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OI-codes/Luogu/problem/P3391/P3391.cpp

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#include <bits/stdc++.h>
using namespace std;
int main() {
vector<int> a;
int n, m, l, r;
scanf("%d%d", &n, &m);
for (int i = 0; i <= n; i++) {
a.push_back(i);
}
for (int i = 0; i < m; i++) {
scanf("%d%d", &l, &r);
reverse(a.begin() + l, a.begin() + r + 1);
}
for (int i = 1; i < a.size(); i++) {
printf("%d ", a[i]);
}
printf("\n");
return 0;
}