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## Discussion of Problem 1196. History Exam

Help me, please! What is wrong? c++
Posted by Koloskova Mariia 10 Jul 2018 20:15
#include <iostream>
using namespace std;
int main()
{
int n,m,teacher[1500],student[100000],same=0;
cin>>n;
for(int i=0;i<n;i++)
cin>>teacher[i];
cin>>m;
for(int i=0;i<m;i++)
cin>>student[i];

for(int i=0;i<n;i++)
for(int j=0;j<m;j++)
if(teacher[i]==student[j]) same++;

cout<<same;
return 0;
}
Re: Help me, please! What is wrong? c++
Posted by David Espinoza 27 Dec 2018 23:36
Each date is a positive integer not exceeding 10^9, long long int teacher[], student[]
Re: Help me, please! What is wrong? c++
Posted by Name 28 Nov 2019 01:42
#include <bits/stdc++.h>

using namespace std;

#define ll long long

int main(){
int n1, n2;
cin >> n1;
vector <int> m1;
vector <int> m2;
m1.resize(n1);
for (int i = 0; i < m1.size(); i++)
cin >> m1[i];
cin >> n2;
m2.resize(n2);
for (int i = 0; i < m2.size(); i++)
cin >> m2[i];
int sum = 0;
sort(m1.begin(), m1.end());
for (int i = 0; i < m2.size(); i++){
if (binary_search(m1.begin(), m1.end(), m2[i]))
sum ++;
}
cout << sum;
return 0;
}