create dev channel

zeta/c/completed/14425.c

@@ -0,0 +1,51 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int STR_LEN = 501;
+
+int comp(const void *a, const void *b) {
+    return strcmp((char *) a, (char *) b);
+}
+
+int is_in(char *a, char (*S)[STR_LEN], int N) {
+    // binary search
+    int low = 0, high = N - 1;
+    while (low <= high) {
+        int mid = (low + high) / 2;
+
+        int k = (int) strcmp(a, S[mid]);
+        if (k == 0) return 1;
+        else if (k < 0)
+            high = mid - 1;
+        else if (k > 0)
+            low = mid + 1;
+    }
+    return 0;
+}
+
+int main() {
+    int N, M;
+
+    scanf("%d %d", &N, &M);
+
+    char S[N][STR_LEN];
+    char check[M][STR_LEN];
+
+    for (int i = 0; i < N; i++) {
+        scanf("%s", (S[i]));
+    }
+
+    for (int i = 0; i < M; i++) {
+        scanf("%s", (check[i]));
+    }
+
+    qsort(S, N, sizeof(char) * 501, comp);
+
+    int count = 0;
+    for (int i = 0; i < M; i++) {
+        count += is_in((check[i]), S, N);
+    }
+    printf("%d\n", count);
+    return 0;
+}