)+1][k]);
}

int Find(int st) {
    int l = st+D;
    int r = n;
    int res = n;
    while(l <= r) {
        int mid = l + r >> 1;
        if(get(st+D,mid) > a[st]) {
            res = mid;
            r = mid-1;
        }
        else {
            l = mid+1;
        }
    }
    return res;
}

int tree[4*N];

void update(int pos, int val, int id = 1, int l = 1, int r = n) {
    if(l == r) {
        tree[id] = max(tree[id],val);
        return;
    }
    int mid = l + r >> 1;
    if(pos <= mid) {
        update(pos,val,id << 1,l,mid);
    }
    else {
        update(pos,val,id << 1 | 1,mid+1,r);
    }
    tree[id] = max(tree[id << 1],tree[id << 1 | 1]);
}

int get_dp(int u, int v, int id = 1, int l = 1, int r = n) {
    if(v < l or r < u) {
        return 0;
    }
    if(u <= l and r <= v) {
        return tree[id];
    }
    int mid = l + r >> 1;
    return max(get_dp(u,v,id << 1,l,mid),get_dp(u,v,id << 1 | 1,mid+1,r));
}

signed main()
{
    if (fopen("financial.inp", "r")) {
        freopen("financial.inp", "r", stdin);
        freopen("financial.out", "w", stdout);
    }
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin >> n >> D;
    for(int i = 1 ; i <= n ; i++) {
        cin >> a[i];
    }
    for(int i = 1 ; i <= n ; i++) {
        lg[i] = __lg(i);
    }
    pre_calc();
    sort(b+1,b+n+1,[](pair<int,int> u, pair<int,int> v) {
        if(u.first != v.first) {
            return u.first > v.first;
         }
         return u.second < v.second;
    });
    for(int i = 1 ; i <= n ; i++) {
        update(b[i].second,get_dp(b[i].second+1,Find(b[i].second))+1);
    }
    cout << tree[1];
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'void pre_calc()':
Main.cpp:29:52: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   29 |             rmq[i][j] = max(rmq[i][j-1],rmq[i+(1<<j-1)][j-1]);
      |                                                   ~^~
Main.cpp: In function 'int Find(int)':
Main.cpp:47:21: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   47 |         int mid = l + r >> 1;
      |                   ~~^~~
Main.cpp: In function 'void update(int, int, int, int, int)':
Main.cpp:66:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   66 |     int mid = l + r >> 1;
      |               ~~^~~
Main.cpp: In function 'int get_dp(int, int, int, int, int)':
Main.cpp:83:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   83 |     int mid = l + r >> 1;
      |               ~~^~~
Main.cpp: In function 'int main()':
Main.cpp:90:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   90 |         freopen("financial.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:91:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   91 |         freopen("financial.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