1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
#include <bits/stdc++.h>
#include <iostream>
using namespace std;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int32_t n;
    int32_t m;
    cin >> n;
    cin >> m;
    auto tab = new int32_t[1000002][3];
    for (int i = 1; i <= n; i++)
        for (int j = 0; j < 3; j++)
            tab[i][j] = 0;


    int32_t l, r, k;
    while (m--)
    {
        cin >> l;
        cin >> r;
        cin >> k;
        --k;
        tab[l][k]++;
        tab[r + 1][k]--;
    }

    int32_t k0 = 0;
    int32_t k1 = 0;
    int32_t k2 = 0;
    int32_t greens = 0;
    for (int i = 1; i <= n; ++i)
    {
        k0 += tab[i][0];
        k1 += tab[i][1];
        k2 += tab[i][2];

        if (k0 > 0 && k1 > 0 && k2 <= 0)
            ++greens;
    }
    cout << greens;
    return 0;
}