Submission #933244

#	Time	Username	Problem	Language	Result	Execution time	Memory
933244		Whisper	Osumnjičeni (COCI21_osumnjiceni)	C++17	0 / 110	2 ms	348 KiB

Main

#include <bits/stdc++.h>

using namespace std;
using ll = long long;

#define int long long
#define FOR(i, a, b) for ( int i = a ; i <= b ; i++ )
#define FORD(i, a, b) for (int i = b; i >= a; i --)
#define REP(i, n) for (int i = 0; i < n; ++i)
#define REPD(i, n) for (int i = n - 1; i >= 0; --i)
#define pii pair<int , int>
#define Lg(x) 31 - __builtin_clz(x)

#define MASK(i) (1LL << (i))
#define BIT(x, i) (((x) >> (i)) & 1)

constexpr ll LINF = (1ll << 60);
constexpr int INF = (1ll << 30);
constexpr int MAX = 2e5 + 5;
constexpr int Mod = 1e9 + 7;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

void setupIO(){
    #define name "Whisper"
    //Phu Trong from Nguyen Tat Thanh High School for gifted student
    srand(time(NULL));
    cin.tie(nullptr)->sync_with_stdio(false); cout.tie(nullptr);
    freopen(name".inp", "r", stdin);
    freopen(name".out", "w", stdout);
    cout << fixed << setprecision(10);
}

template <class X, class Y>
    bool minimize(X &x, const Y &y){
        X eps = 1e-9;
        if (x > y + eps) {x = y; return 1;}
        return 0;
    }

template <class X, class Y>
    bool maximize(X &x, const Y &y){
        X eps = 1e-9;
        if (x + eps < y) {x = y; return 1;}
        return 0;
    }
int nArr, numQuery;
pair<int, int> a[MAX];
int nxt[MAX][22];
void Whisper(){
    cin >> nArr;
    for (int i = 1; i <= nArr; ++i) cin >> a[i].first >> a[i].second;
    set<pair<int, int>> s;

    auto Add = [&](pair<int, int> x){
        auto iter = s.lower_bound(x);
        if (iter != s.end()){
            pair<int, int> left = *(iter);
            if (left.first <= x.second) return false;
        }
        if (iter != s.begin()){
            pair<int, int> right = *prev(iter);
            if (right.second >= x.first) return false;
        }
        s.insert(x);
        return true;
    };
    FOR(i, 0, nArr + 2) FOR(k, 0, 21) nxt[i][k] = nArr + 1;
    int l = 1;
    for (int i = 1; i <= nArr; ++i){
        while (l <= nArr && Add(a[l])) l++;
        nxt[i][0] = l;
        s.erase(a[i]);
    }
    for (int i = nArr; i >= 0; --i){
        for (int k = 1; k <= 21; ++k){
            nxt[i][k] = nxt[nxt[i][k - 1]][k - 1];
        }
    }
    cin >> numQuery;
    for (int i = 1; i <= numQuery; ++i){
        int l, r; cin >> l >> r;
        int ans = 0;
        for (int i = 21; i >= 0; --i){
            if (nxt[l][i] <= r) ans += MASK(i), l = nxt[l][i];
        }
        cout << ans + 1 << '\n';
    }
}


signed main(){
    setupIO();
    int Test = 1;
//    cin >> Test;
    for ( int i = 1 ; i <= Test ; i++ ){
        Whisper();
        if (i < Test) cout << '\n';
    }
}

Compilation message (stderr)

Main.cpp: In function 'void setupIO()':
Main.cpp:28:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |     freopen(name".inp", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:29:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |     freopen(name".out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 20
• Subtask 4: 0 / 20
• Subtask 5: 0 / 50