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33 lines
904 B
C++
33 lines
904 B
C++
#define _CRT_SECURE_NO_WARNINGS
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#define _SILENCE_CXX17_C_HEADER_DEPRECATION_WARNING
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#include <bits/stdc++.h>
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using namespace std;
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const int N = 100100;
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pair<int, int> a[N], b[N];
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int main()
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{
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multiset<int> s;
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int T, n;
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scanf("%d", &T);
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while (T--)
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{
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s.clear();
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scanf("%d", &n);
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for (int i = 0; i < n; i++)
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scanf("%d%d", &a[i].first, &a[i].second);
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for (int i = 0; i < n; i++)
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scanf("%d%d", &b[i].first, &b[i].second);
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sort(a, a + n), sort(b, b + n);
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int cnt = 0;
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for (int i = 0, j = 0; i < n; i++)
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{
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while (j < n && a[i].first >= b[j].first)
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s.insert(b[j++].second);
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auto ite = s.upper_bound(a[i].second);
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if (ite != s.begin()) s.erase(--ite), cnt++;
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}
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printf("%d\n", cnt);
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}
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return 0;
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}
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