Submission #950335

#	Time	Username	Problem	Language	Result	Execution time	Memory
950335		JakobZorz	Palembang Bridges (APIO15_bridge)	C++17	22 / 100	63 ms	2792 KiB

bridge

#include<iostream>
#include<vector>
#include<queue>
#include<stack>
#include<algorithm>
#include<limits.h>
#include<math.h>
#include<map>
#include<set>
#include<unordered_map>
#include<unordered_set>
#include<iomanip>
#include<cstring>
#include<random>
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
using namespace std;

vector<pair<int,int>>arr;

ll eval(int br){
    ll res=0;
    for(auto[i,j]:arr)
        res+=2*max(0,max(i-br,br-j));
    return res;
}

ll eval2(int br1,int br2){
    ll res=0;
    for(auto[i,j]:arr)
        res+=2*max(0,min(max(i-br1,br1-j),max(i-br2,br2-j)));
    return res;
}

ll eval3(int br){
    int l=br,r=1e9+1;
    while(l<r-1){
        int m=(l+r)/2;
        if(eval2(br,m)>eval2(br,m+1))
            l=m;
        else
            r=m;
    }
    return eval2(br,r);
}

void solve(){
    int k,n;
    cin>>k>>n;
    ll res1=0;
    for(int i=0;i<n;i++){
        char c1,c2;
        int a1,a2;
        cin>>c1>>a1>>c2>>a2;
        res1+=abs(a1-a2);
        if(c1!=c2){
            res1++;
            if(a1>a2)
                swap(a1,a2);
            arr.emplace_back(a1,a2);
        }
    }
    
    vector<int>pos;
    for(auto[i,j]:arr){
        pos.push_back(i);
        pos.push_back(j);
    }
    sort(pos.begin(),pos.end());
    
    ll res2=1e18;
    if(k==1){
        int l=-1,r=1e9+1;
        while(l<r-1){
            int m=(l+r)/2;
            if(eval(m)>eval(m+1))
                l=m;
            else
                r=m;
        }
        res2=eval(r);
    }else{ // k == 2
        int l=-1,r=1e9+1;
        while(l<r-1){
            int m=(l+r)/2;
            if(eval3(m)>eval3(m+1))
                l=m;
            else
                r=m;
        }
        res2=eval3(r);
    }
    
    cout<<res1+res2<<"\n";
}
 
int main(){
    ios::sync_with_stdio(false);cout.tie(NULL);cin.tie(NULL);
    //freopen("/Users/jakob/cp_testing/test.txt","r",stdin);//freopen("output.out","w",stdout);
    int t=1;//cin>>t;
    while(t--)solve();
    return 0;
}
 
 
/*

 
1 5
B 0 A 4
B 1 B 3
A 5 B 7
B 2 A 6
B 1 A 7
 
24

2 5
B 0 A 4
B 1 B 3
A 5 B 7
B 2 A 6
B 1 A 7
 
22


 */

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