50 lines
1.2 KiB
C++
50 lines
1.2 KiB
C++
#include <stdio.h>
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#include <string.h>
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#include <algorithm>
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using namespace std;
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#define up(i,x,y) for(i=x;i<=y;i++)
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#define up2(i,x,y) for(i=x;y;i++)
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#define mem(a,b) memset(a,b,sizeof(a))
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#define w(x) while(x)
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#define inf 99999999
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double a[105],dp[1005][105];
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int i,j,k,n,m,t,sum;
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int main()
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{
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up(i,60,100)
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{
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if(i<=69) a[i]=2;
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else if(i<=74) a[i]=2.5;
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else if(i<=79) a[i]=3;
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else if(i<=84) a[i]=3.5;
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else a[i]=4;
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}
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scanf("%d",&t);
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w(t--)
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{
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scanf("%d%d",&m,&n);
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sum=n*m;
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up(i,0,sum)
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up(j,0,n)
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dp[i][j]=inf;
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up(i,60,100)
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dp[i][1]=a[i];
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up(j,2,n)
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up(i,0,sum)
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up2(k,60,(k<=100&&(i-k)>=60*(j-1)))
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dp[i][j]=min(dp[i][j],dp[i-k][j-1]+dp[k][1]);
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printf("%.4f ",dp[sum][n]/n);
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up(i,0,sum)
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up(j,0,n)
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dp[i][j]=0;
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up(i,60,100)
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dp[i][1]=a[i];
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up(j,2,n)
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up(i,0,sum)
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up2(k,60,(k<=100&&(i-k)>=60*(j-1)))
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dp[i][j]=max(dp[i][j],dp[i-k][j-1]+dp[k][1]);
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printf("%.4f\n",dp[sum][n]/n);
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}
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return 0;
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}
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