27 lines
528 B
C++
27 lines
528 B
C++
#include<cstdio>
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#include<climits>
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int main()
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{
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int maxw,len,n,i,j,t,w[10001],s[10001];
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long long tw;
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double f[10001];
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scanf("%d%d%d",&maxw,&len,&n);
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for(i=1;i<=n;i++) scanf("%d%d",&w[i],&s[i]);
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for(i=1;i<=n;i++)
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f[i]=99999999999999999999;
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f[0]=0;
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for(i=1;i<=n;i++)
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{
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t=INT_MAX;
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tw=0;
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for(j=i-1;j>=0;j--)
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{
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if (s[j+1]<t) t=s[j+1];
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tw=tw+w[j+1];
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if (tw>maxw) break;
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if (f[j]+(len+0.0)/t<f[i]) f[i]=f[j]+(len+0.0)/t;
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}
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}
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printf("%.1lf",f[n]*60);
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}
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