Submission #1260920

#	Time	Username	Problem	Language	Result	Execution time	Memory
1260920		raymoo_	Index (COCI21_index)	C++17	60 / 110	2595 ms	8260 KiB

index

#include<bits/stdc++.h>
using namespace std; 
#define fi first
#define se second
#define pb push_back
#define eb emplace_back
#define umap unordered_map
#define prq priority_queue
#define vect vector
#define rs resize
#define bend(v) v.begin(),v.end()
#define pob pop_back
#define pof pop_front
#define lwb lower_bound
#define upb upper_bound
#define pii pair<int,int>
#define nextl cout << '\n'
#define el '\n'
#define deb cout<<"\nok\n";return 
#define ll long long
#define dbl long double
#define popcnt __builtin_popcount
#define ctz __builtin_ctz
#define FILE "ellencute"
 
const ll INF=902337203695775807, N=2e5+69, MOD=1e9+7;    
 
void ffopen(){
    if(fopen(FILE".inp", "r")){
        freopen(FILE".inp", "r", stdin);
        freopen(FILE".out", "w", stdout);
    }else if(fopen("ellencute.inp", "r")){
        freopen("ellencute.inp", "r", stdin);
        freopen("ellencute.out", "w", stdout);
    }
}

int pm(int a,const int b=1e9+7){return ((a%b)+b)%b;}
int sq(int x){return x*x;}
ll __lcm(ll a, ll b, const ll lim=LLONG_MAX){
    if(a == -1 || b == -1)return -1;
    ll g = __gcd(a,b);
    if(b/g > lim/a)return -1;
    return (a/g)*b;
}


int t[4*N], lz[4*N];


struct Seggs{
    Seggs(){build();}
    void build(int l=1, int r=2e5, int id=1){
        if(l == r){
            t[id] = -l;
            return;
        }
        int mid = (l+r)/2;

        build(l, mid, id*2);
        build(mid+1, r, id*2+1);
        t[id] = max(t[id*2], t[id*2+1]);
    }

    void push(int l, int r, int id, bool b=0){
        t[id] += lz[id];
        if(l < r){
            lz[id*2] += lz[id];
            lz[id*2+1] += lz[id];

            if(b){
                int mid = (l+r)/2;
                push(l, mid, id*2);
                push(mid+1, r, id*2+1);
                t[id] = max(t[id*2], t[id*2+1]);
            }
        }
        lz[id] = 0;
    }

    void upd(int p, int x, int l=1, int r=2e5, int id=1){
        push(l, r, id);
        if(l > p)return;
        if(r <= p){
            lz[id]+=x;
            push(l, r, id);
            return; 
        }
        int mid = (l+r)/2;
        upd(p, x, l, mid, id*2);
        upd(p, x, mid+1, r, id*2+1);
        t[id] = max(t[id*2], t[id*2+1]);
    }

    int get(int l=1, int r=2e5, int id=1){

        push(l, r, id, 1);

        if(l == r)return l;
        int mid = (l+r)/2;

        if(t[id*2+1]>=0)return get(mid+1, r, id*2+1);
        return get(l, mid, id*2);

    }
} sgt;

struct query{
    int l, r, id;
};

void sol(){
    int n, q;
    cin >> n >> q;
    int a[n], ans[q];
    for(int& i : a)cin >> i;
    query que[q];
    for(int i=0;q>i;i++){
        cin >> que[i].l >> que[i].r;
        que[i].l--;que[i].r--;
        que[i].id=i;
    }

    const int S = 5 * sqrt(n / log2(n));
    
    sort(que, que+q, [&](const query& a, const query& b){
        if(a.l/S != b.l/S)return a.l < b.l;

        if(a.l/S & 1)return a.r < b.r;
        return a.r > b.r;
    });

    int l=0, r=-1;
    for(auto [L, R, id] : que){

        // cout << sgt.get() << el;

        while(r<R)sgt.upd(a[++r], 1);
        while(l>L)sgt.upd(a[--l], 1);


        // cout << sgt.get() << el;

        while(r>R)sgt.upd(a[r--], -1);
        while(l<L)sgt.upd(a[l++], -1);



        ans[id] = sgt.get();
    }


    for(int i : ans)cout << i << el;
        
}

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    ffopen();
    int t=1;
    //cin >> t;
    while(t--)sol();
}
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Compilation message (stderr)

index.cpp: In function 'void ffopen()':
index.cpp:30:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |         freopen(FILE".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
index.cpp:31:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |         freopen(FILE".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
index.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("ellencute.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
index.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("ellencute.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 40 / 40
• Subtask 3: 0 / 50