//UVa815 - Flooded!
//直接模拟，注意考虑临界情况
include
include
using namespace std;
int main(){

//freopen("UVa815.in","r",stdin);

int n, m, kase = 1;

while(scanf("%d%d",&n,&m)==2 &&n &&m){

int ans[3030], i;  ans[0] = 1;

for(i = 1; i<=nm; i++) scanf("%d",&ans[i]);

double h, h2 = 0.0; scanf("%lf",&h); h/=100.0;  //h为原来的水位,h2为每次用掉的水

sort(ans+1,ans+nm+1);

for(i = 1; i < nm; i++){

h2 = i(ans[i+1]-ans[i]);

if(h>=h2)h -= h2;           //本次填水后是否仍有剩余

else {ans[0] = 0; break;}   //ans[0]用作开关

}

printf("Region %d\n",kase++);

printf("Water level is %.2lf meters.\n",ans[0]? (ans[nm]+h/n/m): (ans[i]+h/i));

printf("%.2lf percent of the region is under water.\n\n",ans[0]? (100): (i1.0/n/m)100);

}

return 0;

}
/测试数据(考虑填满)：已AC

3 3

25 37 45

51 12 34

94 83 27

100000

3 1

-6

-5

-4

301

0 0

/