2048.cpp

puzzles/training/2048.cpp

@@ -0,0 +1,71 @@
+/*
+VIM: let b:cf5build="clang -std=c++20 -O2 -pthread -lstdc++ -I. {SRC} -o {OUT}"
+VIM: let b:cf5run="{OUT}"
+*/
+#include <iostream>
+#include <exception>
+#include <chrono>
+#include <vector>
+
+void print(const std::vector<int>& row)
+{
+    for (auto i : row){
+        std::cout << i << ',';
+    }
+    std::cout << std::endl;
+}
+
+void push(std::vector<int> row)
+{
+    print(row);
+    auto q = row.begin();
+    auto pe = row.end();
+    for (auto p = row.begin()+1; p != pe; ++p){
+        if (*p==0){
+            continue;
+        }
+        else if (*q == 0){
+            *q+=*p;
+            *p = 0;
+        }
+        else if (*q == *p){
+            *q+=*p;
+            *p = 0;
+            ++q;
+        }
+        else {
+            *++q = *p;
+            if (*q != *p){
+                *p = 0;
+            }
+        }
+    }
+    print(row);
+}
+
+int main ( void )
+{try{
+    auto begin = std::chrono::high_resolution_clock::now();
+
+    push({4, 0, 4, 8});
+
+    //......
+
+    auto end = std::chrono::high_resolution_clock::now();
+    std::chrono::duration<double> seconds = end - begin;
+    std::cout << "Time: " << seconds.count() << std::endl;
+    return 0;
+}
+catch ( const std::exception& e )
+{
+    std::cerr << std::endl
+            << "std::exception(\"" << e.what() << "\")." << std::endl;
+    return 2;
+}
+catch ( ... )
+{
+    std::cerr  << std::endl
+            << "unknown exception." << std::endl;
+    return 1;
+}}
+