也帮我卡一下
#include<bits/stdc++.h>
#define int long long
using namespace std;
int c, t, n, m, ans;
int hs[5000005];
map<int, int> mp;
signed main() {
freopen("set.in", "r", stdin);
freopen("set.out", "w", stdout);
ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
srand(time(0));
cin >> c >> t;
while (t--) {
ans = 0;
cin >> n >> m;
memset(hs, 0, sizeof hs);
mp.clear();
while (m--) {
int base = rand();
int k;
cin >> k;
while (k--) {
int l, r;
cin >> l >> r;
hs[l] ^= base;
hs[r + 1] ^= base;
}
}
for (int i = 1; i <= n; i++) hs[i] ^= hs[i - 1];
for (int i = 1; i <= n; i++) mp[hs[i]]++;
for (int i = 1; i <= n; i++) ans += mp[hs[i]] == 1;
cout << ans << "\n";
}
return 0;
}