Submission #508586

#	Time	Username	Problem	Language	Result	Execution time	Memory
508586		79brue	Matryoshka (JOI16_matryoshka)	C++14	0 / 100	1 ms	460 KiB

matryoshka

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

struct Query{
    int x, y, idx;
    Query(){}
    Query(int x, int y, int idx): x(x), y(y), idx(idx){}

    bool operator<(const Query &r)const{
        return y!=r.y ? y<r.y : x<r.x;
    }
};

struct Fenwick {
    int tree[1000002];
    int n = 1000000;

    void add(int x, int v){
        assert(x<=n);
        while(x<=n){
            tree[x] += v;
            x += x&-x;
        }
    }

    int sum(int x){
        assert(x<=n);
        int ret=0;
        while(x){
            ret += tree[x];
            x -= x&-x;
        }
        return ret;
    }
} tree;

int n, q;
pair<int, int> arr[200002];
Query query[200002];
set<pair<int, int> > st;
int ans[200002];

void renumber(){
    vector<int> vec;
    for(int i=1; i<=n; i++) vec.push_back(arr[i].first);
    for(int i=1; i<=q; i++) vec.push_back(query[i].x);
    sort(vec.begin(), vec.end());
    vec.erase(unique(vec.begin(), vec.end()));
    for(int i=1; i<=n; i++) arr[i].first = lower_bound(vec.begin(), vec.end(), arr[i].first) - vec.begin() + 1;
    for(int i=1; i<=q; i++) query[i].x = lower_bound(vec.begin(), vec.end(), query[i].x) - vec.begin() + 1;
}

int main(){
    scanf("%d %d", &n, &q);
    for(int i=1; i<=n; i++){
        scanf("%d %d", &arr[i].first, &arr[i].second);
    }
    for(int i=1; i<=q; i++){
        scanf("%d %d", &query[i].x, &query[i].y);
        query[i].idx = i;
    }
    renumber();
    sort(arr+1, arr+n+1, [&](pair<int, int> x, pair<int, int> y){
        return x.second != y.second ? x.second < y.second : x.first > y.first;
    });
    sort(query+1, query+q+1);

    int pnt = 1;
    for(int i=1; i<=q; i++){
        while(pnt <= n && query[i].y >= arr[pnt].second){
            tree.add(arr[pnt].first, 1);

            auto it = st.lower_bound(make_pair(arr[pnt].first, -1));
            if(it == st.begin()){
                st.insert(make_pair(arr[pnt].first, pnt));
                pnt++;
                continue;
            }
            --it;
            tree.add(it->first, -1);
            st.insert(make_pair(arr[pnt].first, pnt));
            st.erase(it);
            ++pnt;
        }

        ans[query[i].idx] = tree.sum(1000000) - tree.sum(query[i].x - 1);
    }

    for(int i=1; i<=q; i++) printf("%d\n", ans[i]);
}

Compilation message (stderr)

matryoshka.cpp: In function 'int main()':
matryoshka.cpp:57:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   57 |     scanf("%d %d", &n, &q);
      |     ~~~~~^~~~~~~~~~~~~~~~~
matryoshka.cpp:59:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   59 |         scanf("%d %d", &arr[i].first, &arr[i].second);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
matryoshka.cpp:62:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   62 |         scanf("%d %d", &query[i].x, &query[i].y);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 11
• Subtask 2: 0 / 15
• Subtask 3: 0 / 25
• Subtask 4: 0 / 49