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delete pics to save space

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happyZYM
2023-08-03 09:22:52 +08:00
commit de60cd6ed4
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1.2120.cpp Normal file
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#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
typedef long long LL;
const int maxn=1000005;
int n,Q[maxn],L,R;
LL x[maxn],p[maxn],c[maxn],a[maxn],b[maxn],YY[maxn],XX[maxn],f[maxn];
int main()
{
#ifdef local
freopen("pro.in","r",stdin);
#endif
scanf("%d",&n);
for(int i=1;i<=n;i++) scanf("%lld%lld%lld",&x[i],&p[i],&c[i]);
for(int i=1;i<=n;i++) a[i]=a[i-1]+p[i];
for(int i=1;i<=n;i++) b[i]=b[i-1]+p[i]*x[i];
Q[L=R=1]=0;
for(int i=1;i<=n;i++)
{
while(L<R&&YY[Q[L+1]]-YY[Q[L]]<=x[i]*(XX[Q[L+1]]-XX[Q[L]])) L++;
int j=Q[L];
f[i]=f[j]+c[i]+x[i]*(a[i]-a[j])-b[i]+b[j];
XX[i]=a[i];
YY[i]=f[i]+b[i];
while(L<R&&(YY[i]-YY[Q[R-1]])*(XX[Q[R]]-XX[Q[R-1]])<=(YY[Q[R]]-YY[Q[R-1]])*(XX[i]-XX[Q[R-1]])) R--;
Q[++R]=i;
}
printf("%lld\n",f[n]);
return 0;
}