diff --git a/src/languages/cpp.ts b/src/languages/cpp.ts
index b1b8020..9697590 100644
--- a/src/languages/cpp.ts
+++ b/src/languages/cpp.ts
@@ -10,7 +10,7 @@ export const lang = {
         // write a shell script or some other stuff, 
         // and put it to your sandbox.
         executable: "/usr/bin/g++",
-        parameters: ["g++", sourcePath, "-o", `${outputDirectory}/a.out`, "-O2", "-fdiagnostics-color=always", "-DONLINE_JUDGE", "-mx32"],
+        parameters: ["g++", sourcePath, "-o", `${outputDirectory}/a.out`, "-std=c++03", "-O2", "-fdiagnostics-color=always", "-DONLINE_JUDGE", "-mx32"],
         time: 5000,
         memory: 1024 * 1024 * 1024,
         process: 10,
diff --git a/src/languages/cpp17.ts b/src/languages/cpp17.ts
new file mode 100644
index 0000000..c0a8809
--- /dev/null
+++ b/src/languages/cpp17.ts
@@ -0,0 +1,47 @@
+export const lang =  {
+    name: "cpp17",
+    sourceFileName: "a.cpp",
+    fileExtension: "cpp",
+    binarySizeLimit: 5000 * 1024,
+
+    // Note that these two paths are in the sandboxed environment.
+    compile: (sourcePath, outputDirectory) => ({
+        // To customize the compilation process,
+        // write a shell script or some other stuff, 
+        // and put it to your sandbox.
+        executable: "/usr/bin/g++",
+        parameters: ["g++", sourcePath, "-o", `${outputDirectory}/a.out`, "-std=c++17", "-O2", "-fdiagnostics-color=always", "-DONLINE_JUDGE", "-mx32"],
+        time: 5000,
+        memory: 1024 * 1024 * 1024,
+        process: 10,
+        // This is just a redirection. You can simply ignore this
+        // if you can specify custom location for message output
+        // in the parameter of the compiler, or have redirected the compilation 
+        // message to somewhere.
+        // An example will be available soon.
+        stderr: `${outputDirectory}/message.txt`,
+        // We will read this file for message in the output directory.
+        messageFile: 'message.txt',
+        workingDirectory: outputDirectory
+    }),
+
+    run: (binaryDirectory: string,
+        workingDirectory: string,
+        time: number,
+        memory: number,
+        stdinFile = null,
+        stdoutFile = null,
+        stderrFile = null
+    ) => ({
+        executable: `${binaryDirectory}/a.out`,
+        parameters: [],
+        time: time,
+        memory: memory,
+        stackSize: memory,
+        process: 1,
+        stdin: stdinFile,
+        stdout: stdoutFile,
+        stderr: stderrFile,
+        workingDirectory: workingDirectory
+    })
+};
diff --git a/src/languages/java.ts b/src/languages/java.ts
index 872567c..c097b73 100644
--- a/src/languages/java.ts
+++ b/src/languages/java.ts
@@ -37,7 +37,7 @@ export const lang =  {
         parameters: ["run"],
         time: time,
         memory: memory,
-        process: 15,
+        process: 25,
         stdin: stdinFile,
         stdout: stdoutFile,
         stderr: stderrFile,
diff --git a/src/languages/ocaml.ts b/src/languages/ocaml.ts
index a6d62b9..c0d990f 100644
--- a/src/languages/ocaml.ts
+++ b/src/languages/ocaml.ts
@@ -13,7 +13,7 @@ export const lang =  {
         parameters: ["compile-ocaml", sourcePath, outputDirectory],
         time: 5000,
         memory: 1024 * 1024 * 1024,
-        process: 10,
+        process: 20,
         // This is just a redirection. You can simply ignore this
         // if you can specify custom location for message output
         // in the parameter of the compiler, or have redirected the compilation 
diff --git a/src/languages/python2.ts b/src/languages/python2.ts
index 844b096..522ca8c 100644
--- a/src/languages/python2.ts
+++ b/src/languages/python2.ts
@@ -10,7 +10,7 @@ export const lang =  {
         // write a shell script or some other stuff, 
         // and put it to your sandbox.
         executable: "/usr/bin/compile-script",
-        parameters: ["compile-script", sourcePath, outputDirectory, "python2 -m py_compile a.py"],
+        parameters: ["compile-script", sourcePath, outputDirectory, "pypy -m py_compile a.py"],
         time: 5000,
         memory: 1024 * 1024 * 1024,
         process: 10,
@@ -33,8 +33,8 @@ export const lang =  {
         stdoutFile = null,
         stderrFile = null
     ) => ({
-        executable: "/usr/bin/python2",
-        parameters: ["python2", `${binaryDirectory}/a.py`],
+        executable: "/usr/bin/pypy",
+        parameters: ["pypy", `${binaryDirectory}/a.py`],
         time: time,
         memory: memory,
         process: 1,
diff --git a/src/languages/python3.ts b/src/languages/python3.ts
index 6d62886..49f7b35 100644
--- a/src/languages/python3.ts
+++ b/src/languages/python3.ts
@@ -10,7 +10,7 @@ export const lang =  {
         // write a shell script or some other stuff, 
         // and put it to your sandbox.
         executable: "/usr/bin/compile-script",
-        parameters: ["compile-script", sourcePath, outputDirectory, "python3 -m py_compile a.py"],
+        parameters: ["compile-script", sourcePath, outputDirectory, "pypy3 -m py_compile a.py"],
         time: 5000,
         memory: 1024 * 1024 * 1024,
         process: 10,
@@ -33,8 +33,8 @@ export const lang =  {
         stdoutFile = null,
         stderrFile = null
     ) => ({
-        executable: "/usr/bin/python3",
-        parameters: ["python3", `${binaryDirectory}/a.py`],
+        executable: "/usr/bin/pypy3",
+        parameters: ["pypy3", `${binaryDirectory}/a.py`],
         time: time,
         memory: memory,
         process: 1,