Submission #955116

#	Time	Username	Problem	Language	Result	Execution time	Memory
955116		hihihihaw	Palembang Bridges (APIO15_bridge)	C++17	0 / 100	0 ms	436 KiB

bridge

#pragma GCC optimize("O3,unroll-loops")    
#include <bits/stdc++.h>
using namespace std;
 
#define int long long
#define pb push_back
#define pii pair<int,int>
#define sz(v) (int)v.size()
#define fi first
#define se second
#define INF 1223372036854775807
#define MOD 1000000007
#define cint(x) int x;cin>>x;
#define cinarr(a,n) int a[n];for (int i=0;i<n;i++) cin>>a[i];
#define coutarr(a) for (auto d:a) cout<<d<<" "; cout<<endl;
#define coutarrD(a) for (auto d:a) cout<<d.fi<<","<<d.se<<" "; cout<<endl;
#define AYBERK_SARICA ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define endl '\n'
#define ld long double

int t=1;
int usaco=0;

void solve(){
    int k,n;
    cin>>k>>n;
    vector<vector<int>> v;
    int ans=0;
    for (int i=0;i<n;i++){
        char c1,c2;
        int x1,x2;
        cin>>c1>>x1>>c2>>x2;
        if (c1==c2) ans+=abs(x1-x2);
        else{
            ans++;
            v.pb({x1+x2,x1,x2});
        }
    }
    sort(v.begin(),v.end());
    int pfMed[sz(v)];
    multiset<int> s1;multiset<int> s2;
    int sm1=0,sm2=0;
    for (int i=0;i<sz(v);i++){
        if (i==0){
            if (v[i][1]<v[i][2]){
                s1.insert(v[i][1]);sm1+=v[i][1];
                s2.insert(v[i][2]);sm2+=v[i][2];
            }
            else{
                s2.insert(v[i][1]);sm2+=v[i][1];
                s1.insert(v[i][2]);sm1+=v[i][1];
            }
        }
        else{
            if (v[i][1]>=*s2.begin()){ s2.insert(v[i][1]);sm2+=v[i][1];}
            else{sm1+=v[i][1];s1.insert(v[i][1]);}
            if (v[i][2]>=*s2.begin()){ s2.insert(v[i][2]);sm2+=v[i][2];}
            else{sm1+=v[i][2];s1.insert(v[i][2]);}
            if (sz(s1)>sz(s2)){
                sm2+=*s1.rbegin();
                s2.insert(*s1.rbegin());
                sm1-=*(--s1.end());
                s1.erase(--s1.end());
            }
            else if (sz(s2)>sz(s1)){
                sm1+=*s2.begin();
                s1.insert(*s2.begin());
                sm2-=*s2.begin();
                s2.erase(s2.begin());
            }
        }
        pfMed[i]=sm2-sm1;
    }
    int sfMed[sz(v)];
    s1.clear();s2.clear();
    sm1=0,sm2=0;
    for (int i=sz(v)-1;i>=0;i--){
        if (i==sz(v)-1){
            if (v[i][1]<v[i][2]){
                s1.insert(v[i][1]);sm1+=v[i][1];
                s2.insert(v[i][2]);sm2+=v[i][2];
            }
            else{
                s2.insert(v[i][1]);sm2+=v[i][1];
                s1.insert(v[i][2]);sm1+=v[i][1];
            }
        }
        else{
            if (v[i][1]>=*s2.begin()){ s2.insert(v[i][1]);sm2+=v[i][1];}
            else{sm1+=v[i][1];s1.insert(v[i][1]);}
            if (v[i][2]>=*s2.begin()){ s2.insert(v[i][2]);sm2+=v[i][2];}
            else{sm1+=v[i][2];s1.insert(v[i][2]);}
            if (sz(s1)>sz(s2)){
                sm2+=*s1.rbegin();
                s2.insert(*s1.rbegin());
                sm1-=*(--s1.end());
                s1.erase(--s1.end());
            }
            else if (sz(s2)>sz(s1)){
                sm1+=*s2.begin();
                s1.insert(*s2.begin());
                sm2-=*s2.begin();
                s2.erase(s2.begin());
            }
        }
        sfMed[i]=sm2-sm1;
    }
    int mn=INF;
    for (int i=0;i<sz(v)-1;i++){
        mn=min(mn,sfMed[i+1]+pfMed[i]);
    }
    cout<<mn+ans<<endl;

}  
    

    

 
 
 
 
int32_t main(){
    
    
    //AYBERK_SARICA;
    if (usaco){
        freopen("fortmoo.in", "r", stdin);
        freopen("fortmoo.out", "w", stdout);
    }
    #ifdef Local
        freopen("in.txt", "r", stdin);
        freopen("out.txt", "w", stdout);
        //freopen("wormsort.out", "w", stdout);
    #endif
    if (t==1) solve();
    else{
        cin>>t;
        while (t--) solve();
    }
    
        
    return 0;
}

Compilation message (stderr)

bridge.cpp: In function 'int32_t main()':
bridge.cpp:128:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  128 |         freopen("fortmoo.in", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
bridge.cpp:129:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  129 |         freopen("fortmoo.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

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