Submission #1124389

#	Time	Username	Problem	Language	Result	Execution time	Memory
1124389		Cadoc	Financial Report (JOI21_financial)	C++17	48 / 100	11 ms	840 KiB

Main

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

#define el cout << '\n'
#define ll long long
#define pii pair<int, int>
#define fi first
#define se second
#define all(x) (x).begin(), (x).end()
#define pb push_back
#define eb emplace_back
#define all(x) (x).begin(), (x).end()
#define sz(x) (int)(x).size()
#define INF 0x3f3f3f3f
#define LINF 0x3f3f3f3f3f3f3f3f
#define MOD 1000000007
#define N 100005

int n, d;
int a[N];
int par[N], sz[N], l[N];
int dp[N], st[N << 2];

// dp(i) la day con tang dai nhat ket thuc tai i
// dp(i) = dp(j) + 1 (j den duoc i)

bool cmp(int i, int j){
    return pii(a[i], -i) < pii(a[j], -j);
}

int get(int u){
    return par[u] = (u == par[u]? u:get(par[u]));
}

int join(int u, int v){
    u = get(u), v = get(v);
    if(u == v) return 0;

    if(sz[u] < sz[v]) swap(u, v);

    sz[u] += sz[v];
    par[v] = u;
    l[u] = min(l[u], l[v]);

    return 1;
}

void upd(int id, int l, int r, int i, int x){
    if(i < l || r < i) return;
    if(l == r) return st[id] = x, void();
    int m = (l+r)>>1;
    upd(id<<1, l, m, i, x);
    upd(id<<1|1, m+1, r, i, x);
    st[id] = max(st[id<<1], st[id<<1|1]);
}

int get(int id, int l, int r, int u, int v){
    if(v < l || r < u) return 0;
    if(u <= l && r <= v) return st[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 Solve(){
    cin >> n >> d;
    for(int i=1; i<=n; ++i) cin >> a[i];

    vector<int> vec;
    for(int i=1; i<=n; ++i) vec.eb(i);

    sort(all(vec), cmp);

    for(int i=1; i<=n; ++i){
        par[i] = i;
        l[i] = max(1, i - d);
        sz[i] = 1;
    }

    int Ans = 1;
    set<int> s;
    for(int i:vec){
        set<int>::iterator it = s.lower_bound(i);
        if(it != s.end()){
            if(*it - i <= d) join(i, *it);
        }
        if(it != s.begin()){
            it--;
            if(i - *it <= d) join(i, *it);
        }

        int u = get(i);
        dp[i] = get(1, 1, n, l[u], i) + 1;
        upd(1, 1, n, i, dp[i]);

        Ans = max(Ans, dp[i]);

        s.insert(i);
    }

    cout << Ans;
}

int main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    #define NAME "TASK"
    if(fopen(NAME".inp", "r")){
        freopen(NAME".inp", "r", stdin);
        freopen(NAME".out", "w", stdout);
    }

    Solve();
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:108:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  108 |         freopen(NAME".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:109:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  109 |         freopen(NAME".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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