按理说 Mono 应该兼容 C# 阿

但是这个程序本地 cs 过得去，洛谷的 mono 就报 CE，求助怎么改

int read() {
    char c = (char)Console.Read();
    int s = 0, f = 1;
    while (c < '0' || c > '9') {
        if (c == '-') f = -1;
        c = (char)Console.Read();
    }
    while (c >= '0' && c <= '9') {
        s = (s << 1) + (s << 3) + c - 48;
        c = (char)Console.Read();
    }
    return s * f;
}
int n = read();
int[] a = new int[n + 5];
for (int i = 1; i <= n; i++) a[i] = read();
int[] sum = new int[n + 5];
for (int i = 1; i <= n; i++) sum[i] = sum[i - 1] + a[i];
int T = read();
while (T-- != 0) {
    int x = read(), y = read();
    Console.WriteLine(sum[y] - sum[x - 1]);
}

因为 cs 的输入太 shit 所以自己写的输入

报错：

error CS1525: Unexpected symbol `int'

顺便问洛谷为什么不支持纯 cs