From feb2acf4d17abc35246310ad667d2892d51e906c Mon Sep 17 00:00:00 2001
From: juan <juancloudcomputing@protonmail.com>
Date: Wed, 2 Nov 2022 10:28:10 +0800
Subject: [PATCH] Add pset4

---
 semester3/pset4/7-3-航空公司VIP客户查询.c | 93 +++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 semester3/pset4/7-3-航空公司VIP客户查询.c

diff --git a/semester3/pset4/7-3-航空公司VIP客户查询.c b/semester3/pset4/7-3-航空公司VIP客户查询.c
new file mode 100644
index 0000000..633a72a
--- /dev/null
+++ b/semester3/pset4/7-3-航空公司VIP客户查询.c
@@ -0,0 +1,93 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#define SIZE 100023
+#define IDLEN 19
+#define P 13
+
+typedef struct hashtable {
+  int m;
+  int p;
+  char **key;
+  int *answer;
+} hashTable;
+
+hashTable *newHash() {
+  hashTable *h = malloc(sizeof(hashTable));
+  h->m = SIZE;
+  h->p = P;
+  h->key = malloc(sizeof(char *) * SIZE);
+  for (int i = 0; i < SIZE; i++) {
+    h->key[i] = malloc(sizeof(char) * IDLEN);
+    h->key[i][0] = '#';
+    h->key[i][1] = '\0';
+  }
+
+  h->answer = malloc(sizeof(int) * SIZE);
+  for (int i = 0; i < SIZE; i++) {
+    h->answer[i] = 0;
+  }
+
+  return h;
+}
+
+int hash(hashTable *h, char *str) {
+  int m = h->m;
+  int p = h->p;
+  int ans = 0;
+  int p_pow = 1;
+
+  for (int i = 0; i < IDLEN - 1; i++) {
+    if (str[i] == 'x') {
+      ans = (ans + 11 * p_pow) % m;
+    } else {
+      ans = (ans + (str[i] - '0' + 1) * p_pow) % m;
+    }
+    p_pow = (p_pow * p) % m;
+  }
+
+  int quad = 1;
+  while (h->key[ans][0] != '#' && strcmp(h->key[ans], str) != 0) {
+    // collision
+    ans = (ans + quad * quad) % m;
+    quad++;
+  }
+
+  return ans;
+}
+
+int max(int l, int r) { return (l > r) ? l : r; }
+
+int main(void) {
+  int n, k;
+  scanf("%d%d", &n, &k);
+
+  char buf[IDLEN];
+  int tmp;
+
+  hashTable *h = newHash();
+  int strHash;
+
+  for (int i = 0; i < n; i++) {
+    scanf("%s%d", buf, &tmp);
+
+    strHash = hash(h, buf);
+
+    strcpy(h->key[strHash], buf);
+    h->answer[strHash] += max(k, tmp);
+  }
+
+  scanf("%d", &n);
+
+  for (int i = 0; i < n; i++) {
+    scanf("%s", buf);
+    strHash = hash(h, buf);
+    if (h->key[strHash][0] == '#') {
+      printf("No Info\n");
+    } else {
+      printf("%d\n", h->answer[strHash]);
+    }
+  }
+
+  return 0;
+}