Submission #172749

#	Time	Username	Problem	Language	Result	Execution time	Memory
172749		arnold518	Matryoshka (JOI16_matryoshka)	C++14	11 / 100	2 ms	504 KiB

matryoshka

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

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int MAXN = 2e5;

struct Point
{
    int x, y;
};

int N, Q;
Point A[MAXN+10];

int main()
{
    int i, j;

    scanf("%d%d", &N, &Q);
    for(i=1; i<=N; i++) scanf("%d%d", &A[i].x, &A[i].y);

    sort(A+1, A+N+1, [&](const Point &p, const Point &q)
         {
             if(p.x!=q.x) return p.x<q.x;
             return p.y<q.y;
         });

    vector<Point> V;

    multimap<int, int> S;
    for(i=1; i<=N; )
    {
        for(j=i; j<=N && A[j].x==A[i].x; j++)
        {
            auto it = S.lower_bound(A[j].y);
            if(it==S.begin()) continue;
            it--;
            V.push_back({it->second, A[j].y});
            S.erase(it);
        }
        for(j=i; j<=N && A[j].x==A[i].x; j++)
        {
            S.insert(pii(A[j].y, A[j].x));
        }
        i=j;
    }

    while(Q--)
    {
        int a, b;
        scanf("%d%d", &a, &b);
        int ans=0;
        for(j=1; j<=N; j++) if(A[j].x>=a && A[j].y<=b) ans++;
        for(j=0; j<V.size(); j++) if(V[j].x>=a && V[j].y<=b) ans--;
        printf("%d\n", ans);
    }
}

Compilation message (stderr)

matryoshka.cpp: In function 'int main()':
matryoshka.cpp:57:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(j=0; j<V.size(); j++) if(V[j].x>=a && V[j].y<=b) ans--;
                  ~^~~~~~~~~
matryoshka.cpp:22:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &N, &Q);
     ~~~~~^~~~~~~~~~~~~~~~
matryoshka.cpp:23:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for(i=1; i<=N; i++) scanf("%d%d", &A[i].x, &A[i].y);
                         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
matryoshka.cpp:54:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d", &a, &b);
         ~~~~~^~~~~~~~~~~~~~~~

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