JAVA(HDU）杭电ACM 2955

import java.util.Scanner;

public class Main {

public static void main(String args[]){
int n,i,j,s;
Scanner scan = new Scanner(System.in);
n = scan.nextInt();
for(s=0;s<n;s++){

float p = scan.nextFloat();
int bankNumber = scan.nextInt();
//每个银行有点钱
int[] M = new int[bankNumber];
//概率
float[] Pro = new float[bankNumber];
//记录所有银行的总价值
int totalM = 0;
//读取数据
for(i=0;i<bankNumber;i++){
M[i] = scan.nextInt();
totalM += M[i];
Pro[i] = scan.nextFloat();
}
float[] dp = new float[totalM+1];
dp[0] = 1;
for(i = 1;i<=totalM;++i)
dp[i] = -1;
//dp[j] :在0-i个银行中,抢到money为j时风险的最小值
for(i=0;i<bankNumber;i++){
for(j=totalM;j>=M[i];j--){                  dp[j] = max(dp[j],dp[j-M[i]]*(1-Pro[i]));
}//endfor
}//end for
//找到指定概率条件下最大的价值
for(j = totalM;j >= 0 ;j--){
if(dp[j] >= 1-p){
System.out.println(j);
break;
}
}//end for

}

}

private static float max(float i, float j) {
return (i>=j?i:j);
}
}