diff --git a/homework/11956.c b/homework/11956.c
new file mode 100644
index 0000000..714bbdb
--- /dev/null
+++ b/homework/11956.c
@@ -0,0 +1,88 @@
+#include <stdio.h>
+#include <string.h>
+#define MIN(i, j) (((i) < (j)) ? (i) : (j))
+
+struct student {
+    int id, c;
+    float x, y, z;
+    float sum;
+    char name[233];
+} stu[4];
+
+int cmp(char s1[], char s2[]) {
+    int l1 = strlen(s1), l2 = strlen(s2);
+    for (int i = 0; i < MIN(l1, l2); i++) {
+        if (s1[i] > s2[i])
+            return 1;
+        else if (s1[i] < s2[i])
+            return -1;
+    }
+    if (l1 == l2)
+        return 0;
+    else if (l1 > l2)
+        return 1;
+    else
+        return -1;
+}
+
+void swap(struct student* a, struct student* b) {
+    struct student c;
+    c = *a;
+    *a = *b;
+    *b = c;
+}
+
+void sort() {
+    for (int i = 0; i < 4; i++) {
+        for (int j = 0; j < 4 - i - 1; j++) {
+            if (stu[j].c > stu[j + 1].c || (stu[j].c == stu[j + 1].c && cmp(stu[j].name, stu[j + 1].name) > 0)) {
+                swap(&stu[j], &stu[j + 1]);
+            }
+        }
+    }
+}
+
+float sum(int i) {
+    return stu[i].x + stu[i].y + stu[i].z;
+}
+
+int main() {
+    stu[0].c = 11;
+    stu[0].id = 1001;
+    stu[0].x = 92.5;
+    stu[0].y = 82.5;
+    stu[0].z = 96;
+    strcpy(stu[0].name, "Zhao");
+
+    stu[1].c = 12;
+    stu[1].id = 1002;
+    stu[1].x = 82.5;
+    stu[1].y = 87.5;
+    stu[1].z = 93.5;
+    strcpy(stu[1].name, "Qian");
+
+    stu[2].c = 13;
+    stu[2].id = 1003;
+    stu[2].x = 97;
+    stu[2].y = 84.5;
+    stu[2].z = 88.5;
+    strcpy(stu[2].name, "Sun");
+
+    stu[3].c = 12;
+    stu[3].id = 1004;
+    stu[3].x = 95.8;
+    stu[3].y = 85.6;
+    stu[3].z = 74.9;
+    strcpy(stu[3].name, "Li");
+
+    stu[0].sum = sum(0);
+    stu[1].sum = sum(1);
+    stu[2].sum = sum(2);
+    stu[3].sum = sum(3);
+
+    sort();
+
+    for (int i = 0; i < 4; i++)
+        printf("%d,%d,%s,%.1f,%.1f,%.1f,%.1f\n", stu[i].id, stu[i].c,stu[i].name, stu[i].x, stu[i].y, stu[i].z, stu[i].sum);
+    return 0;
+}
\ No newline at end of file
diff --git a/homework/11990.c b/homework/11990.c
new file mode 100644
index 0000000..f78bdc9
--- /dev/null
+++ b/homework/11990.c
@@ -0,0 +1,18 @@
+#include <stdio.h>
+
+int p[5];
+
+int sum(int* p, int n) {
+    int ans = 0;
+    for (int i = 0; i < n; i++) {
+        ans += p[i];
+    }
+    return ans;
+}
+
+int main() {
+    for (int i = 0; i < 5; i++) {
+        scanf("%d", &p[i]);
+    }
+    printf("%d", sum(p, 5));
+}
\ No newline at end of file