GH-42: Solve codeforces 282A (#91)

Author: rain1024

problems/codeforces282A/.gitginore

@@ -0,0 +1 @@
+solution

problems/codeforces282A/README.md

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+# Problem 
+
+## Usage
+
+Run program with an example
+
+```
+bazel run src/main:solution < tests/data/1.in
+```
+
+Test program
+
+```
+# Run all tests
+bazel test --test_output=all tests:solution_test
+bazel test --test_output=all --cache_test_results=no tests:solution_test
+# Run test with pecific test id
+bazel test --test_output=all tests:solution_test --test_arg=1
+```

problems/codeforces282A/run_tests.sh

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+for f in $(cd tests/; ls *.in); do
+  test_id=$(echo $f | cut -d'.' -f1)
+  ./solution < tests/$test_id.in | diff -aur tests/$test_id.out -
+done

problems/codeforces282A/src/main/BUILD

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+load("@rules_cc//cc:defs.bzl", "cc_binary")
+
+cc_binary(
+    name = "solution",
+    srcs = ["solution.cpp"],
+    visibility = ["//visibility:public"],
+)

problems/codeforces282A/src/main/solution.cpp

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+#include <cmath>
+#include <vector>
+#include <map>
+#include <algorithm>
+#include <string>
+#include <iostream>
+
+using namespace std;
+
+int main(){
+  ios::sync_with_stdio(false);
+  cin.tie(0);
+  int tt;
+  int x = 0;
+  cin >> tt;
+  string s;
+  while(tt--){
+    cin >> s;
+    if(s[1] == '+'){
+      x++;
+    } else {
+      x--;
+    }
+  }
+  cout << x << endl;
+  return 0;
+}

problems/codeforces282A/tests/BUILD

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+load("@rules_cc//cc:defs.bzl", "cc_binary", "cc_test")
+
+cc_test(
+    name = "solution_test",
+    srcs = ["solution_test.cpp"],
+    deps = [
+      "//problems/codeforces282A/src/main:solution",
+      "@com_google_googletest//:gtest_main",
+    ],
+    data = ["data"]
+)

problems/codeforces282A/tests/data/1.in

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+1
+++X

problems/codeforces282A/tests/data/1.out

@@ -0,0 +1 @@
+1

problems/codeforces282A/tests/data/2.in

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+2
+X++
+--X

problems/codeforces282A/tests/data/2.out

@@ -0,0 +1 @@
+0

problems/codeforces282A/tests/solution_test.cpp

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+#include <cstdlib>
+#include <filesystem>
+#include <fstream>
+#include <iostream>
+#include <string>
+#include <string_view>
+#include <vector>
+
+#include "gtest/gtest.h"
+
+namespace fs = std::filesystem;
+
+using namespace std;
+
+std::string TEST_ID = "";
+
+vector<string> split(string s, string delimiter) {
+  size_t pos_start = 0, pos_end, delim_len = delimiter.length();
+  string token;
+  vector<string> res;
+
+  while ((pos_end = s.find(delimiter, pos_start)) != string::npos) {
+    token = s.substr(pos_start, pos_end - pos_start);
+    pos_start = pos_end + delim_len;
+    res.push_back(token);
+  }
+
+  res.push_back(s.substr(pos_start));
+  return res;
+}
+
+std::string GetHello(std::string_view in) {
+  if (in.size() == 0) {
+    return std::string("hello, word");
+  } else {
+    return std::string("Hello, ") + in.data();
+  }
+}
+
+string ReadFile(const std::string &filename) {
+  std::ifstream f(filename);
+  string s((std::istreambuf_iterator<char>(f)),
+           std::istreambuf_iterator<char>());
+  return s;
+}
+
+vector<string> RunProgram(string fileid) {
+  vector<string> v;
+  string program = "problems/codeforces282A/src/main/solution";
+  string test_folder = "problems/codeforces282A/tests/data/";
+  string command = program + " < " + test_folder + fileid + ".in > output.txt";
+  std::system(command.c_str());
+  string actual = ReadFile("output.txt");
+  string expectedOutputFile = test_folder + fileid + ".out";
+  string expected = ReadFile(expectedOutputFile);
+  v.push_back(actual);
+  v.push_back(expected);
+  return v;
+}
+
+TEST(RunTest, AllTestCases) {
+  if (TEST_ID != "") {
+    std::cout << "TEST_ID = " << TEST_ID << std::endl;
+  } else {
+    std::cout << "RUN ALL TESTS" << std::endl;
+  }
+
+  std::string test_data_folder = "problems/codeforces282A/tests/data";
+  for (const auto &entry : fs::directory_iterator(test_data_folder)) {
+    string filename = split(entry.path(), "/").back();
+    vector<string> v = split(filename, ".");
+    string fileid = v[0];
+    string extension = v[1];
+    if (extension != "in"){
+      continue;
+    }
+    if (TEST_ID != ""){
+      if (fileid != TEST_ID){
+        continue;
+      }
+    }
+    // Run Test Case
+    vector<string> output = RunProgram(fileid);
+    string actual = output[0];
+    string expected = output[1];
+    string message = "❌ FAIL CASE: " + fileid;
+    ASSERT_EQ(actual, expected) << message;
+  }
+}
+
+int main(int argc, char **argv) {
+  ::testing::InitGoogleTest(&argc, argv);
+  if (argc == 2) {
+    TEST_ID = argv[1];
+  }
+  return RUN_ALL_TESTS();
+}