266(A,cpp): solve “Stones on the Table”

Signed-off-by: Matej Focko <me@mfocko.xyz>

266/a.cpp

@@ -0,0 +1,68 @@
+#include <iostream>
+#include <string>
+
+namespace {
+
+using namespace std;
+
+int remove(const std::string& s) {
+  int counter = 0;
+
+  for (auto i = 0; i < s.size() - 1; ++i) {
+    if (s[i] == s[i + 1]) {
+      ++counter;
+    }
+  }
+
+  return counter;
+}
+
+void solve() {
+  int size;
+  cin >> size;
+
+  std::string line;
+  cin >> line;
+
+  cout << remove(line) << "\n";
+}
+
+}  // namespace
+
+// for single test case, comment out for ‹N› test cases
+#define SINGLE
+
+#ifndef TEST
+
+int main(void) {
+
+#ifdef SINGLE
+
+  solve();
+
+#else
+
+  // for multiple test cases
+  int N;
+  std::cin >> N >> std::ws;
+
+  for (auto i = 0; i < N; ++i) {
+    solve();
+  }
+
+#endif
+
+  return 0;
+}
+
+#else
+
+#include "../.common/cpp/catch_amalgamated.hpp"
+
+TEST_CASE("examples") {
+  CHECK(remove(std::string("RRG")) == 1);
+  CHECK(remove(std::string("RRRRR")) == 4);
+  CHECK(remove(std::string("BRBG")) == 0);
+}
+
+#endif