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#include<stdio.h>
int main()
{
    int i,j,n,b=1;
        scanf("%d",&n);
        for(i=1;i<=2*n-1;i++)
        {
        i<=n?b=i:b=2*n-i;
            for(j=1;j<=2*(n-b);j++)
                        printf(" ";
                for(j=n;j>=n-b+1;j--)
                    printf("%-2d",j);
                        for(j=j+2;j<=n;j++)
                        printf("%-2d",j);
                        printf("\n";
                        }
}
ÔÚGCC£¨3.3£©ÔËÐУ¬ÏÔʾ±àÒëʧ°Ü£¬main.c: In function `main':
main.c:8: warning: use of conditional expressions as lvalues is deprecated
main.c:8: error: invalid lvalue in assignment
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