Submission #368120

#	Time	Username	Problem	Language	Result	Execution time	Memory
368120		leinad2	Rectangles (IOI19_rect)	C++17	0 / 100	4 ms	768 KiB

rect

#include "rect.h"
#include<bits/stdc++.h>
using namespace std;
long long count_rectangles(vector<vector<int> > a)
{
    int n=a.size();
    int m=a[0].size();
    int i, j, k, l;
    long long ans=0;
    vector<pair<int, int> >v[2510];
    map<pair<int, int>, vector<int> >mp;
    for(i=1;i<n-1;i++)
    {
        vector<int>V;
        for(j=0;j<m;j++)
        {
            while(V.size()&&a[i][V.back()]<a[i][j])
            {
                if(V.back()+1<j)v[i].push_back({V.back(), j});
                V.pop_back();
            }
            if(V.size()&&V.back()+1<j)v[i].push_back({V.back(), j});
            V.push_back(j);
        }
    }
    for(j=1;j<m-1;j++)
    {
        vector<int>V;
        for(i=0;i<n;i++)
        {
            while(V.size()&&a[V.back()][j]<a[i][j])
            {
                if(V.back()+1<i)mp[{V.back(), i}].push_back(j);
                V.pop_back();
            }
            if(V.size()&&V.back()+1<i)mp[{V.back(), i}].push_back(j);
            V.push_back(i);
        }
    }
    for(i=1;i<n-1;i++)
    {
        for(j=i;j<n-1;j++)
        {
            if(mp.find({i-1, j+1})==mp.end())continue;
            vector<int>V=mp[{i-1, j+1}];
            int A[2510]={};
            for(k=0;k<V.size();k++)A[V[k]]++;
            for(k=1;k<m;k++)
            {
                A[k]+=A[k-1];
            }
            map<pair<int, int>, int>mp2;
            for(k=i;k<=j;k++)
            {
                for(l=0;l<v[k].size();l++)
                {
                    mp2[v[k][l]]++;
                }
            }
            map<pair<int, int>, int>::iterator it;
            for(it=mp2.begin();it!=mp2.end();it++)
            {
                if(it->second==j-i+1)
                {
                    if(A[it->first.second-1]-A[it->first.first]==it->first.second-1-it->first.first)ans++;
                }
            }
        }
    }
	return ans;
}

Compilation message (stderr)

rect.cpp: In function 'long long int count_rectangles(std::vector<std::vector<int> >)':
rect.cpp:47:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |             for(k=0;k<V.size();k++)A[V[k]]++;
      |                     ~^~~~~~~~~
rect.cpp:55:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |                 for(l=0;l<v[k].size();l++)
      |                         ~^~~~~~~~~~~~

• Subtask 1: 0 / 8
• Subtask 2: 0 / 7
• Subtask 3: 0 / 12
• Subtask 4: 0 / 22
• Subtask 5: 0 / 10
• Subtask 6: 0 / 13
• Subtask 7: 0 / 28