delete pics to save space

1.2365.cpp

@@ -0,0 +1,30 @@
+#include<cstdio>
+#include<cstring>
+using namespace std;
+const int maxn=5005;
+int n,s;
+int St[maxn],Sc[maxn],dp[maxn],q[maxn];
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	scanf("%d%d",&n,&s);
+	for(int i=1;i<=n;i++)
+	{
+		int t,c; scanf("%d%d",&t,&c);
+		St[i]=St[i-1]+t;
+		Sc[i]=Sc[i-1]+c;
+	}
+	memset(dp,0x3f,sizeof(dp)); dp[0]=0;
+	int l=1,r=1;
+	for(int i=1;i<=n;i++)
+	{
+		while(l<r&&(dp[q[l+1]]-dp[q[l]])<=(s+St[i])*(Sc[q[l+1]]-Sc[q[l]])) l++;
+		dp[i]=dp[q[l]]-(s+St[i])*Sc[q[l]]+St[i]*Sc[i]+s*Sc[n];
+		while(l<r&&(dp[q[r]]-dp[q[r-1]])*(Sc[i]-Sc[q[r]])>=(dp[i]-dp[q[r]])*(Sc[q[r]]-Sc[q[r-1]])) r--;
+		q[++r]=i;
+	}
+	printf("%d\n",dp[n]);
+	return 0;
+}