complete 7785.c and 7785.py

zeta_C/completed/7785.c

@@ -0,0 +1,40 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+typedef struct _Item {
+    char name[6];
+    char isin;
+} Item;
+
+int comp(const void *a, const void *b) {
+    int cmp = strcmp((*(Item *) a).name, (*(Item *) b).name);
+
+    return -cmp;
+}
+
+int main() {
+    int N;
+
+    scanf("%d", &N);
+    Item res[N + 1];
+    for (int i = 0; i < N; i++) {
+        char temp[6];
+        scanf("%s %s", res[i].name, temp);
+        if (temp[0] == 'e') {
+            res[i].isin = 1;
+        } else {
+            res[i].isin = 0;
+        }
+    }
+
+    qsort(res, N, sizeof(Item), comp);
+    for (int i = 0; i < N; i++) {
+        if (comp(&res[i], &res[i + 1]) == 0) {
+            i++;
+        } else {
+            printf("%s\n", res[i].name);
+        }
+    }
+    return 0;
+}