Init

ACMOJ-1729.hpp

@@ -0,0 +1,60 @@
+#include <algorithm>
+#include <cstring>
+using namespace std;
+
+void Init(char **&p, int n) {  // 初始化，n为string的个数,传入的p指向nullptr
+  // todo
+  p = new char *[n + 1];
+  p[0] = reinterpret_cast<char *>(new int[n + 1]);
+  for (int i = 1; i <= n; i++) reinterpret_cast<int *>(p[0])[i] = 0;
+  reinterpret_cast<int *>(p[0])[0] = n;
+  for (int i = 1; i <= n; i++) {
+    p[i] = new char[1];
+    p[i][0] = 0;
+  }
+}
+void Assign_String(char **&p, int x,
+                   std::string str) {  // 将str赋值给第x个string
+  // todo
+  delete[] p[x];
+  reinterpret_cast<int *>(p[0])[x] = str.length();
+  char *new_p = new char[str.length() + 1];
+  memcpy(new_p, str.c_str(), str.length() + 1);
+  p[x] = new_p;
+}
+void Merge_String(
+    char **&p, int x, int y,
+    int z) {  // 把第y个string拼接到第x个string后面，赋给第z个string(x,y,z互不相等)
+              // (第x和y个string不变)
+  // todo
+  reinterpret_cast<int *>(p[0])[z] =
+      reinterpret_cast<int *>(p[0])[x] + reinterpret_cast<int *>(p[0])[y];
+  delete[] p[z];
+  p[z] = new char[reinterpret_cast<int *>(p[0])[z] + 1];
+  memcpy(p[z], p[x], reinterpret_cast<int *>(p[0])[x]);
+  memcpy(p[z] + reinterpret_cast<int *>(p[0])[x], p[y],
+         reinterpret_cast<int *>(p[0])[y]);
+  p[z][reinterpret_cast<int *>(p[0])[z]] = 0;
+}
+void Double_String(
+    char **&p, int x) {  // 把第x个string复制两遍前后拼接起来，再赋给第x个string
+  // todo
+  char *new_p = new char[reinterpret_cast<int *>(p[0])[x] * 2 + 1];
+  memcpy(new_p, p[x], reinterpret_cast<int *>(p[0])[x]);
+  memcpy(new_p + reinterpret_cast<int *>(p[0])[x], p[x],
+         reinterpret_cast<int *>(p[0])[x]);
+  reinterpret_cast<int *>(p[0])[x] *= 2;
+  delete[] p[x];
+  p[x] = new_p;
+  p[x][reinterpret_cast<int *>(p[0])[x]] = 0;
+}
+char *Get_String(char **&p, int x) {  // 返回第x个string
+  // todo
+  return p[x];
+}
+void Clear(char **&p, int n) {  // 回收空间
+  // todo
+  for (int i = 1; i <= n; i++) delete[] p[i];
+  delete[] (reinterpret_cast<int *>(p[0]));
+  delete[] p;
+}