diff --git a/【实践课外】7.数组1/7-12 数组-值钱的微信号.c b/【实践课外】7.数组1/7-12 数组-值钱的微信号.c
new file mode 100644
index 0000000..d1250d7
--- /dev/null
+++ b/【实践课外】7.数组1/7-12 数组-值钱的微信号.c	
@@ -0,0 +1,32 @@
+#include <stdio.h>
+
+int n, k, a[55], ans;
+
+int main() {
+    scanf("%d%d", &k, &n);
+
+    for (int i = 1; i <= n; i++) {
+        scanf("%d", &a[i]);
+    }
+
+    for (int i = 1; i <= n; i++) {
+        for (int j = 2; j <= n; j++) {
+            if (a[j] < a[j - 1]) {
+                int t = a[j];
+                a[j] = a[j - 1];
+                a[j - 1] = t;
+            }
+        }
+    }
+
+    for (int i = 1; i <= n; i++) {
+        if (k > a[i]) {
+            k -= a[i];
+            ans++;
+        }
+    }
+
+    printf("%d\n", ans);
+
+    return 0;
+}
diff --git a/【实践课外】7.数组1/7-12 数组-值钱的微信号.jpg b/【实践课外】7.数组1/7-12 数组-值钱的微信号.jpg
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diff --git a/【实践课外】7.数组1/7-14 数组-吹泡泡.c b/【实践课外】7.数组1/7-14 数组-吹泡泡.c
new file mode 100644
index 0000000..feca843
--- /dev/null
+++ b/【实践课外】7.数组1/7-14 数组-吹泡泡.c	
@@ -0,0 +1,40 @@
+#include <stdio.h>
+
+const double PI = 3.14;
+const double FDT = 1.33;
+
+int n, id[1005];
+double v[1005];
+
+int main() {
+    scanf("%d", &n);
+
+    for (int i = 1; i <= n; i++) {
+        double r;
+
+        scanf("%lf", &r);
+
+        v[i] = FDT * PI * r * r * r;
+        id[i] = i;
+    }
+
+    for (int i = 1; i <= n; i++) {
+        for (int j = 2; j <= n; j++) {
+            if (v[j] > v[j - 1] || (v[j] == v[j - 1] && id[j] < id[j - 1])) {
+                double t = v[j];
+                v[j] = v[j - 1];
+                v[j - 1] = t;
+
+                int tt = id[j];
+                id[j] = id[j - 1];
+                id[j - 1] = tt;
+            }
+        }
+    }
+
+    for (int i = 1; i <= n; i++) {
+        printf("%.2lf %d\n", v[i], id[i]);
+    }
+
+    return 0;
+}
diff --git a/【实践课外】7.数组1/7-14 数组-吹泡泡.jpg b/【实践课外】7.数组1/7-14 数组-吹泡泡.jpg
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diff --git a/【实践课外】7.数组1/7-19 数组-数学鬼才.c b/【实践课外】7.数组1/7-19 数组-数学鬼才.c
new file mode 100644
index 0000000..5f28f5c
--- /dev/null
+++ b/【实践课外】7.数组1/7-19 数组-数学鬼才.c	
@@ -0,0 +1,27 @@
+#include <stdio.h>
+
+int main() {
+    int q;
+
+    scanf("%d", &q);
+
+    while (q--) {
+        long long n;
+
+        scanf("%lld", &n);
+
+        if (n >= 2018) {
+            printf("0\n");
+        } else {
+            int ans = 1;
+
+            for (int i = 1; i <= n; i++) {
+                ans = (long long)ans * i % 2018;
+            }
+
+            printf("%d\n", ans);
+        }
+    }
+
+    return 0;
+}
diff --git a/【实践课外】7.数组1/7-19 数组-数学鬼才.jpg b/【实践课外】7.数组1/7-19 数组-数学鬼才.jpg
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index 0000000..3d327cc
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diff --git a/【实践课外】7.数组1/7-5 计算最大值出现的次数.c b/【实践课外】7.数组1/7-5 计算最大值出现的次数.c
new file mode 100644
