Submission #172751

#	Time	Username	Problem	Language	Result	Execution time	Memory
172751		arnold518	Matryoshka (JOI16_matryoshka)	C++14	51 / 100	2066 ms	8392 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);
 
    while(Q--)
    {
        int a, b;
        scanf("%d%d", &a, &b);
        vector<Point> V;
        for(j=1; j<=N; j++) if(A[j].x>=a && A[j].y<=b) V.push_back({A[j].x, A[j].y});
        sort(V.begin(), V.end(), [&](const Point &p, const Point &q)
             {
                 if(p.x!=q.x) return p.x<q.x;
                 return p.y<q.y;
             });
 
        int ans=V.size();
        multiset<int> S;
        for(i=0; i<V.size();)
        {
            for(j=i; j<V.size() && V[j].x==V[i].x; j++)
            {
                auto it = S.lower_bound(V[j].y);
                if(it==S.begin()) continue;
                it--;
                S.erase(it); ans--;
            }
            for(j=i; j<V.size() && V[j].x==V[i].x; j++)
            {
                S.insert(V[j].y);
            }
            i=j;
        }
        printf("%d\n", ans);
    }
}

Compilation message (stderr)

matryoshka.cpp: In function 'int main()':
matryoshka.cpp:39:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(i=0; i<V.size();)
                  ~^~~~~~~~~
matryoshka.cpp:41:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for(j=i; j<V.size() && V[j].x==V[i].x; j++)
                      ~^~~~~~~~~
matryoshka.cpp:48:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for(j=i; j<V.size() && V[j].x==V[i].x; j++)
                      ~^~~~~~~~~
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:28:14: 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: 15 / 15
• Subtask 3: 25 / 25
• Subtask 4: 0 / 49