diff --git a/zeta_C/completed/19637.c b/zeta_C/completed/19637.c
new file mode 100644
index 0000000..4920ab7
--- /dev/null
+++ b/zeta_C/completed/19637.c
@@ -0,0 +1,41 @@
+#include <stdbool.h>
+#include <stdio.h>
+
+typedef struct TitleCondition {
+    char title[12];
+    int condition;
+} TitleCondition;
+
+TitleCondition total[100000];
+int N, M;
+
+// tc[i-1] < x <= tc[i]일 때, tc[i]
+TitleCondition *get_title(int x) {
+    int start = -1, end = N;
+    int mid;
+
+    while (start + 1 < end) {
+        mid = (start + end) / 2;
+        if (total[mid].condition < x) {
+            start = mid;
+        } else {
+            end = mid;
+        }
+    }
+
+    return total + end;
+}
+
+int main() {
+    scanf("%d %d", &N, &M);
+    for (int i = 0; i < N; i++) {
+        scanf("%s %d", &total[i].title, &total[i].condition);
+    }
+    int temp;
+    for (int i = 0; i < M; i++) {
+        scanf("%d", &temp);
+        printf("%s\n", get_title(temp)->title);
+    }
+
+    return 0;
+}
\ No newline at end of file