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
#include <bits/stdc++.h>

using namespace std;

#define LL long long
#define ULL unsigned LL
#define LD long double

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	int n, m;
	cin>>n>>m;
	int l, r, k;
	vector<vector<int>> op(n+2);
	for(int i=0; i<m; i++) {
		cin>>l>>r>>k;
		op[l].push_back(k);
		op[r+1].push_back(-k);
	}
	vector<int> cnt(4, 0);
	int ans = 0;
	for(int i=1; i<=n; i++) {
		for(auto x : op[i]) {
			if(x > 0)
				cnt[x]++;
			else
				cnt[-x]--;
		}
		if(cnt[1] && cnt[2] && !cnt[3])
			ans++;
	}
	cout<<ans;
}