78 lines
1.5 KiB
C++
78 lines
1.5 KiB
C++
#include <bits/stdc++.h> // {{{
|
|
|
|
#include <version>
|
|
#ifdef __cpp_lib_ranges_enumerate
|
|
#include <ranges>
|
|
namespace rv = std::views;
|
|
namespace rs = std::ranges;
|
|
#endif
|
|
|
|
#pragma GCC optimize("O2,unroll-loops")
|
|
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
|
|
|
|
using namespace std;
|
|
|
|
using i16 = int16_t;
|
|
using u16 = uint16_t;
|
|
using i32 = int32_t;
|
|
using u32 = uint32_t;
|
|
using i64 = int64_t;
|
|
using u64 = uint64_t;
|
|
using f64 = double;
|
|
using f128 = long double;
|
|
|
|
#if __cplusplus >= 202002L
|
|
template <typename T> constexpr T MIN = std::numeric_limits<T>::min();
|
|
|
|
template <typename T> constexpr T MAX = std::numeric_limits<T>::max();
|
|
#endif
|
|
|
|
#ifdef LOCAL
|
|
#define db(...) std::print(__VA_ARGS__)
|
|
#define dbln(...) std::println(__VA_ARGS__)
|
|
#else
|
|
#define db(...)
|
|
#define dbln(...)
|
|
#endif
|
|
// }}}
|
|
|
|
void solve() {
|
|
u32 n, m;
|
|
cin >> n >> m;
|
|
vector<pair<u32, u32>> a(n);
|
|
for (auto &e : a) {
|
|
cin >> e.first >> e.second;
|
|
}
|
|
sort(begin(a), end(a));
|
|
u32 j = 0;
|
|
vector<u32> ans;
|
|
for (u32 i = 1; i <= m; ++i) {
|
|
while (i > a[j].second) {
|
|
++j;
|
|
}
|
|
if (j == n || i < a[j].first || i > a[j].second) {
|
|
ans.push_back(i);
|
|
}
|
|
}
|
|
println("{}", ans.size());
|
|
for (auto &e : ans)
|
|
print("{} ", e);
|
|
println();
|
|
}
|
|
|
|
int main() { // {{{
|
|
std::cin.exceptions(std::cin.failbit);
|
|
#ifdef LOCAL
|
|
std::cerr.rdbuf(std::cout.rdbuf());
|
|
std::cout.setf(std::ios::unitbuf);
|
|
std::cerr.setf(std::ios::unitbuf);
|
|
#else
|
|
std::cin.tie(nullptr)->sync_with_stdio(false);
|
|
#endif
|
|
u32 tc = 1;
|
|
for (u32 t = 0; t < tc; ++t) {
|
|
solve();
|
|
}
|
|
return 0;
|
|
}
|
|
// }}}
|