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添加 58. 区间和 C语言版本

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`@@ -263,3 +263,45 @@ if __name__ == "__main__":`
`263`	`263`	`main()`
`264`	`264`
`265`	`265`	```
	`266`	`+### C`
	`267`	`+`
	`268`	+```C
	`269`	`+#include <stdio.h>`
	`270`	`+#include <stdlib.h>`
	`271`	`+`
	`272`	`+int main(int argc, char *argv[])`
	`273`	`+{`
	`274`	`+ int num;`
	`275`	`+ // 读取数组长度`
	`276`	`+ scanf("%d", &num);`
	`277`	`+`
	`278`	`+ // 使用动态内存分配而不是静态数组,以适应不同的输入大小`
	`279`	`+ int a = (int )malloc((num + 1) * sizeof(int));`
	`280`	`+`
	`281`	`+ // 初始化前缀和数组的第一个元素为0`
	`282`	`+ a[0] = 0;`
	`283`	`+`
	`284`	`+ // 读取数组元素并计算前缀和`
	`285`	`+ for (int i = 1; i <= num; i++)`
	`286`	`+ {`
	`287`	`+ int mm;`
	`288`	`+ scanf("%d", &mm);`
	`289`	`+ // 累加前缀和`
	`290`	`+ a[i] = a[i - 1] + mm;`
	`291`	`+ }`
	`292`	`+`
	`293`	`+ int m, n;`
	`294`	`+ // 循环读取区间并计算区间和,直到输入结束`
	`295`	`+ // scanf()返回成功匹配和赋值的个数,到达文件末尾则返回 EOF`
	`296`	`+ while (scanf("%d%d", &m, &n) == 2)`
	`297`	`+ {`
	`298`	`+ // 输出区间和,注意区间是左闭右开,因此a[n+1]是包含n的元素的前缀和`
	`299`	`+ printf("%d\n", a[n+1] - a[m]);`
	`300`	`+ }`
	`301`	`+`
	`302`	`+ // 释放之前分配的内存`
	`303`	`+ free(a);`
	`304`	`+ return 0;`
	`305`	`+}`
	`306`	`+`
	`307`	+```

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