Adding medium/hard puzzles & challenges...

puzzles/medium/conway-sequence.cpp

@@ -0,0 +1,69 @@
+// https://www.codingame.com/ide/puzzle/conway-sequence
+// Xavier Morel - 2016-03-23
+
+#include <iostream>
+#include <string>
+#include <vector>
+#include <algorithm>
+
+using namespace std;
+
+vector<int> line;
+
+
+void computeNextLine()
+{
+    vector<int> next;
+
+    int curNb = 0;
+    int qty = 0;
+
+    for (int n : line) {
+        if (curNb != n) {
+            if (curNb != 0) {
+                next.push_back(qty);
+                next.push_back(curNb);
+            }
+            curNb = n;
+            qty = 1;
+        } else {
+            qty++;
+        }
+    }
+
+    if (curNb != 0) {
+        next.push_back(qty);
+        next.push_back(curNb);
+    }
+
+    line = next;
+}
+
+void printLine(ostream& out)
+{
+    bool first = true;
+    for (int n : line) {
+        if (first == false) {
+            out << " ";
+        }
+        out << n;
+        first = false;
+    }
+    out << endl;
+}
+
+int main()
+{
+    int R;
+    cin >> R; cin.ignore();
+    int L;
+    cin >> L; cin.ignore();
+
+    line.push_back(R);
+
+    for (int i = 1; i < L; i++) {
+        printLine(cerr);
+        computeNextLine();
+    }
+    printLine(cout);
+}