Submission #408782

#	Time	Username	Problem	Language	Result	Execution time	Memory
408782		MOUF_MAHMALAT	Palembang Bridges (APIO15_bridge)	C++14	22 / 100	51 ms	7500 KiB

bridge

#include<bits/stdc++.h>
#define all(s) s.begin(),s.end()
using namespace std;
typedef long long ll;
ll n,k,ans,x,y,p[200009],a[200009];
char c1,c2;
vector<ll>v;
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin>>k>>n;
    for(ll i=0; i<n; i++)
    {
        cin>>c1>>x>>c2>>y;
        if(c1==c2)
            ans+=abs(x-y);
        else
        {
            v.push_back(x);
            v.push_back(y);
            ans++;//for bridge length
        }
    }
    n=v.size();
    v.push_back(-1),sort(all(v));
    for(ll i=1; i<v.size(); i++)
        p[i]=p[i-1]+v[i];
    for(ll i=1; i<v.size(); i++)
    {
        ll psum=abs(p[i]-i*v[i]);
        ll ssum=abs(p[n]-p[i]-(n-i)*v[i]);
        a[i] = psum + ssum;
        if(k==1)
            continue;
        ll l=i-1,r=n+1,m;
        while(r-l>1)
        {
            m=(l+r)/2;
            ll m2=(v[i]+v[m])/2,id,le=i-1,re=m+1;
            while(re-le>1)
            {
                id=(le+re)/2;
                if(v[id]<=m2)
                    le=id;
                else
                    re=id;
            }
            id=le;
            psum=abs(p[i]-i*v[i])+abs(p[id]-p[i]*(id-i)*v[i]);
            ssum=abs(p[m]-p[id]-(m-id)*v[m])+abs(p[n]-p[m-1]-(n-m)*v[m]);
            if(a[i]<=psum+ssum)
            {
                a[i]=psum+ssum;
                l=m;
            }
            else
                r=m;
        }

    }
    for(ll i=2; i<=n; i++)
        a[i]=min(a[i],a[i-1]);
    cout<<a[n]+ans;
    return 0;
}

Compilation message (stderr)

bridge.cpp: In function 'int main()':
bridge.cpp:28:18: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |     for(ll i=1; i<v.size(); i++)
      |                 ~^~~~~~~~~
bridge.cpp:30:18: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 |     for(ll i=1; i<v.size(); i++)
      |                 ~^~~~~~~~~

• Subtask 1: 8 / 8
• Subtask 2: 14 / 14
• Subtask 3: 0 / 9
• Subtask 4: 0 / 32
• Subtask 5: 0 / 37