一直在做黑白棋，估计是格式错误一直A不了，于是跳过去了，看这道题挺水的，第一次在UVa上出PE有点小激动，原来UVa也有PE啊，但是PE的原因让我很无语，输出是两个数据间有空行，习惯的控制了最后不输出多余的空行，所以才PE的。。。

#include
    
     #include
     
      #include
      
       #include
       
        #define N m * n#define V_WATER (water[i + 1] - water[i])using namespace std;int water[1000];int main() {    int m, n, times = 0;    double V;    while(cin >> m >> n&& m) {        double k = m * n, d = 1, sum = 0;        double vegion = 0, tall = 0;        for(int i = 0; i < N; i++)            cin >> water[i];        cin >> V;        V /= 100;        sort(water, water + N);        tall = water[0];        for(int i = 0; i < N - 1; i++) {            sum += d * (V_WATER);            if(sum < V) {                    vegion = sum;                    tall += V_WATER;                    d++;            } else {                tall += (V - vegion) / d;                sum += d * (V - vegion);                break;            }        }        if(sum < V)            tall += (V - sum) / d;        cout << "Region " << ++times << endl;        printf("Water level is %.2lf meters.\n", tall);        printf("%.2lf percent of the region is under water.\n\n", d * 100 / k);        memset(water, 0, sizeof(water));    }}