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下面程序用 0 ~ 9 之间不同的 3 个数构成一个 3 位数,统计出共有多少种方法。请 填空。 #include "stdio.h" void main() { int i,j,k,count=0; for(i=1;i<=9;i++) for(j=0;j<=9;j++) if( )continue; else for(k=0;k<=9;k++) if( )count++; printf("count %d",count); }
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