Submission #931713

#	Time	Username	Problem	Language	Result	Execution time	Memory
931713		Aiperiii	Wiring (IOI17_wiring)	C++14	100 / 100	85 ms	15032 KiB

wiring

#include <bits/stdc++.h>
#include "wiring.h"
#define ll long long
#define ff first
#define ss second
#define all(x) x.begin(),x.end()
#define pb push_back
using namespace std;
const int N=2e5+5;
ll dp[N],pr[N];
long long min_total_length(vector<int> r,vector<int> b) {
    vector <pair <ll,ll> > v;
    v.pb({0,-1});
    for(int i=0;i<r.size();i++)v.pb({r[i],-1});
    for(int i=0;i<b.size();i++)v.pb({b[i],1});
    sort(all(v));
    int cnt=0;
    map <int,int> pos;
    for(int i=1;i<v.size();i++){
        pr[i]=pr[i-1]+v[i].ff*v[i].ss;
        cnt+=v[i].ss;
        ll x=1e18;
        if(v[i].ss==-1){
            auto it=upper_bound(all(b),v[i].ff);
            if(it!=b.end())x=min(x,*it-v[i].ff);
            if(it!=b.begin()){
                it--;
                x=min(x,abs(*it-v[i].ff));
            }
        }
        else{
            auto it=upper_bound(all(r),v[i].ff);
            if(it!=r.end())x=min(x,*it-v[i].ff);
            if(it!=r.begin()){
                it--;
                x=min(x,abs(*it-v[i].ff));
            }
        }
        dp[i]=dp[i-1]+x;
        if(cnt==0 or pos[cnt]>0)dp[i]=min(dp[i],dp[pos[cnt]]+abs(pr[i]-pr[pos[cnt]]));
        pos[cnt]=i;
    }
    return dp[v.size()-1];
}
/*signed main(){
    ios_base::sync_with_stdio();
    cin.tie(0);cout.tie(0);
    int n,m;
    cin>>n>>m;
    vector <int> a(n),b(m);
    for(int i=0;i<n;i++)cin>>a[i];
    for(int i=0;i<m;i++)cin>>b[i];
    cout<<min_total_length(a,b);
}*/
/*
1 2 3 7
0 4 5 9 10
 0,0 0,1 1,0, 2,0 3,0 4,1 5,1 7,0 9,1 10,1
   0  0  -1   -3
   0  1   1    3
 */

Compilation message (stderr)

wiring.cpp: In function 'long long int min_total_length(std::vector<int>, std::vector<int>)':
wiring.cpp:14:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |     for(int i=0;i<r.size();i++)v.pb({r[i],-1});
      |                 ~^~~~~~~~~
wiring.cpp:15:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   15 |     for(int i=0;i<b.size();i++)v.pb({b[i],1});
      |                 ~^~~~~~~~~
wiring.cpp:19:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |     for(int i=1;i<v.size();i++){
      |                 ~^~~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 13 / 13
• Subtask 3: 10 / 10
• Subtask 4: 25 / 25
• Subtask 5: 45 / 45