GH-140: Solve leetcode 238 (#185)

Author: rain1024

collections/leetcode/README.md

@@ -269,7 +269,7 @@
 <td>235</td>
 <td>236</td>
 <td>237</td>
-<td>238</td>
+<td>🟡&nbsp;<a href='https://github.com/rain1024/datastructures-algorithms-competitive-programming/tree/main/problems/leetcode238'>238</a></td>
 <td>239</td>
 <td>240</td>
 <tr>

collections/leetcode/data.yaml

@@ -29,6 +29,9 @@ problems:
 - name: 217
   languages: cpp
   level: easy
+- name: 238
+  languages: cpp
+  level: medium
 - name: 242
   languages: cpp
   level: easy

problems/leetcode238/.gitignore

@@ -0,0 +1,2 @@
+solution
+*.dSYM

problems/leetcode238/README.md

@@ -0,0 +1,19 @@
+# Leetcode Problem 
+
+## Usage
+
+Run program with an example
+
+```
+bazel run cpp/main:solution < 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/leetcode238/cpp/main/BUILD

@@ -0,0 +1,7 @@
+load("@rules_cc//cc:defs.bzl", "cc_binary")
+
+cc_binary(
+    name = "solution",
+    srcs = ["solution.cpp", "solution.h"],
+    visibility = ["//visibility:public"],
+)

problems/leetcode238/cpp/main/solution.cpp

@@ -0,0 +1,46 @@
+#include "solution.h"
+
+#include <algorithm>
+#include <cmath>
+#include <iostream>
+#include <map>
+#include <string>
+#include <vector>
+#include <fstream>
+
+using namespace std;
+
+int main() {
+  ios::sync_with_stdio(false);
+  cin.tie(0);
+
+  bool is_use_file = false;
+
+  filesystem::path filepath =
+      filesystem::current_path().parent_path().parent_path() / "data" / "1.in";
+  ifstream file(filepath);
+
+  if (is_use_file) {
+    cin.rdbuf(file.rdbuf());  // redirect cin to file
+  }
+
+  // get input
+  int x;
+  cin >> x;
+
+  vector<int> v(x);
+  for(int i=0; i<x; i++){
+    cin >> v[i];
+  }
+
+  Solution solution;
+  vector<int> output = solution.productExceptSelf(v);
+
+  // print output
+  for(auto item: output){
+    cout << item << " ";
+  }
+  cout << endl;
+
+  return 0;
+}

problems/leetcode238/cpp/main/solution.h

@@ -0,0 +1,39 @@
+#include <algorithm>
+#include <cmath>
+#include <map>
+#include <queue>
+#include <set>
+#include <stack>
+#include <string>
+#include <unordered_map>
+#include <vector>
+
+using namespace std;
+
+class Solution {
+ public:
+  vector<int> productExceptSelf(vector<int>& nums) {
+    int p = 1;
+    int zeros = 0;
+    for (auto num : nums) {
+      if (num != 0) {
+        p *= num;
+      } else {
+        zeros++;
+      }
+    }
+    vector<int> v;
+    for (auto num : nums) {
+      int val;
+      if (zeros > 1) {
+        val = 0;
+      } else if (zeros == 1) {
+        val = num != 0 ? 0 : p;
+      } else {
+        val = p / num;
+      }
+      v.push_back(val);
+    }
+    return v;
+  }
+};

problems/leetcode238/cpp/tests/BUILD

@@ -0,0 +1,11 @@
+load("@rules_cc//cc:defs.bzl", "cc_binary", "cc_test")
+
+cc_test(
+    name = "solution_test",
+    srcs = ["solution_test.cpp"],
+    deps = [
+      "//problems/codeforcesAA/src/main:solution",
+      "@com_google_googletest//:gtest_main",
+    ],
+    data = ["data"]
+)

problems/leetcode238/cpp/tests/solution_test.cpp

@@ -0,0 +1,97 @@
+#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/codeforcesAA/src/main/solution";
+  string test_folder = "problems/codeforcesAA/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/codeforcesAA/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();
+}

problems/leetcode238/data/1.in

@@ -0,0 +1,2 @@
+4
+1 2 3 4

problems/leetcode238/data/1.out

@@ -0,0 +1 @@
+24 12 8 6

problems/leetcode238/data/2.in

@@ -0,0 +1,2 @@
+5
+-1 1 0 -3 3

problems/leetcode238/data/2.out

@@ -0,0 +1 @@
+0 0 9 0 0

problems/leetcode238/problem_infos.json

@@ -0,0 +1,9 @@
+{
+  "name": "Leetcode 78. Subsets",
+  "link": "https://leetcode.com/problems/subsets/",
+  "tags": [
+    "Array",
+    "Backtracking",
+    "Bit Manipulation"
+  ]
+}