1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
#include <iostream>
using namespace std;

int ile[3][2000005];
const int N = 1000000;
long long ans;
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n;
    cin >> n;
    for (int i = 0; i < n; i++)
    {
        int o, w, t;
        cin >> o >> w >> t;
        ile[o][w - t + N]++;
    }
    for (int i = 0; i <= 2000000; i++)
        ans += min (ile[1][i], ile[2][i]);
    cout << ans;
}