Submission #997409

#	Time	Username	Problem	Language	Result	Execution time	Memory
997409		doducanh	Palembang Bridges (APIO15_bridge)	C++14	22 / 100	136 ms	12488 KiB

bridge

#include<bits/stdc++.h>
using namespace std;
#define ii pair<int,int>
#define fi first
#define se second
int k,n;
long long sumL=0,sumU=0;
vector<ii>v;
multiset<int>low;
multiset<int>up;
long long pref[100005];
bool cmp(ii a,ii b)
{
    return (a.fi+a.se)<(b.fi+b.se);
}
void capnhat(int x)
{
    int val;
    if(low.size()==0)val=0;
    else val=*low.rbegin();
    if(x<=val){
        low.insert(x);
        sumL+=x;
    }
    else{
        up.insert(x);
        sumU+=x;
    }
    if(low.size()>up.size()+1){
        up.insert(*low.rbegin());
        sumU+=(*low.rbegin());
        sumL-=(*low.rbegin());
        low.erase(low.find(*low.rbegin()));
    }
    else if(up.size()>low.size()){
        low.insert(*up.begin());
        sumL+=(*up.begin());
        sumU-=(*up.begin());
        up.erase(up.begin());
    }
}
main()
{
    cin>>k>>n;
    long long delt=0;
    for(int i=1;i<=n;i++){
        char a,b;
        int x,y;
        cin>>a>>x>>b>>y;
        if(a==b){
            delt+=abs(x-y);
        }
        else{
            v.push_back({x,y});
        }
    }
    sort(v.begin(),v.end(),cmp);
    long long ans=LLONG_MAX;
    for(int i=0;i<v.size();i++){
        capnhat(v[i].fi);
        capnhat(v[i].se);
        pref[i]=sumU-sumL;

    }
    ans=min(ans,sumU-sumL+(long long)v.size());
    if(k==2){
        sumL=0,sumU=0;
        for(int x:low)low.erase(x);
        for(int x:up)up.erase(x);
        for(int i=v.size();i>0;i--){
            capnhat(v[i].fi);
            capnhat(v[i].se);
            ans=min(ans,pref[i-1]+sumU-sumL+(long long)v.size());
        }
    }

    cout<<ans+delt;
    return 0;
}

Compilation message (stderr)

bridge.cpp:42:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   42 | main()
      | ^~~~
bridge.cpp: In function 'int main()':
bridge.cpp:59:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   59 |     for(int i=0;i<v.size();i++){
      |                 ~^~~~~~~~~

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