Submission #971452

#	Time	Username	Problem	Language	Result	Execution time	Memory
971452		andro	Examination (JOI19_examination)	C++14	2 / 100	75 ms	17052 KiB

examination

#include <bits/stdc++.h>

#define int long long

using namespace std;

const int N = 4e5 + 5;

struct fenw {
    int t[N];
    void add(int i, int val){
        i += 1;
        for(; i < N; i += i & - i) {
            t[i] += val;
        }
    }
    int query(int i) {
        int ans = 0;
        i += 1;
        for(; i > 0; i -= i & - i) {
            ans += t[i];
        }
        return ans;
    }
    int query(int l, int r) {
        l += 1;
        r += 1;
        return query(r) - query(l - 1);
    }
}fenw1, fenw2;

signed main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n, q;
    cin >> n >> q;
    vector<pair<int,int>> a(n + 1);
    for(int i = 1; i <= n; i++) {
        cin >> a[i].first >> a[i].second;
    }
    if(n <= 3000 && q <= 3000) {
        for(int i = 1; i <= q; i++) {
            int x, y, z;
            cin >> x >> y >> z;
            int ans = 0;
            for(int j = 1; j <= n; j++) {
                if(a[j].first >= x && a[j].second >= y && a[j].first + a[j].second >= z) {
                    ans += 1;
                }
            }
            cout << ans << "\n";
        }
        return 0;
    }
    sort(a.begin() + 1, a.end());
    //cout << "\n";
    for(int i = 1; i <= n; i++) {
        //cout << a[i].first << " " << a[i].second << "\n";
    }
    //cout << "\n";
    vector<pair<int,int>> query1[n + 1];
    vector<pair<int,int>> saberi2[n + 1];
    vector<pair<int,int>> oduzmi2[n + 1];
    int index = 1;
    vector<int> ans(q + 1, 0);
    while(q--) {
        int x, y, z;
        cin >> x >> y >> z;
        int l = 1, r = n, p = - 1;
        while(l <= r) {
            int mid = (l + r) / 2;
            if(a[mid].first >= x) {
                r = mid - 1;
                p = mid;
            }
            else {
                l = mid + 1;
            }
        }
        if(p == - 1) {
            index += 1;
            continue;
        }
        /*
        int ans = 0;
        for(int i = p; i <= n; i++) {
            if(a[i].second >= max(z - a[i].first, y)) {
                ans += 1;
            }
        }
        cout << ans << "\n";*/
        //query[p].push_back({{y, z}, index++});
        l = p, r = n; int g = - 1;
        while(l <= r) {
            int mid = (l + r) / 2;
            if(z - a[mid].first >= y) {
                l = mid + 1;
                g = mid;
            }
            else {
                r = mid - 1;
            }
        }
        int ans = 0;
        //cout << index << " " << p << " " << g << "\n";
        if(g == - 1) {
            /*
            for(int i = p; i <= n; i++) {
                if(a[i].second >= y) {
                    ans += 1;
                }
            }*/
            query1[p].push_back({y, index++});
        }
        else {
            /*
            for(int i = p; i <= g; i++) {
                if(a[i].first + a[i].second >= z) {
                    ans += 1;
                }
            }*/
            saberi2[p].push_back({z, index});
            if(g + 1 <= n )
                oduzmi2[g + 1].push_back({z, index});
            /*
            for(int i = g + 1; i <= n; i++) {
                if(a[i].second >= y) {
                    ans += 1;
                }
            }*/
            if(g + 1 <= n) {
                query1[g + 1].push_back({y, index++});
            }
            else {
                index += 1;
            }
        }
    }
    for(int i = n; i > 0; i--) {
        fenw1.add(a[i].second, 1);
        fenw2.add(a[i].first + a[i].second, 1);
        for(auto it : query1[i]) {
            ans[it.second] += fenw1.query(it.first, N - 1);
            /*
            for(int j = i; j <= n; j += 1) {
                if(a[j].second >= it.first) {
                    ans[it.second] += 1;
                }
            }*/
        }
        for(auto it : saberi2[i]) {
            ans[it.second] += fenw2.query(it.first, N - 1);
            /*
            for(int j = i; j <= n; j += 1) {
                if(a[j].first + a[j].second >= it.first) {
                    ans[it.second] += 1;
                }
            }*/
        }
        for(auto it : oduzmi2[i]) {
            ans[it.second] -= fenw2.query(it.first, N - 1);
            /*
            for(int j = i; j <= n; j += 1) {
                if(a[j].first + a[j].second >= it.first) {
                    ans[it.second] -= 1;
                }
            }*/
        }
    }
    for(int i = 1; i < index; i++) {
        cout << ans[i] << "\n";
    }
}

Compilation message (stderr)

examination.cpp: In function 'int main()':
examination.cpp:104:13: warning: unused variable 'ans' [-Wunused-variable]
  104 |         int ans = 0;
      |             ^~~

• Subtask 1: 2 / 2
• Subtask 2: 0 / 20
• Subtask 3: 0 / 21
• Subtask 4: 0 / 57