index 0000000..c39c950
--- /dev/null
+++ b/【实践课外】7.数组1/7-5 计算最大值出现的次数.c	
@@ -0,0 +1,31 @@
+#include <stdio.h>
+
+int n, a[1005];
+
+int main() {
+    scanf("%d", &n);
+
+    for (int i = 1; i <= n; i++) {
+        scanf("%d", &a[i]);
+    }
+
+    int max = a[0];
+
+    for (int i = 2; i <= n; i++) {
+        if (a[i] > max) {
+            max = a[i];
+        }
+    }
+
+    int count = 0;
+
+    for (int i = 1; i <= n; i++) {
+        if (a[i] == max) {
+            count++;
+        }
+    }
+
+    printf("%d %d\n", max, count);
+
+    return 0;
+}
diff --git a/【实践课外】7.数组1/7-5 计算最大值出现的次数.jpg b/【实践课外】7.数组1/7-5 计算最大值出现的次数.jpg
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index 0000000..80cdd50
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diff --git a/【实践课外】7.数组1/7-6 求一批整数中出现最多的个位数字.c b/【实践课外】7.数组1/7-6 求一批整数中出现最多的个位数字.c
new file mode 100644
index 0000000..62bd5b8
--- /dev/null
+++ b/【实践课外】7.数组1/7-6 求一批整数中出现最多的个位数字.c	
@@ -0,0 +1,54 @@
+#include <stdio.h>
+
+int n, cnt[15];
+
+int main() {
+    scanf("%d", &n);
+
+    for (int i = 1; i <= n; i++) {
+        int x;
+
+        scanf("%d", &x);
+
+        if (x == 0) {
+            cnt[0]++;
+        } else {
+            while (x) {
+                cnt[x % 10]++;
+                x /= 10;
+            }
+        }
+    }
+
+    int max = 0;
+
+    for (int i = 0; i <= 9; i++) {
+        if (cnt[i] > max) {
+            max = cnt[i];
+        }
+    }
+
+    int max_cnt = 0, out_cnt = 0;
+
+    for (int i = 0; i <= 9; i++) {
+        if (cnt[i] == max) {
+            max_cnt++;
+        }
+    }
+
+    printf("%d: ", max);
+
+    for (int i = 0; i <= 9; i++) {
+        if (cnt[i] == max) {
+            out_cnt++;
+
+            if (out_cnt < max_cnt) {
+                printf("%d ", i);
+            } else {
+                printf("%d\n", i);
+            }
+        }
+    }
+
+    return 0;
+}
diff --git a/【实践课外】7.数组1/7-6 求一批整数中出现最多的个位数字.jpg b/【实践课外】7.数组1/7-6 求一批整数中出现最多的个位数字.jpg
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index 0000000..ffcda68
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diff --git a/【实践课外】7.数组1/7-7 装箱问题.c b/【实践课外】7.数组1/7-7 装箱问题.c
new file mode 100644
index 0000000..fc27b68
--- /dev/null
+++ b/【实践课外】7.数组1/7-7 装箱问题.c	
@@ -0,0 +1,27 @@
+#include <stdio.h>
+
+int n, box[1005];
+
+int main() {
+    scanf("%d", &n);
+
+    for (int i = 1; i <= n; i++) {
+        int x;
+
+        scanf("%d", &x);
+
+        for (int j = 1; j <= n; j++) {
+            if (box[j] + x <= 100) {
+                printf("%d %d\n", x, j);
+                box[j] += x;
+                break;
+            }
+        }
+    }
+
+    while (box[n] == 0) n--;
+
+    printf("%d\n", n);
+
+    return 0;
+}
diff --git a/【实践课外】7.数组1/7-7 装箱问题.jpg b/【实践课外】7.数组1/7-7 装箱问题.jpg
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index 0000000..c729dea
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