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#include "iostream"
#include "algorithm"
double a[30][30]{
{7},
{5,8},
{7,8,8},
{9,2,7,2},
{8,1,4,9,1},
{8,1,8,8,4,1},
{7,9,6,1,4,5,4},
{5,6,5,5,6,9,5,6},
{5,5,4,7,9,3,5,5,1},
{7,5,7,9,7,4,7,3,3,1},
{4,6,4,5,5,8,8,3,2,4,3},
{1,1,3,3,1,6,6,5,5,4,4,2},
{9,9,9,2,1,9,1,9,2,9,5,7,9},
{4,3,3,7,7,9,3,6,1,3,8,8,3,7},
{3,6,8,1,5,3,9,5,8,3,8,1,8,3,3},
{8,3,2,3,3,5,5,8,5,4,2,8,6,7,6,9},
{8,1,8,1,8,4,6,2,2,1,7,9,4,2,3,3,4},
{2,8,4,2,2,9,9,2,8,3,4,9,6,3,9,4,6,9},
{7,9,7,4,9,7,6,6,2,8,9,4,1,8,1,7,2,1,6},
{9,2,8,6,4,2,7,9,5,4,1,2,5,1,7,3,9,8,3,3},
{5,2,1,6,7,9,3,2,8,9,5,5,6,6,6,2,1,8,7,9,9},
{6,7,1,8,8,7,5,3,6,5,4,7,3,4,6,7,8,1,3,2,7,4},
{2,2,6,3,5,3,4,9,2,4,5,7,6,6,3,2,7,2,4,8,5,5,4},
{7,4,4,5,8,3,3,8,1,8,6,3,2,1,6,2,6,4,6,3,8,2,9,6},
{1,2,4,1,3,3,5,3,4,9,6,3,8,6,5,9,1,5,3,2,6,8,8,5,3},
{2,2,7,9,3,3,2,8,6,9,8,4,4,9,5,8,2,6,3,4,8,4,9,3,8,8},
{7,7,7,9,7,5,2,7,9,2,5,1,9,2,6,5,3,9,3,5,7,3,5,4,2,8,9},
{7,7,6,6,8,7,5,5,8,2,4,7,7,4,7,2,6,9,2,1,8,2,9,8,5,7,3,6},
{5,9,4,5,5,7,5,5,6,3,5,3,9,5,8,9,5,4,1,2,6,1,4,3,5,3,2,4,1}
};
int main(){
int i, j;
double max=0, min=9999999;
double result;
for(i=1; i<=29; i++){
for(j=0; j<=i; j++){
//如果为首尾两个数值话，直接自身/2运算
if(j==0){
a[i][j] += a[i-1][0]/2.0;
}else{
//正常两个数值进行向下除法加法运算
a[i][j] += a[i-1][j-1]/2.0 + a[i-1][j]/2.0;
}
}
}
for(i=0; i<=29; i++){
if(a[29][i]<min){
min = a[29][i];
}
if(a[29][i]>max){
max = a[29][i];
}
}
printf("%lf\n",2086458231/min*max);
return 0;
}
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