usage:

Step by Step:

Add task in your_leetcode_repo_directory/.vscode/tasks.json

{"tasks": [        {"type":"cppbuild","label":"C/C++: clang++ build active file","command":"/usr/bin/clang++","args": ["-fdiagnostics-color=always","-g","${file}","-DSITAN=1","-o","${fileDirname}/leetcode.out"            ],"options": {"cwd":"${fileDirname}"            },"problemMatcher": ["$gcc"            ],"group": {"kind":"build","isDefault":true            },"detail":"Task generated by Debugger."        }    ],"version":"2.0.0"}

add configuration to your_leetcode_repo_directory/.vscode/launch.json

{// Use IntelliSense to learn about possible attributes.// Hover to view descriptions of existing attributes.// For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387"version":"0.2.0","configurations": [        {"name":"leetcode debug","type":"cppdbg","request":"launch","program":"${workspaceFolder}/leetcode.out","preLaunchTask":"C/C++: clang++ build active file","args": [],"stopAtEntry":false,"cwd":"${fileDirname}","environment": [],"externalConsole":false,"MIMode":"lldb"        }    ]}

add snippets to your_leetcode_repo_directory/.vscode/snippets.leetcode.code-snippets to enable auto template completion.

{"Debug template": {"scope": "cpp","prefix": "DEBUG","body": ["#if defined(SITAN)","int main(){","    $0","}","#endif"]}}

To enable correct highlighting, in your c/c++ extension settings(remember to switch setting scope to your own workspace!!!):