[HDU3507]Print Article

XVI.[HDU3507]Print Article

没什么好说的，这题比任务安排还水，随便推推完事。

代码：

#include<bits/stdc++.h>
using namespace std;
#define int long long
int n,m,s[500100],f[500100],q[500100],l,r;
signed main(){
	while(scanf("%lld%lld",&n,&m)!=EOF){
		for(int i=1;i<=n;i++){
			scanf("%lld",&s[i]);
			if(!s[i]){i--,n--;continue;}
			s[i]+=s[i-1];
		}
//		for(int i=1;i<=n;i++)printf("%d ",s[i]);puts("");
		l=r=0;
		for(int i=1;i<=n;i++){
			while(r-l&&f[q[l]]-f[q[l+1]]+s[q[l]]*s[q[l]]-s[q[l+1]]*s[q[l+1]]>=2*s[i]*(s[q[l]]-s[q[l+1]]))l++;
			f[i]=f[q[l]]+m+(s[i]-s[q[l]])*(s[i]-s[q[l]]);
			while(r-l&&(f[q[r-1]]-f[q[r]]+s[q[r-1]]*s[q[r-1]]-s[q[r]]*s[q[r]])*(s[q[r]]-s[i])>=(f[q[r]]-f[i]+s[q[r]]*s[q[r]]-s[i]*s[i])*(s[q[r-1]]-s[q[r]]))r--;
			q[++r]=i;
		}
		printf("%lld\n",f[n]);
	}
	return 0;
}