使用BufferedWriter.write() 代替 System.out.print() 就可以AC

API中对于BufferedWriter的write(int c)解释为“Writes a single character”，所以其实写入的数据类型为char，内存长度只有2个字节，而且是以Unicode编码，所以会出现乱码。故需要wirte(c + “”)，将输入类型装换为String类型即可。

import java.util.Scanner;
import java.io.*;
class Main{
    public static void main(String[] args) throws IOException{
        Scanner sc = new Scanner(System.in);
        BufferedWriter buf = new BufferedWriter(new OutputStreamWriter(System.out));
        int n = sc.nextInt();
        int m = sc.nextInt();
        int q = sc.nextInt();
        int[][] b = new int[n+2][m+2];
        for(int i = 1; i <= n; i++){
            for(int j = 1; j <= m; j++){
                insert(b, i, j, i, j, sc.nextInt());
            }
        }
        while(q-- > 0){
            int x1 = sc.nextInt();
            int y1 = sc.nextInt();
            int x2 = sc.nextInt();
            int y2 = sc.nextInt();
            int c = sc.nextInt();
            insert(b, x1, y1, x2, y2, c);
        }
        for(int i = 1; i <= n; i++){
            for(int j = 1; j <=m; j++){
                b[i][j] = b[i-1][j] + b[i][j-1] - b[i-1][j-1] + b[i][j];
                buf.write(b[i][j] + " ");
            }
            buf.write("\n");
        }
        buf.flush();
    }

    private static void insert(int[][] b, int x1, int y1, int x2, int y2, int c){
        b[x1][y1] += c;
        b[x2+1][y1] -= c;
        b[x1][y2+1] -= c;
        b[x2+1][y2+1] += c;
    }
}