docs: 添加仓库地址到README；chore: 整理实验分析；feat: Kruskal最小生成树与图存储结构

exercise/7.c

@@ -0,0 +1,36 @@
+#include <stdio.h>
+
+int main()
+{
+    int N;
+    scanf("%d", &N);
+    
+    while (N--)
+    {
+        int AH, AM, AS, BH, BM, BS;
+        scanf("%d %d %d %d %d %d", &AH, &AM, &AS, &BH, &BM, &BS);
+        
+        // 直接相加
+        int total_hours = AH + BH;
+        int total_minutes = AM + BM;
+        int total_seconds = AS + BS;
+        
+        // 处理秒的进位
+        if (total_seconds >= 60)
+        {
+            total_minutes += total_seconds / 60;
+            total_seconds = total_seconds % 60;
+        }
+        
+        // 处理分钟的进位
+        if (total_minutes >= 60)
+        {
+            total_hours += total_minutes / 60;
+            total_minutes = total_minutes % 60;
+        }
+        
+        printf("%d %d %d\n", total_hours, total_minutes, total_seconds);
+    }
+    
+    return 0;
+}