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C++/files/pert.cpp

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+//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD>.
+#include <iostream>
+#include <fstream>
+#include <cmath>
+
+using namespace std;
+
+int main() {
+	int n;
+	double r,pi,a1,b1,per,a2,b2,a,b;
+	per=0;
+	ifstream d;
+	d.open ("input.txt");
+	d>>n;
+	d>>r;
+	d>>a1;
+	d>>b1;
+	a=a1;
+	b=b1;
+	while (!d.eof()) {
+		d>>a2;
+		d>>b2;
+		per=per+(sqrt((a2-a1)*(a2-a1)+(b2-b1)*(b2-b1)));
+		a1=a2; b1=b2;
+	}
+	per=per+sqrt((a1-a)*(a1-a)+(b1-b)*(b1-b)+(a2-a1)*(a2-a1)+(b2-b1)*(b2-b1));
+	per=per+((2*3.14*r)/4)*n;
+	d.close();
+	ofstream f;
+	f.open ("output.txt");
+	f<<per;
+	f.close();
+    return 0;
+}