include<stdio.h>

include<stdlib.h>

int main()
{
FILE*fp;
int sum,t,i,j,n,m;
int a[n];

if((fp=fopen("C:\yefei\.txt","w"))==NULL)
{
    printf("File open error!
");
    exit(0);
}

scanf("%d",&n);
fprintf(fp,"%d
",n);

for(i=0;i<n;i++)
{
scanf("%d",&a[i]);
fprintf(fp,"%d,",a[i]);
}

t=a[0];               //假设 
for(i=0;i<n;i++)
{
    sum=0;
    for(j=i;j<n;j++)
	{
        m=a[j];
        sum+=a[j];
          if(m<sum)
	      {
           m=sum;
          }
    }
             if(t<m)
	         {
               t=m;
             }
}

fprintf(fp,"
%d",t); 

if(fclose(fp))
{
    printf("Can not close the file!
");
    exit(0); 
}

return 0;

}
截图一

实验代码二

include<stdio.h>

int main()
{
int T;
scanf("%d ",&T);

int i,j,t,n;
int a[10][10],Tab[100];
for(t=1;t<=T;t++){
	n=1;				
	scanf("%d
",&Tab[t]);	
	for(i=0;i<Tab[t];i++){
		for(j=0;j<Tab[t];j++){
			scanf("%d",&a[i][j]);		
			if(i>j){					
				if(a[i][j]!=0) {
					n=0;
				}
			}
		}
	}
	if(n) printf("YES
");
	else printf("NO
");
}

return 0;

}
截图二