Submission #969635

#	Time	Username	Problem	Language	Result	Execution time	Memory
969635		batsukh2006	Palembang Bridges (APIO15_bridge)	C++17	22 / 100	235 ms	18564 KiB

bridge

#include<iostream>
#include<stdio.h>
#include<math.h>
#include<map>
#include<string>
#include<algorithm>
#include<vector>
#include<string.h>
#include<utility>
#include<set>
#include<cmath>
#include<queue>
#include<deque>
#include<functional>
#include<stack>
#include<limits.h>
#include<iomanip>
#include<unordered_map> 
#include<numeric>
#include<tuple>
#include<bitset>
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
#define MOD 1000000007
#define int long long
#define ss second
#define ff first
#define endl '\n'
#define ordered_set tree<pair<int, int>, null_type, less_equal<pair<int, int> >, rb_tree_tag, tree_order_statistics_node_update>
signed main(){
    // freopen("file.in", "r", stdin);
    // freopen("file.out", "w", stdout);
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    
    int k,n; cin>>k>>n;
    int sum=0;
    vector<pair<int,int> > v,d;
    for(int i=0,j=0; i<n; i++){
    	int s,t;
    	char p,q;
    	cin>>p>>s>>q>>t;
    	if(p==q){
    		sum+=abs(s-t);
    	}else{
    		sum++;
    		v.push_back({s,j});
    		v.push_back({t,j});
    		d.push_back({s,t});
    		j++;
    	}
    }
    if(v.empty()){
    	cout<<sum;
    	return 0;
    }
    int sl=0,sr=0;
    ordered_set f,s;
    vector<bool> vis(n);
    sort(v.begin(),v.end());
    for(int i=0; i<v.size(); i++) s.insert({v[i].ff,v[i].ss});
    int ml=(*s.find_by_order(1)).ff;
	int mr=(*s.find_by_order(s.size()/2)).ff;
    for(int i=0; i<v.size(); i++) sr+=abs(mr-v[i].ff);
    int res=sl+sr;
    if(k==1){
	    cout<<res+sum;
	}else{
		for(int i=0; i<v.size(); i++){
			if(!vis[v[i].ss]){
				vis[v[i].ss]=1;
				s.erase(s.upper_bound({d[v[i].ss].ff,v[i].ss}));
				s.erase(s.upper_bound({d[v[i].ss].ss,v[i].ss}));
				f.insert({d[v[i].ss].ff,v[i].ss});
				f.insert({d[v[i].ss].ss,v[i].ss});
				int fh=(f.size()-1)/2,sh=s.size()/2;
				int pl=(*f.find_by_order(fh)).ff;
				int pr=(*s.find_by_order(sh)).ff;
				if(f.size()==2) ml=pl;
				sl+=abs(d[v[i].ss].ff-ml);
				sl+=abs(d[v[i].ss].ss-ml);
				sl+=fh*(pl-ml);
				sl-=(f.size()-fh)*(pl-ml);
				sr-=abs(d[v[i].ss].ff-mr);
				sr-=abs(d[v[i].ss].ss-mr);
				sr+=sh*(pr-mr);
				sr-=(s.size()-sh)*(pr-mr);
				ml=pl;
				mr=pr;
				res=min(res,sl+sr);
			}
		}
		cout<<res+sum;
	}
    return 0;
}

Compilation message (stderr)

bridge.cpp: In function 'int main()':
bridge.cpp:64:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   64 |     for(int i=0; i<v.size(); i++) s.insert({v[i].ff,v[i].ss});
      |                  ~^~~~~~~~~
bridge.cpp:67:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   67 |     for(int i=0; i<v.size(); i++) sr+=abs(mr-v[i].ff);
      |                  ~^~~~~~~~~
bridge.cpp:72:17: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   72 |   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