Submission #997391

#	Time	Username	Problem	Language	Result	Execution time	Memory
997391		doducanh	Palembang Bridges (APIO15_bridge)	C++14	22 / 100	162 ms	3772 KiB

bridge

#include <bits/stdc++.h>

using namespace std;
#define ii pair<int,int>
const int maxn=1e5+7;
struct nguoi
{
    int xo,yo,xt,yt;
};
nguoi a[maxn];
int k,n;
vector<ii>v;
vector<int>tmp;
long long f(int t)
{
    long long sum=0;
    for(auto [x,y]:v){
        sum+=(abs(x-t)+abs(y-t)+1);
    }
    return sum;
}
void sub1()
{
    long long delt=0;
    for(int i=1;i<=n;i++){
        char xo,xt;
        cin>>xo>>a[i].yo>>xt>>a[i].yt;
        a[i].xo=(xo=='B');
        a[i].xt=(xt=='B');
        if(xo==xt){
            delt+=abs(a[i].yt-a[i].yo);
        }
        else{
            tmp.push_back(a[i].yo);
            tmp.push_back(a[i].yt);
            v.push_back({a[i].yo,a[i].yt});
        }

    }
    int l=0,r=1e9+7;
    while(r-l>1000){
        int m1=l+(r-l)/3;
        int m2=r-(r-l)/3;
        if(f(m1)<f(m2)){
            r=m2;
        }
        else l=m1;
    }
//    for(auto [x,y]:v){
//        cout<<x<<" "<<y<<"\n";
//    }
    long long ans=LLONG_MAX;
    for(auto i=l;i<=r;i++){
        ans=min(ans,f(i));
//        if(f(i)==18)cout<<i;
//        cout<<f(i)<<"\n";
    }
    cout<<ans+delt;
}
void sub2()
{
    long long delt=0;
    for(int i=1;i<=n;i++){
        char xo,xt;
        cin>>xo>>a[i].yo>>xt>>a[i].yt;
        a[i].xo=(xo=='B');
        a[i].xt=(xt=='B');
        tmp.push_back(a[i].yo);
        tmp.push_back(a[i].yt);
        if(xo==xt){
            delt+=abs(a[i].yt-a[i].yo);
        }
        else{
            v.push_back({a[i].yo,a[i].yt});
        }

    }
    sort(tmp.begin(),tmp.end());
    tmp.erase(unique(tmp.begin(),tmp.end()),tmp.end());
    long long ans=LLONG_MAX;
    for(int i=0;i<tmp.size()-1;i++){
        for(int j=i+1;j<tmp.size();j++){
            int to=tmp[i],tt=tmp[j];
            for(auto [x,y]:v){
                ans=min(ans,min((long long)abs(x-to)+abs(y-to)+1,(long long)abs(x-tt)+abs(y-tt)+1));
            }
        }
    }
    cout<<ans+delt;
}
main()
{
    cin>>k>>n;
    if(k==1){
        sub1();
    }
    else sub2();
    return 0;
}
/*
1 5
B 0 A 4
B 1 B 3
A 5 B 7
B 2 A 6
B 1 A 7
*/

Compilation message (stderr)

bridge.cpp: In function 'long long int f(int)':
bridge.cpp:17:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   17 |     for(auto [x,y]:v){
      |              ^
bridge.cpp: In function 'void sub2()':
bridge.cpp:81:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   81 |     for(int i=0;i<tmp.size()-1;i++){
      |                 ~^~~~~~~~~~~~~
bridge.cpp:82:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   82 |         for(int j=i+1;j<tmp.size();j++){
      |                       ~^~~~~~~~~~~
bridge.cpp:84:22: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   84 |             for(auto [x,y]:v){
      |                      ^
bridge.cpp: At global scope:
bridge.cpp:91:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   91 | main()
      | ^~~~

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