题解 | 单组_二维数组

package main

import (
	"bufio"
	"fmt"
    "os"
)

func main() {
    reader := bufio.NewReader(os.Stdin)
    var n,m int
    fmt.Fscan(reader, &n)
    fmt.Fscan(reader, &m)
    total := int64(0)
    var a int64
    for i := 0;i<n*m;i++{
        fmt.Fscan(reader, &a)
        total+=a
    }
    fmt.Println(total)
}