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3 Commits
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d47e857941
Author | SHA1 | Date | |
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d47e857941 | |||
2519ed3a95 | |||
1104a5b26c |
134
S2OJ/1494/1494.cpp
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134
S2OJ/1494/1494.cpp
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#include <iostream>
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#include <algorithm>
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#include <limits>
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#include <queue>
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#include <tuple>
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#include <vector>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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const int N = 1e6 + 5;
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int n, s, t, f[N], ans;
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std::tuple<int, int, int> points[N];
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int idx, head[N << 1], ver[N << 2], edge[N << 2], next[N << 2];
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int cur[N << 1], dist[N << 1];
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void add(int u, int v, int w) {
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next[idx] = head[u];
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ver[idx] = v;
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edge[idx] = w;
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head[u] = idx++;
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}
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bool bfs() {
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std::fill_n(dist, N << 1, 0);
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std::queue<int> q;
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q.push(s);
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dist[s] = 1;
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cur[s] = head[s];
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while (!q.empty()) {
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int u = q.front();
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q.pop();
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for (int i = head[u]; ~i; i = next[i]) {
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int v = ver[i],
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w = edge[i];
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if (w && !dist[v]) {
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dist[v] = dist[u] + 1;
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cur[v] = head[v];
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if (v == t) return true;
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q.push(v);
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}
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}
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}
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return false;
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}
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int dinic(int u, int limit) {
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if (u == t) return limit;
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int flow = 0;
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for (int i = cur[u]; ~i && flow < limit; i = next[i]) {
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cur[u] = i;
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int v = ver[i],
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w = edge[i];
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if (dist[v] == dist[u] + 1 && w) {
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int k = dinic(v, std::min(w, limit - flow));
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if (!k) {
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dist[v] = 0;
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} else {
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flow += k;
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edge[i] -= k;
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edge[i ^ 1] += k;
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}
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}
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}
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return flow;
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}
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int main() {
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std::ios::sync_with_stdio(false);
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cin.tie(nullptr);
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std::fill_n(head, N << 1, -1);
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cin >> n;
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for (int i = 1; i <= n; i++) {
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cin >> std::get<0>(points[i]) >> std::get<1>(points[i]) >> std::get<2>(points[i]);
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}
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std::sort(points + 1, points + 1 + n);
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for (int i = 1; i <= n; i++) {
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f[i] = 1;
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for (int j = 1; j < i; j++) {
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int x1, y1, z1,
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x2, y2, z2;
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std::tie(x1, y1, z1) = points[i];
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std::tie(x2, y2, z2) = points[j];
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if (x2 < x1 && y2 < y1 && z2 < z1) {
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f[i] = std::max(f[i], f[j] + 1);
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add(j, i + n, 1);
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add(i + n, j, 0);
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}
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}
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ans = std::max(ans, f[i]);
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}
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s = n * 2 + 1, t = s + 1;
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for (int i = 1; i <= n; i++) {
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add(s, i, 1);
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add(i, s, 0);
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add(i + n, t, 1);
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add(t, i + n, 0);
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}
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int res = 0, flow;
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while (bfs()) {
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while (flow = dinic(s, std::numeric_limits<int>::max())) res += flow;
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}
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cout << ans << endl
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<< n - res << endl;
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return 0;
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}
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106
S2OJ/1496/1496.cpp
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S2OJ/1496/1496.cpp
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#include <iostream>
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#include <algorithm>
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#include <string>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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const int N = 15;
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int n, t, a[N << 2], b[N << 2];
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bool check() {
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int cnt = 0;
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for (int i = 1; i <= 27; i++) {
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if (b[i] < 0) return false;
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if (b[i] >= 3) {
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b[i] -= 3;
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cnt++;
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}
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if (i % 9 == 0 || i % 9 == 8) continue;
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while (b[i] > 0) {
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b[i]--, b[i + 1]--, b[i + 2]--;
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cnt++;
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}
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}
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return cnt == 4;
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}
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bool check_hu() {
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bool flag = false;
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for (int i = 1; i <= 27; i++) {
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if (a[i] >= 2) flag = true;
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}
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if (!flag) return false;
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for (int i = 1; i <= 27; i++) {
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if (a[i] < 2) continue;
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std::copy_n(a, N << 2, b);
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b[i] -= 2;
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if (check()) return true;
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}
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return false;
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}
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int main() {
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std::ios::sync_with_stdio(false);
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cin.tie(nullptr);
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cin >> n >> t;
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while (t--) {
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std::fill_n(a, N << 2, 0);
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for (int i = 1; i <= n; i++) {
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std::string s;
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cin >> s;
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int x = s[0] - '0';
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char c = s[1];
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if (c == 'p') x += 9;
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else if (c == 's') x += 18;
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a[x]++;
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}
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if (n == 14) {
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cout << check_hu() << endl;
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} else { // n == 13
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for (int i = 1; i <= 27; i++) {
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if (a[i] < 4) {
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a[i]++;
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if (check_hu()) {
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cout << (i - 1) % 9 + 1;
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if (1 <= i && i <= 9) {
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cout << "m ";
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} else if (10 <= i && i <= 18) {
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cout << "p ";
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} else { // 19 <= i && i <= 27
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cout << "s ";
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}
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}
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a[i]--;
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}
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}
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cout << endl;
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}
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}
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return 0;
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}
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S2OJ/1496/data/data5.out
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37
utils/graph.h
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37
utils/graph.h
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@ -0,0 +1,37 @@
|
||||
#include <tuple>
|
||||
#include <vector>
|
||||
|
||||
template <typename T>
|
||||
class Graph {
|
||||
private:
|
||||
// Indexes of the first edge of each vertex.
|
||||
std::vector<std::size_t> head;
|
||||
|
||||
// Edges of the graph.
|
||||
// Elements in a std::tuple are <to, weight, next>
|
||||
std::vector<std::tuple<std::size_t, T, std::size_t>> edge;
|
||||
|
||||
public:
|
||||
Graph() = default;
|
||||
|
||||
Graph(const int &_n)
|
||||
: head(n, -1) {}
|
||||
|
||||
// Add an edge from u to v with weight w.
|
||||
void add(const std::size_t &_u, const std::size_t &_v, const T &_w) {
|
||||
edge.emplace_back(_v, _w, head[_u]);
|
||||
head[_u] = edge.size() - 1;
|
||||
}
|
||||
|
||||
// Add an undirected edge from u to v with weight `w`.
|
||||
void add_undirected(const std::size_t &_u, const std::size_t &_v, const T &_w) {
|
||||
add(_u, _v, _w);
|
||||
add(_v, _u, _w);
|
||||
}
|
||||
|
||||
// Add an undirected edge from u to v with weight `w`, specifies the weight `rw` of reverse edge.
|
||||
void add_undirected(const std::size_t &_u, const std::size_t &_v, const T &_w, const T &_rw) {
|
||||
add(_u, _v, _w);
|
||||
add(_v, _u, _rw);
|
||||
}
|
||||
};
|
Loading…
Reference in New Issue
Block a user