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33
S2OJ/1122/1122.cpp
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33
S2OJ/1122/1122.cpp
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#include <bits/stdc++.h>
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using namespace std;
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int n, m[2], a, b, cnt[2][100005], ans;
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set<pair<int, int>> s;
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int main() {
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cin >> n >> m[0] >> m[1];
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for (int k = 0; k < 2; k++) {
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for (int i = 1; i <= m[k]; i++) {
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cin >> a >> b;
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s.insert(make_pair(a, b));
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}
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for (int i = 1; i <= n; i++) {
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int p = 0, c = 0;
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while (true) {
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auto it = s.lower_bound(make_pair(p, 0));
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if (it == s.end()) break;
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p = it->second;
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s.erase(it);
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c++;
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}
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cnt[k][i] = cnt[k][i - 1] + c;
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}
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s.clear();
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}
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for (int i = 0; i <= n; i++) {
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ans = max(ans, cnt[0][i] + cnt[1][n - i]);
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}
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cout << ans << endl;
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return 0;
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}
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