Submission #1101122

#	Time	Username	Problem	Language	Result	Execution time	Memory
1101122		InvMOD	Poklon (COCI17_poklon)	C++14	140 / 140	1035 ms	39356 KiB

poklon

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

#define fi first
#define se second
#define gcd __gcd
#define sz(v) v.size()
#define pb push_back
#define pi pair<int,int>
#define all(v) (v).begin(), (v).end()
#define FOR(i, a, b) for(int i = (a); i <= (b); i++)
#define int long long

using ll = long long;
using ld = long double;
using ull = unsigned long long;

template<typename T> bool ckmx(T &a, T b){if(a < b) return a = b, true; return false;}
template<typename T> bool ckmn(T &a, T b){if(a > b) return a = b, true; return false;}

const int N = 5e5+5;
const ll MOD = 1e9+7;
const ll INF = 1e18;
const int SZ = 750;

struct Query{
    int l,r,id;
};
int a[N], ans[N], mp[N], cnt[N], res = 0;
Query Q[N];
vector<int> tmp;

void add(int x){
    if(cnt[mp[x]] == 2) res--;
    cnt[mp[x]]++;
    if(cnt[mp[x]] == 2) res++;
    return;
}

void rem(int x){
    if(cnt[mp[x]] == 2) res--;
    cnt[mp[x]]--;
    if(cnt[mp[x]] == 2) res++;
    return;
}

void solve()
{
    int n,q; cin >> n >> q;
    FOR(i, 1, n){
        cin >> a[i];
        tmp.pb(a[i]);
    }

    tmp.pb(0);
    sort(all(tmp));
    tmp.erase(unique(all(tmp)), tmp.end());
    FOR(i, 0, n){
        int p = lower_bound(all(tmp), a[i]) - tmp.begin();
        mp[i] = p;
    }

    FOR(i, 1, q){
        cin >> Q[i].l >> Q[i].r;
        Q[i].id = i;
    }

    sort(1 + Q, 1+q+Q, [&](Query x, Query y){
        if(x.l/SZ != y.l/SZ) return x.l < y.l;
        else return ((x.l/SZ)&1 ? (x.r < y.r) : (x.r > y.r));
    });

    res = 0;
    int cl = 0, cr = 0;
    add(0);
    FOR(i, 1, q){
        while(cr < Q[i].r) add(++cr);
        while(cl < Q[i].l) rem(cl++);
        while(cr > Q[i].r) rem(cr--);
        while(cl > Q[i].l) add(--cl);
        ans[Q[i].id] = res;
    }

    FOR(i, 1, q) cout << ans[i] <<"\n";
}

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

    #define name "InvMOD"
    if(fopen(name".INP", "r")){
        freopen(name".INP","r",stdin);
        freopen(name".OUT","w",stdout);
    }

    int t = 1; //cin >> t;
    while(t--) solve();
    return 0;
}

Compilation message (stderr)

poklon.cpp: In function 'int main()':
poklon.cpp:95:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   95 |         freopen(name".INP","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
poklon.cpp:96:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   96 |         freopen(name".OUT","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 140 / 140