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#include<bits/stdc++.h>
using namespace std;
bool cmp(pair<int, int>& a, pair<int, int>& b) {
return a.first < b.first;
}
int main() {
int l, m;
while (cin >> l >> m) {
vector<pair<int, int>> vec(m);
for (int i = 0; i < m; i++) {
pair<int, int> p;
cin >> p.first;
cin >> p.second;
vec[i] = p;
}
sort(vec.begin(), vec.end(), cmp);
vector<pair<int, int>> ranges;
pair<int, int> range;
range.first = vec[0].first;
range.second = vec[0].second;
...
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