Submission #1240575

#	Time	Username	Problem	Language	Result	Execution time	Memory
1240575		skibidi123	Financial Report (JOI21_financial)	C++20	0 / 100	129 ms	21548 KiB

Main

#include <bits/stdc++.h>
#define long long long
using namespace std;

void init(){
    #define task "main"
    if (fopen(task".INP","r")){
        freopen(task".INP","r",stdin);
        freopen(task".OUT","w",stdout);
    }
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
}

int N;
long D;
vector<long> A;
vector<int> dp, rk;
vector<long> vs;
vector< multiset<int> > ms;
vector<int> st;

// segment‑tree point‑update, range‑max query
void update(int o, int l, int r, int p, int v){
    if(l==r){
        if(v<0) st[o]=0;
        else st[o]=v;
        return;
    }
    int m=(l+r)>>1;
    if(p<=m) update(o<<1,l,m,p,v);
    else       update(o<<1|1,m+1,r,p,v);
    st[o]=max(st[o<<1],st[o<<1|1]);
}
int query(int o, int l, int r, int L, int R){
    if(L>R) return 0;
    if(L<=l&&r<=R) return st[o];
    int m=(l+r)>>1, res=0;
    if(L<=m) res=max(res, query(o<<1,l,m,L,R));
    if(R> m) res=max(res, query(o<<1|1,m+1,r,L,R));
    return res;
}

int main(){
    init();
    cin>>N>>D;
    A.resize(N+1);
    for(int i=1;i<=N;i++) cin>>A[i];

    // compress
    vs = A;
    sort(vs.begin()+1, vs.end());
    vs.erase(unique(vs.begin()+1, vs.end()), vs.end());
    int M = (int)vs.size()-1;
    rk.resize(N+1);
    for(int i=1;i<=N;i++){
        rk[i] = int(lower_bound(vs.begin()+1, vs.end(), A[i]) - vs.begin());
    }

    dp.assign(N+1,0);
    ms.assign(M+1, multiset<int>() );
    st.assign(4*(M+2), 0);

    int ans = 1;
    // we will insert j into structure when we pass it, and remove when it's too far
    for(int i=1, l=1; i<=N; i++){
        // add j = i-1
        if(i>1){
            int j = i-1, rj = rk[j];
            ms[rj].insert(dp[j]);
            update(1,1,M,rj, *ms[rj].rbegin());
        }
        // remove j = i-D-1
        if(i - l > D){
            int j = l, rj = rk[j];
            auto it = ms[rj].find(dp[j]);
            ms[rj].erase(it);
            if(ms[rj].empty()) update(1,1,M,rj, -1);
            else               update(1,1,M,rj, *ms[rj].rbegin());
            l++;
        }

        int ri = rk[i];
        // case 1: lấy từ những j có A[j]<A[i]
        int c1 = query(1,1,M,1,ri-1) + 1;
        // case 2: lấy từ những j có A[j]>=A[i]
        int c2 = query(1,1,M,ri,M);
        dp[i] = max(c1, c2);
        if(dp[i]==0) dp[i]=1;  // bắt đầu mới tại i

        if(i==N) ans = dp[i];
    }

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

Compilation message (stderr)

Main.cpp: In function 'void init()':
Main.cpp:8:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    8 |         freopen(task".INP","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
Main.cpp:9:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |         freopen(task".OUT","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 14
• Subtask 2: 0 / 14
• Subtask 3: 0 / 20
• Subtask 4: 0 / 12
• Subtask 5: 0 / 5
• Subtask 6: 0 / 35