Submission #512836

#	Time	Username	Problem	Language	Result	Execution time	Memory
512836		couplefire	Examination (JOI19_examination)	C++17	100 / 100	1112 ms	94760 KiB

examination

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/trie_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
typedef tree<int, null_type, less_equal<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;
#define pii pair<int, int>
#define f first
#define s second

const int N = 100005;

int n, q, m;
ordered_set bit[N];
map<int, int> mp;
pii arr[N];
pair<pii, pii> queries[N];
int ans[N];

void upd(int x, int y){
    for(; x<N; x = (x|(x+1)))
        bit[x].insert(y);
}

int query(int x, int y){
    int res = 0;
    for(; x>=0; x = (x&(x+1))-1)
        res += bit[x].order_of_key(y+1);
    return res;
}

int main(){
    // freopen("a.in", "r", stdin);
    cin.tie(0)->sync_with_stdio(0);
    cin >> n >> q;
    vector<int> tmp;
    for(int i = 0; i<n; ++i)
        cin >> arr[i].f >> arr[i].s, tmp.push_back(arr[i].f);
    sort(arr, arr+n, [&](pii a, pii b){return a.f+a.s<b.f+b.s;});
    sort(tmp.begin(), tmp.end());
    tmp.erase(unique(tmp.begin(), tmp.end()), tmp.end());
    m = tmp.size();
    for(int i = 0; i<m; ++i)
        mp[tmp[i]] = i;
    for(int i = 0; i<q; ++i)
        cin >> queries[i].s.f >> queries[i].s.s >> queries[i].f.f, queries[i].f.s = i;
    sort(queries, queries+q);
    for(int i = q-1, j = n-1; i>=0; --i){
        while(j>=0 && arr[j].f+arr[j].s>=queries[i].f.f)
            upd(m-1-mp[arr[j].f], 1e9-arr[j].s), --j;
        int id = lower_bound(tmp.begin(), tmp.end(), queries[i].s.f)-tmp.begin();
        ans[queries[i].f.s] = query(m-1-id, 1e9-queries[i].s.s);
    }
    for(int i = 0; i<q; ++i)
        cout << ans[i] << '\n';
}

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