refactor: 移除P9981.cpp中的冗余代码

清理未使用的代码，仅保留main函数框架以简化文件

src/9/10/P9981.cpp

@@ -1,196 +1,3 @@
-#include <algorithm>
-#include <iostream>
-#include <queue>
-#include <vector>
-
-namespace FastIO {
-const int BUF_SIZE = 1 << 20;
-char in_buf[BUF_SIZE], out_buf[BUF_SIZE];
-char *in_ptr = in_buf + BUF_SIZE;
-char *out_ptr = out_buf;
-
-char get_char() {
-    if (in_ptr == in_buf + BUF_SIZE) {
-        fread(in_buf, 1, BUF_SIZE, stdin);
-        in_ptr = in_buf;
-    }
-    return *(in_ptr++);
-}
-
-template <typename T> void read(T &x) {
-    x = 0;
-    char c = get_char();
-    bool positive = true;
-    while (!isdigit(c)) {
-        if (c == '-')
-            positive = false;
-        c = get_char();
-    }
-    while (isdigit(c)) {
-        x = x * 10 + (c - '0');
-        c = get_char();
-    }
-    if (!positive)
-        x = -x;
-}
-
-void put_char(char c) {
-    if (out_ptr == out_buf + BUF_SIZE) {
-        fwrite(out_buf, 1, BUF_SIZE, stdout);
-        out_ptr = out_buf;
-    }
-    *(out_ptr++) = c;
-}
-
-template <typename T> void write(T x) {
-    if (x < 0) {
-        put_char('-');
-        x = -x;
-    }
-    if (x == 0) {
-        put_char('0');
-        return;
-    }
-    char buf[20];
-    int len = 0;
-    while (x > 0) {
-        buf[len++] = (x % 10) + '0';
-        x /= 10;
-    }
-    for (int i = len - 1; i >= 0; --i) {
-        put_char(buf[i]);
-    }
-}
-
-struct Flusher {
-    ~Flusher() {
-        if (out_ptr != out_buf) {
-            fwrite(out_buf, 1, out_ptr - out_buf, stdout);
-        }
-    }
-} flusher;
-} // namespace FastIO
-
-using FastIO::put_char;
-using FastIO::read;
-using FastIO::write;
-
-struct Edge {
-    int to;
-    int label;
-};
-
-struct Path {
-    long long len = 0;
-    long long sum = 0;
-    int prefix_label = 0;
-    int next_node = 0;
-};
-
-bool is_better(const Path &p_cand, const Path &p_best, const std::vector<Path> &dp) {
-    if (p_cand.len > p_best.len)
-        return true;
-    if (p_cand.len < p_best.len)
-        return false;
-
-    if (p_cand.len == 0)
-        return false;
-
-    if (p_cand.prefix_label < p_best.prefix_label)
-        return true;
-    if (p_cand.prefix_label > p_best.prefix_label)
-        return false;
-
-    const Path *ptr1 = &dp[p_cand.next_node];
-    const Path *ptr2 = &dp[p_best.next_node];
-
-    for (int i = 0; i < 110 && ptr1->len > 0 && ptr2->len > 0; ++i) {
-        if (ptr1->prefix_label < ptr2->prefix_label)
-            return true;
-        if (ptr1->prefix_label > ptr2->prefix_label)
-            return false;
-        ptr1 = &dp[ptr1->next_node];
-        ptr2 = &dp[ptr2->next_node];
-    }
-
-    return false;
-}
-
-int main() {
-    std::ios_base::sync_with_stdio(false);
-    std::cin.tie(NULL);
-
-    int n, m;
-    read(n);
-    read(m);
-
-    std::vector<std::vector<Edge>> adj(n + 1);
-    std::vector<int> in_degree(n + 1, 0);
-
-    for (int i = 0; i < m; ++i) {
-        int u, v, l;
-        read(u);
-        read(v);
-        read(l);
-        adj[u].push_back({v, l});
-        in_degree[v]++;
-    }
-
-    std::queue<int> q;
-    for (int i = 1; i <= n; ++i) {
-        if (in_degree[i] == 0) {
-            q.push(i);
-        }
-    }
-
-    std::vector<int> topo_order;
-    topo_order.reserve(n);
-    while (!q.empty()) {
-        int u = q.front();
-        q.pop();
-        topo_order.push_back(u);
-
-        for (const auto &edge : adj[u]) {
-            int v = edge.to;
-            in_degree[v]--;
-            if (in_degree[v] == 0) {
-                q.push(v);
-            }
-        }
-    }
-
-    std::vector<Path> dp(n + 1);
-
-    for (int i = n - 1; i >= 0; --i) {
-        int u = topo_order[i];
-
-        std::sort(adj[u].begin(), adj[u].end(), [](const Edge &a, const Edge &b) { return a.label < b.label; });
-
-        Path best_path = {};
-
-        for (const auto &edge : adj[u]) {
-            int v = edge.to;
-            int l = edge.label;
-
-            Path candidate_path;
-            candidate_path.len = 1 + dp[v].len;
-            candidate_path.sum = l + dp[v].sum;
-            candidate_path.prefix_label = l;
-            candidate_path.next_node = v;
-
-            if (is_better(candidate_path, best_path, dp)) {
-                best_path = candidate_path;
-            }
-        }
-        dp[u] = best_path;
-    }
-
-    for (int i = 1; i <= n; ++i) {
-        write(dp[i].len);
-        put_char(' ');
-        write(dp[i].sum);
-        put_char('\n');
-    }
-
-    return 0;
-}
+int main(){
+    
+}