Submission #1272436

#	Time	Username	Problem	Language	Result	Execution time	Memory
1272436		huudai	Examination (JOI19_examination)	C++20	22 / 100	3093 ms	4132 KiB

examination

#include<bits/stdc++.h>

using namespace std;

#define ll long long
#define pii pair<int, int>
#define pll pair<long long, long long>
#define fi first
#define se second
#define pb push_back

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

template<typename t1, typename t2> bool maximize(t1 &a, t2 b){
    if(a < b) a  = b; else return 0; return 1;
}
template<typename t1, typename t2> bool minimize(t1 &a, t2 b){
    if(a > b) a  = b; else return 0; return 1;
}

#define file "anhdep"

const int maxn = 1e5 + 5;
const int oo = 1e9;
const ll OO = 1e18;
const int MOD = 1e9 + 7;

int n, q;
pii a[maxn];
bool oksub2;
vector<int> comnum;

struct item{
    int x, y, z, id;
    item(){}
    item(int a, int b, int c, int d){
        x = a, y = b, z = c, id = d;
    }
};

item query[maxn];

void input(){
    cin >> n >> q;
    oksub2 = 1;
    for(int i = 1; i <= n; i++) {
        cin >> a[i].fi >> a[i].se;
    }
    for(int i = 1; i <= q; i++){
        cin >> query[i].x >> query[i].y >> query[i].z;
        query[i].id = i;
        if(query[i].z != 0)
            oksub2 = 0;

    }
}

namespace sub1{
    void sol(){
        for(int i = 1; i <= q; i++){
            int x = query[i].x;
            int y = query[i].y;
            int z = query[i].z;
            int ans = 0;
            for(int j = 1 ; j <= n; j++)
                ans += (a[j].fi >= x) && (a[j].se >= y) && (a[j].fi + a[j].se >= z);
            cout << ans << '\n';
        }
    }
}

namespace sub2{
    int ans[maxn];
    const int lmt = 1e5 + 1;
    struct fenwick{
        int fw[maxn];
        fenwick(){
            memset(fw, 0, sizeof(fw));
        }

        void update(int id, int val){
            id++;
            id = lmt - id + 1;
            for(;id <= lmt; id += id & -id) fw[id] += val;
        }

        int get(int id){
            id++;
            id = lmt - id + 1;
            int ret = 0;
            for(;id > 0; id -= id & -id) ret += fw[id];
            return ret;
        }
    } tree;

    bool cmp(item a, item b){
        if(a.x == b.x) return a.y > b.y;
        return a.x > b.x;
    }

    void sol(){
        sort(a + 1, a + 1 + n, greater<pii>());
        sort(query + 1, query + 1 + q, cmp);

        int p = 1;
        for(int i = 1; i <= q; i++){
            int x = query[i].x;
            int y = query[i].y;
            int z = query[i].z;
            int id = query[i].id;

            while(p <= n && a[p].fi >= x){
                tree.update(a[p].se, 1);
                p++;
            }
            ans[id] = tree.get(y);
        }

        for(int i = 1; i <= q; i++){
            cout << ans[i] << '\n';
        }
    }
}
signed main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    // freopen(file".inp", "r", stdin);
    // freopen(file".out", "w", stdout);

    input();

    if(max(n, q) <= 3000)
        sub1::sol();
    else if(oksub2)
        sub2::sol();
    else
        sub1::sol();

    return 0;
}

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