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10201.cpp
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10201.cpp
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#include<cstdio>
#include<cstring>
#define min(a,b) a<b?a:b
#define MAX 10000*2000
int dp[110][210];
main()
{
int T;
char s[100];
int dis[110],price[110];
scanf("%d",&T);
while (T--)
{
int N;
memset(dp,0x7f,sizeof(dp));
dp[0][100]=0;
bool IM=false;
scanf("%d",&N);
getchar();
int k=1;
dis[0]=0,price[0]=0;
while (gets(s)!=NULL)
{
if (strlen(s)==0) break;
sscanf(s,"%d%d",&dis[k],&price[k]);
k++;
}
while (dis[k-1]>N) k--;
for (int i=1;i<k;i++)
for (int j=0;j<=200;j++)
{
for (int l=0;l<=j;l++)
if (dis[i]-dis[i-1]+l<=200)
dp[i][j]=min(dp[i][j],dp[i-1][dis[i]-dis[i-1]+l]+(j-l)*price[i]);
}
if (dp[k-1][100+N-dis[k-1]]>10000*2000 || N-dis[k-1]>100)
printf("Impossible\n");
else
printf("%d\n",dp[k-1][100+N-dis[k-1]]);
if (T) putchar('\n');
}
return 0;
}