Create 1008.cpp

QUSTOJ/1008.cpp

@@ -0,0 +1,74 @@
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <cmath>
+
+using namespace std;
+
+const double PI=3.1415926;
+
+typedef struct
+{
+    double x,y;
+    int vis;
+}point_struct;
+
+point_struct point[105];
+
+int main()
+{
+    //Initialize
+    memset(point,0,sizeof(point_struct)*105);
+    double r;
+    double line_length=0;
+    int n;
+    //Input
+    scanf("%d %lf",&n,&r);
+    for(int i=0;i<n;i++)
+    {
+        scanf("%lf %lf",&point[i].x,&point[i].y);
+    }
+    //Now start with the first point, currently : All of point.vis is 0 (false)
+    //At first we need some value to save states.
+    int isfirst=1;//It's the first point
+    double min_distance;
+    int min_distance_point;
+    int checked_point=0;
+    int checking_point=0;
+    while(checked_point<n-1)
+    {
+        //Now is checking "checking_point"
+        isfirst=1;
+        for(int i=0;i<n;i++)
+        {
+            if(point[i].vis||i==checking_point)
+            {
+                continue;
+            }
+            if(isfirst)
+            {
+                isfirst=0;
+                min_distance=sqrt((point[checking_point].x-point[i].x)*(point[checking_point].x-point[i].x)+(point[checking_point].y-point[i].y)*(point[checking_point].y-point[i].y));
+                min_distance_point=i;
+            }
+            else
+            {
+                double this_distance=sqrt((point[checking_point].x-point[i].x)*(point[checking_point].x-point[i].x)+(point[checking_point].y-point[i].y)*(point[checking_point].y-point[i].y));
+                if(min_distance>this_distance)
+                {
+                    min_distance=this_distance;
+                    min_distance_point=i;
+                }
+            }
+        }
+        point[checking_point].vis=1;
+        line_length+=min_distance;
+        checking_point=min_distance_point;
+        checked_point++;
+    }
+    double final_distance=sqrt((point[checking_point].x-point[0].x)*(point[checking_point].x-point[0].x)+(point[checking_point].y-point[0].y)*(point[checking_point].y-point[0].y));
+    line_length+=final_distance;
+    line_length+=2*PI*r;
+    printf("%.2lf\n",line_length);
+    return 0;
+}