\u7f16\u5199\u7a0b\u5e8f \u6c42sum=1+11+111+1111+11111\u3002

#include
#include
int main()
{
int a=1,i;
int sum=0;
for(i=0;i<2;i++)
{
if(i=0) // \u8fd9\u91cc\u5199\u9519\u4e86\uff01\u5e94\u8be5\u662fi==0, \u5426\u5219\u9677\u5165\u6b7b\u5faa\u73af\u3002

{
sum+=a;
}
else
{
a=pow(10.,i)+a;
sum+=a;
}
}
printf("%d",sum);
}

int cal(){
int i=1;
int sum = 0;
while(i<=6){
int subsum = 0;
int flag = 1;
for(int j=1;j<i;j++){
flag *= 10;
subsum += flag;
}
if(subsum == 0)
subsum = 1;
sum += subsum;
i++;
}
return sum;
}
\u5176\u5b9e\u4e0d\u7528\u5faa\u73af\u8fd9\u4e2a\u9898\u662f\u5f88\u7b80\u5355\u7684\uff0c\u5e94\u8be5\u81ea\u5df1\u603b\u7ed3\u89c4\u5f8b\u5f97\u5230\u4e00\u4e2a\u516c\u5f0f\uff0c\u5c3d\u91cf\u51cf\u8f7b\u8ba1\u7b97\u673a\u7684\u5de5\u4f5c\u91cf\u3002