45 lines
1.2 KiB
C++
45 lines
1.2 KiB
C++
#include<iostream>
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using namespace std;
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int dp[1010][1010], price[1010],need[1010];
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int main()
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{
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int week,basecost,cell,storecost,i,j,k,min,mini;
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while(cin>>week)
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{
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if(week==0)
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break;
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cin>>basecost>>storecost>>cell;
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for(i=1;i<=week;i++)
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cin>>price[i]>>need[i];
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for(j=0;j<=cell;j++)
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{
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dp[1][j]=(j+need[1])*price[1]+basecost+j*storecost;
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if(need[1]==0)
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dp[1][0]=0;
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}
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for(i=2;i<=week;i++)
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for(j=0;j<=cell;j++)
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{
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min=10000000;
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for(k=0;k<=cell;k++)
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{
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if(k<=j+need[i])
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{
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if(j==k-need[i])
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mini=dp[i-1][k]+j*storecost;
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else mini=dp[i-1][k]+basecost+(j-k+need[i])*price[i]+j*storecost;
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if(mini<min)
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min=mini;
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}
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}
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dp[i][j]=min;
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}
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min=dp[week][0];
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for(i=1;i<=cell;i++)
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if(dp[week][i]<min)
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min=dp[week][i];
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cout<<min<<endl;
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}
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return 0;
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}
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