Merge pull request #2716 from catherinexrk/master

添加0058 区间和 JavaScript版本

problems/kamacoder/0058.区间和.md

@@ -263,6 +263,57 @@ if __name__ == "__main__":
     main()
 
 ```
+
+
+###  JavaScript
+
+``` JavaScript
+
+function prefixSum() {
+    const readline = require('readline');
+
+    const rl = readline.createInterface({
+        input: process.stdin,
+        output: process.stdout
+    });
+
+    let inputLines = [];
+    rl.on('line', (line) => {
+        inputLines.push(line.trim());
+    });
+
+    rl.on('close', () => {
+        // 读取项数 n
+        const n = parseInt(inputLines[0]);
+
+        // 使用前缀和，复杂度控制在 O(1)
+        let sum = new Array(n);
+        sum[0] = parseInt(inputLines[1]);
+
+        // 计算前缀和数组
+        for (let i = 1; i < n; i++) {
+            let value = parseInt(inputLines[i + 1]);
+            sum[i] = sum[i - 1] + value;
+        }
+
+        // 处理区间和查询
+        for (let i = n + 1; i < inputLines.length; i++) {
+            let [left, right] = inputLines[i].split(' ').map(Number);
+
+            if (left === 0) {
+                console.log(sum[right]);
+            } else {
+                console.log(sum[right] - sum[left - 1]);
+            }
+        }
+    });
+}
+
+
+```
+
+
+
 ### C
 
 ```C
@@ -305,3 +356,4 @@ int main(int argc, char *argv[])
 }
 
 ```
+