Submission #1208113

#	Time	Username	Problem	Language	Result	Execution time	Memory
1208113		CodeLakVN	Osumnjičeni (COCI21_osumnjiceni)	C++20	0 / 110	21 ms	1932 KiB

Main

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

#define task "main"
#define no "NO"
#define yes "YES"
#define F first
#define S second
#define vec vector
#define _mp make_pair
#define ii pair<int, int>
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define evoid(val) return void(std::cout << val)
#define FOR(i, a, b) for(int i = (a); i <= (b); ++i)
#define FOD(i, b, a) for(int i = (b); i >= (a); --i)

const int MAX_N = (int)2e5 + 5;
const int S = 450;

int n, q;
ii seg[MAX_N];
ii query[MAX_N];

struct BIT {
    int bit[MAX_N];

    void update(int idx, int val) {
        for (; idx <= n; idx += (idx & -idx))
            bit[idx] += val;
    }

    void update(int l, int r, int val) {
        update(l, val);
        update(r + 1, -val);
    }

    int get(int idx) {
        int res = 0;
        for (; idx > 0; idx -= (idx & -idx))
            res += bit[idx];
        return res;
    }

    int get(int l, int r) {
        return get(r) - get(l - 1);
    }
};

struct BIT_LAZY {
    BIT bitAdd, bitSub;

    void update(int l, int r, int val) {
        bitAdd.update(l, r, val);
        bitSub.update(l, r, (l - 1) * val);
        bitSub.update(r + 1, (-r + l - 1) * val);
    }

    int get(int idx) {
        return idx * bitAdd.get(idx) - bitSub.get(idx);
    }

    int get(int l, int r) {
        return get(r) - get(l - 1);
    }
} bit;

int maxR[MAX_N];

void init() {
    int l = 1;
    FOR(r, 1, n) {
        while (bit.get(seg[r].F, seg[r].S) != 0) {
            bit.update(seg[l].F, seg[l].S, -1);
            maxR[l] = r - 1;
            l++;
        }
        bit.update(seg[r].F, seg[r].S, 1);
    }
    for (; l <= n; l++) maxR[l] = n;
}

int block[MAX_N];
int cnt[MAX_N], nxt[MAX_N];

void build() {
    FOR(i, 1, n) block[i] = (i - 1) / S;
    FOD(i, n, 1) {
        int maxRI = maxR[i] + (maxR[i] < n ? 1 : 0);
        if (block[i] == block[n]) {
            nxt[i] = n + 1;
            if (i != n) cnt[i] = cnt[maxRI] + 1;
            continue;
        }    
        if (block[maxRI] != block[i]) {
            nxt[i] = maxRI;
            cnt[i] = 1;
        }
        else {
            nxt[i] = nxt[maxRI];
            cnt[i] = cnt[maxRI] + 1;
        }
    }
}   

int get(int l, int r) {
    int ans = 0;
    while (nxt[l] <= r) {
        ans += cnt[l];
        l = nxt[l];
    }
    while (l <= r) {
        ans++;
        l = maxR[l] + 1;
    }
    return ans;
}

void solve() {
    cin >> n;
    FOR(i, 1, n) cin >> seg[i].F >> seg[i].S;
    init();
    build();
    cin >> q;
    while (q--) {
        int l, r;
        cin >> l >> r;
        cout << get(l, r) << "\n";
    }
}

int32_t main() {
    if (fopen(task".inp", "r")) {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

    bool multitest = 0;
    int numTest = 1;
    if (multitest) cin >> numTest;

    while (numTest--) {
        solve();
    }

    return 0;
}

/* Lak lu theo dieu nhac!!!! */

Compilation message (stderr)

Main.cpp: In function 'int32_t main()':
Main.cpp:134:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  134 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:135:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  135 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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