Add problems from CF

Author: jhonber

codeforces/Codeforces Round #388 (Div. 2)/A.cpp

@@ -0,0 +1,31 @@
+// http://codeforces.com/contest/749/problem/A
+
+#include<bits/stdc++.h>
+using namespace std;
+
+#define endl '\n'
+#define D(x) cout << #x << " = " << (x) << endl;
+
+int main() {
+  int n;
+  cin >> n;
+
+  int f = false;
+  int two = 0;
+  if (n % 2 == 0) {
+    two = n / 2;
+  }
+  else {
+    two = (n / 2) - 1;
+    f = true;
+  }
+
+  cout << two + f << endl;
+  for (int i = 0; i < two; ++i) {
+    cout << 2 << " ";
+  }
+
+  if (f) cout << 3 << endl;
+
+  return 0;
+}

codeforces/Codeforces Round #388 (Div. 2)/B.cpp

@@ -0,0 +1,44 @@
+#include<bits/stdc++.h>
+using namespace std;
+
+#define endl '\n'
+#define D(x) cout << #x << " = " << (x) << endl;
+
+struct point {
+  int x, y;
+  point () {}
+  point (int a, int b) {
+    x = a;
+    y = b;
+  }
+
+  point operator - (const point &other) const {
+    return point(x - other.x, y - other.y);
+  }
+
+  point operator + (const point &other) const {
+    return point(x + other.x, y + other.y);
+  }
+
+  void print () {
+    cout << x << " " << y << endl;
+  }
+};
+
+int main() {
+  int x1, y1, x2, y2, x3, y3;
+  cin >> x1 >> y1 >> x2 >> y2 >> x3 >> y3;
+
+  point a(x1, y1), b(x2, y2), c(x3, y3);
+
+  cout << 3 << endl;
+  point aa = a - b + c;
+  point bb = a - c + b;
+  point cc = c - a + b;
+
+  aa.print();
+  bb.print();
+  cc.print();
+
+  return 0;
+}

codeforces/data.db

@@ -925,4 +925,7 @@
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