Submission #1278832

#	Time	Username	Problem	Language	Result	Execution time	Memory
1278832		nqc	Fortune Telling 2 (JOI14_fortune_telling2)	C++20	35 / 100	130 ms	61856 KiB

fortune_telling2

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

#define fi first
#define se second
#define ll long long
#define ull unsigned long long
#define pii pair<int, int>
#define pll pair<ll, ll>
#define pli pair<ll, int>
#define debug(x) cout << #x << " = " << x << '\n'
#define all(a) a.begin(), a.end()
#define SZ(a) (int)(a).size()

const int N = 2e5 + 5;
const int mod = 1e9 + 7;
const ll inf64 = 3e18;
const int inf32 = 2e9 + 5;

int n, k, a[N], b[N], t[N];
vector<int> cprs;

const int LG = 20;
int st[LG][N];

int getMax(int l, int r) {
    if(r < l) return 0;

    int k = __lg(r - l + 1);
    return max(st[k][l], st[k][r - (1 << k) + 1]);
}

struct MergeSortTree {
    int n;
    vector<vector<int>> node;

    MergeSortTree(int n) : n(n), node(n << 2) {}

    void Merge(vector<int> &a, vector<int> &b, vector<int> &c) {
        int i = 0, j = 0;
        while(i < SZ(a) && j < SZ(b)) {
            if(a[i] < b[j]) c.push_back(a[i++]);
            else c.push_back(b[j++]);
        }
        while(i < SZ(a)) c.push_back(a[i++]);
        while(j < SZ(b)) c.push_back(b[j++]);
    }

    void build(int id, int l, int r) {
        if(l == r) {
            node[id].push_back(t[l]);
            return;
        }

        int mid = (l + r) >> 1;
        build(id << 1, l, mid);
        build(id << 1 | 1, mid + 1, r);

        Merge(node[id << 1], node[id << 1 | 1], node[id]);
    }

    int get(int id, int l, int r, int x, int y, int v) {
        if(x <= l && r <= y) {
            return SZ(node[id]) - (lower_bound(all(node[id]), v) - node[id].begin());
        }

        int mid = (l + r) >> 1;
        if(mid < x) return get(id << 1 | 1, mid + 1, r, x, y, v);
        if(mid + 1 > y) return get(id << 1, l, mid, x, y, v);
        return get(id << 1, l, mid, x, y, v) + get(id << 1 | 1, mid + 1, r, x, y, v);
    }
    int get(int l, int r, int x) { return (l <= r ? get(1, 1, n, l, r, x) : 0); }
};

void solve() {
    cin >> n >> k;
    for(int i = 1; i <= n; i++) {
        cin >> a[i] >> b[i];
        cprs.push_back(a[i]);
        cprs.push_back(b[i]);
    }
    for(int i = 1; i <= k; i++) {
        cin >> t[i];
        cprs.push_back(t[i]);
    }

    sort(all(cprs)); cprs.erase(unique(all(cprs)), cprs.end());
    auto take = [&](int val) -> int {
        return lower_bound(all(cprs), val) - cprs.begin() + 1;
    };

    for(int i = 1; i <= k; i++) 
        st[0][take(t[i])] = i;
    for(int k = 1; k < LG; k++) {
        for(int i = 1; i + (1 << k) - 1 <= SZ(cprs); i++) 
            st[k][i] = max(st[k - 1][i], st[k - 1][i + (1 << (k - 1))]);
    }

    MergeSortTree seg(k);
    seg.build(1, 1, k);

    ll ans = 0;
    for(int i = 1; i <= n; i++) {
        int mn = min(a[i], b[i]), mx = max(a[i], b[i]);
        int p = getMax(take(mn), take(mx) - 1);

        if(p > 0) a[i] = mx, b[i] = mn;

        int cnt = seg.get(p + 1, k, max(a[i], b[i]));
        ans += (cnt & 1 ? b[i] : a[i]);
    }
    cout << ans << '\n';
}

int main() {
    auto start = chrono::steady_clock::now();

    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    if(fopen("input.txt", "r")) {
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
    }
    int test = 1; 
    // cin >> test;
    while(test--) solve();
    
    chrono::duration<double> elapsed {chrono::steady_clock::now() - start};
    cerr << "\n>> Runtime: " << elapsed.count() << "s\n";
}

Compilation message (stderr)

fortune_telling2.cpp: In function 'int main()':
fortune_telling2.cpp:120:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  120 |         freopen("input.txt", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
fortune_telling2.cpp:121:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  121 |         freopen("output.txt", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 4 / 4
• Subtask 2: 31 / 31
• Subtask 3: 0 / 65