Initial commit

.gitignore

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+*.exe

.vscode/c_cpp_properties.json

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+{
+    "configurations": [
+        {
+            "name": "Win32",
+            "includePath": [
+                "${workspaceFolder}/**"
+            ],
+            "defines": [
+                "_DEBUG",
+                "UNICODE",
+                "_UNICODE"
+            ],
+            "compilerPath": "E:\\Applications\\MSYS2\\ucrt64\\bin\\g++.exe",
+            "cStandard": "c17",
+            "cppStandard": "c++17",
+            "intelliSenseMode": "windows-gcc-x64"
+        }
+    ],
+    "version": 4
+}

.vscode/launch.json

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+{
+    // 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": "g++.exe - Build and debug active file",
+            "type": "cppdbg",
+            "request": "launch",
+            "program": "${fileDirname}\\${fileBasenameNoExtension}.exe",
+            "args": [],
+            "stopAtEntry": false,
+            "cwd": "${fileDirname}",
+            "environment": [],
+            "externalConsole": false,
+            "MIMode": "gdb",
+            "miDebuggerPath": "E:\\Applications\\MSYS2\\ucrt64\\bin\\gdb.exe",
+            "setupCommands": [
+                {
+                    "description": "Enable pretty-printing for gdb",
+                    "text": "-enable-pretty-printing",
+                    "ignoreFailures": true
+                }
+            ],
+            "preLaunchTask": "C/C++: g++.exe build active file"
+        }
+    ]
+}

.vscode/tasks.json

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+{
+	"version": "2.0.0",
+	"tasks": [
+		{
+			"type": "cppbuild",
+			"label": "C/C++: g++.exe build active file",
+			"command": "E:\\Applications\\MSYS2\\ucrt64\\bin\\g++.exe",
+			"args": [
+				"-fdiagnostics-color=always",
+				"-g",
+				"${file}",
+				"-o",
+				"${fileDirname}\\${fileBasenameNoExtension}.exe"
+			],
+			"options": {
+				"cwd": "E:\\Applications\\MSYS2\\ucrt64\\bin"
+			},
+			"problemMatcher": [
+				"$gcc"
+			],
+			"group": {
+				"kind": "build",
+				"isDefault": true
+			},
+			"detail": "compiler: E:\\Applications\\MSYS2\\ucrt64\\bin\\g++.exe"
+		}
+	]
+}

1-1-two-sum.cpp

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+#include <stdio.h>
+#include <stdlib.h>
+
+int *twoSum(int *nums, int numsSize, int target, int *returnSize) {
+    int *ans = (int *)malloc(2 * sizeof(int));
+    *returnSize = 2;
+    for (int i = 0; i < numsSize - 1; i++) {
+        for (int j = i + 1; j < numsSize; j++) {
+            if (nums[i] + nums[j] == target) {
+                ans[0] = i;
+                ans[1] = j;
+                return ans;
+            }
+        }
+    }
+    return ans;
+}
+
+int main() {
+    int nums[] = {3,3};
+    int target = 6;
+    int *ans = NULL;
+    int ans_size = 0;
+    ans = twoSum(nums, sizeof(nums) / sizeof(int), target, &ans_size);
+    printf("size = %d, ans = [%d, %d]\n", ans_size, ans[0], ans[1]);
+    free(ans);
+    return 0;
+}