Submission #431678

#	Time	Username	Problem	Language	Result	Execution time	Memory
431678		cpp219	Financial Report (JOI21_financial)	C++14	100 / 100	951 ms	27544 KiB

Main

#pragma GCC optimization "O2"
#pragma GCC optimization "unroll-loop"
#pragma GCC target ("avx2")

#include <bits/stdc++.h>
#define ll int
#define ld long double
#define fs first
#define sc second
using namespace std;
const ll N = 3e5 + 9;
const ll inf = 1e9 + 7;
typedef pair<ll,ll> LL;

ll n,D,a[N],dp[N],id[N],ans;
ll st[4*N],lab[N];

void upd(ll id,ll l,ll r,ll u,ll val){
    if (u < l||r < u) return;
    if (l == r){
        st[id] = val; return;
    }
    ll mid = (l + r)/2;
    upd(id*2,l,mid,u,val); upd(id*2 + 1,mid + 1,r,u,val);
    st[id] = max(st[id*2],st[id*2 + 1]);
}

ll Get(ll id,ll l,ll r,ll u,ll v){
    if (v < l||r < u) return 0;
    if (u <= l&&r <= v) return st[id];
    ll mid = (l + r)/2;
    return max(Get(id*2,l,mid,u,v),Get(id*2 + 1,mid + 1,r,u,v));
}

bool lf(ll x,ll y){
    return a[x] < a[y] || (a[x] == a[y] && x > y);
}

ll par[N],mn[N];

ll Find(ll u){
    if (lab[u] < 0) return u;
    return lab[u] = Find(lab[u]);
}

void Union(ll p,ll q){
    ll r = Find(p),s = Find(q);
    if (r == s) return;
    if (lab[r] > lab[s]) swap(r,s);
    lab[r] += lab[s]; lab[s] = r;
    mn[r] = min(mn[r],mn[s]);
}
set<ll> s;
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0), cout.tie(0);
    #define task "tst"
    if (fopen(task".inp", "r")){
        freopen(task".inp", "r", stdin);
        //freopen(task".out", "w", stdout);
    }
    cin>>n>>D;
    for (ll i = 1;i <= n;i++) cin>>a[i],id[i] = i,mn[i] = i;
    sort(id + 1,id + n + 1,lf); memset(lab,-1,sizeof(lab));
    for (ll i = 1;i <= n;i++){
        auto it = s.lower_bound(id[i]);
        if (it != s.end()){
            if (abs(id[i] - *it) <= D) Union(id[i],*it);
        }
        if (it != s.begin()){
            it--;
            if (abs(id[i] - *it) <= D) Union(id[i],*it);
        }
        s.insert(id[i]);
        ll L = mn[Find(id[i])]; dp[i] = Get(1,1,n,L,id[i] - 1) + 1;
        upd(1,1,n,id[i],dp[i]); ans = max(ans,dp[i]);
        //cout<<id[i]<<" "<<dp[i]<<" "<<L<<" "<<i - 1<<"\n";
    }
    cout<<ans;
}

Compilation message (stderr)

Main.cpp:1: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    1 | #pragma GCC optimization "O2"
      | 
Main.cpp:2: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    2 | #pragma GCC optimization "unroll-loop"
      | 
Main.cpp: In function 'int main()':
Main.cpp:59:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   59 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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