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Submission #1066593

# Submission time Handle Problem Language Result Execution time Memory
1066593 2024-08-20T02:57:16 Z vjudge1 Building Bridges (CEOI17_building) C++17
0 / 100
 21 ms 8016 KB 
#include <bits/stdc++.h>
using namespace std;
#define fi first
#define se second
#define pu push_back
#define ll long long
typedef pair <long,long> ii;
const int N=1e6;
long long mod=1e9;
long n,m,k;
long a[N+1],g[N+10];
ll dp[N+1];
ii b[N+10];
struct line{
    long a,b,id;
    };
line l[N+1],s[N+1],S[N+1];
double e[N+1];
bool cmp(line A,line B){
    if(A.a!=B.a) return A.a>B.a;
    else return A.b>B.b;
    }
bool ok(long i){
    if(l[i].a==s[k].a) return true;
    if(k==1) return false;
    double x1,x2;
    x1=1.0*(l[i].b-s[k-1].b)/(s[k-1].a-l[i].a);
    x2=1.0*(s[k].b-s[k-1].b)/(s[k-1].a-s[k].a);
    return x1<=x2;
    }
void tinh(){
    cin>>n;
    for(long i=1;i<=n;i++) {cin>>b[i].fi;}
    for(int i=1;i<=n;i++) cin>>b[i].se;
    g[n+1]=0;
    for(int i=n;i>=1;i--) {g[i]=g[i+1]+b[i].se;
    }
    k=1;
    /*
    6
    3 8 7 1 6 6
    0 -1 9 1 2 0
    */
    l[1].b=b[1].fi*b[1].fi+g[2];
    l[1].id=1;
    l[1].a=-2*b[1].fi;
    e[1]=1.0*1e18;
    s[1]=l[1];
    S[1]=l[1];

    dp[1]=0;
    for(long i=2;i<=n;i++){
        long A=-2*b[i].fi,B=0;
        int x=lower_bound(e+1,e+1+k,b[i].fi)-e;
        ll res=0;
        res=s[x].b + s[x].a*b[i].fi + b[i].fi*b[i].fi - g[i];
        dp[i]=res;
        B=dp[i]+g[i+1]+b[i].fi*b[i].fi;
        l[i].a=A;
        l[i].b=B;
        l[i].id=i;
        if(l[i].a==s[k].a and l[i].b>=s[k].b) continue;
        while(k>0 and ok(i)) k--;
        k++;
        s[k]=l[i];
        e[k-1]=1.0*(s[k-1].b-s[k].b)/(s[k].a-s[k-1].a);
        e[k]=1.0*1e18;
     }
    cout<<dp[n];
    }
int main(){
    //freopen("jday.inp","r",stdin);
    //freopen("jday.out","w",stdout);
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    tinh();
    return 0;

}
//code của anh Nam đẹp trai nhất CHL

Subtask #1
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Incorrect 1 ms 348 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 30.0

# Verdict Execution time Memory Grader output
1 Incorrect 21 ms 8016 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Incorrect 1 ms 348 KB Output isn't correct
3 Halted 0 ms 0 KB -