Submission #561651

#	Time	Username	Problem	Language	Result	Execution time	Memory
561651		fcmalkcin	Reconstruction Project (JOI22_reconstruction)	C++17	42 / 100	5106 ms	604720 KiB

reconstruction

#include <bits/stdc++.h>
using namespace std;

#define ll  int
#define pll pair<ll,ll>
#define ff first
#define ss second
#define pb push_back
#define endl "\n"
mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());

const ll maxn=503;
const ll maxn1=1e5+10;
const ll mod=1e9+7  ;
const ll base=1e9;


/// i believe myself
/// goal 2/7

ll par[maxn];
ll find_par(ll u)
{
    if (par[u]<0)
        return u;
    return par[u]=find_par(par[u]);
}
bool dsu(ll x,ll y)
{
    x=find_par(x);
    y=find_par(y);
    if (x==y)
        return false;
    if (par[x]>par[y])
        swap(x,y);
    par[x]+=par[y];
    par[y]=x;
    return true;
}
vector<pair<ll,pll>> gr[maxn1];
vector<pll> adjq[maxn1];
long long res[maxn1*10];

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    if (fopen("t.inp","r"))
    {
        freopen("test.inp","r",stdin);
        freopen("test.out","w",stdout);
    }
    ll n, m;
    cin>> n>> m;
    vector<pair<ll,pll>> vt;
    vector<ll> vt1;
    for (int i=1; i<=m; i++)
    {
        ll x, y, w;
        cin>> x>> y>> w;
        vt.pb(make_pair(w,make_pair(x,y)));
        vt1.pb(w);
    }
    sort(vt.begin(),vt.end());
    sort(vt1.begin(),vt1.end());
    vt1.pb(base);
    vt1.resize(unique(vt1.begin(),vt1.end())-vt1.begin());
    ll q;
    cin>> q;
    for (int i=1; i<=q; i++)
    {
        ll x;
        cin>> x;
        auto p=lower_bound(vt1.begin(),vt1.end(),x)-vt1.begin();
        adjq[p].pb(make_pair(x,i));
    }
    vector<pair<ll,pll>> vt2;
    vector<pair<ll,pll>> vtp;
    ll id=0;
    for (int i=0; i<vt1.size(); i++)
    {
        memset(par,-1,sizeof(par));
        vtp.clear();
        while (id<vt.size()&&vt[id].ff==vt1[i])
        {
            auto p=vt[id].ss;
            if (dsu(p.ff,p.ss))
            {
                vtp.pb(vt[id]);
            }
            id++;
        }
        for (auto to:vt2)
        {
            if (dsu(to.ss.ff,to.ss.ss))
                vtp.pb(to);
        }
        gr[i]=vtp;
        swap(vtp,vt2);
    }
    vt2.clear();
    id=vt.size()-1;
    for (int i=vt1.size()-1; i>=0; i--)
    {
        memset(par,-1,sizeof(par));
        vtp.clear();
        while (id>=0&&vt[id].ff==vt1[i])
        {
            auto p=vt[id].ss;
            if (dsu(p.ff,p.ss))
            {
                vtp.pb(vt[id]);
            }
            id--;
        }
        for (auto to:vt2)
        {
            if (dsu(to.ss.ff,to.ss.ss))
                vtp.pb(to);
        }
        for (auto p:adjq[i])
        {
            memset(par,-1,sizeof(par));
            ll idr=0;
            ll idl=0;
            ll cnt=0;
            ll x=p.ff;
            ll id=p.ss;
            long long ans=0;
            while (cnt!=n-1)
            {
                ll val=base+3;
                if (idr<vtp.size()) val=vtp[idr].ff-x;
                ll val1=base+3;
                if (i&&idl<gr[i-1].size()) val1=x-gr[i-1][idl].ff;
                if (val<val1)
                {
                    ll h=dsu(vtp[idr].ss.ff,vtp[idr].ss.ss);
                    cnt+=h;
                    ans+=(h*val);
                    idr++;
                }
                else
                {
                    ll h=dsu(gr[i-1][idl].ss.ff,gr[i-1][idl].ss.ss);
                    cnt+=h;
                    ans+=(h*val1);
                    idl++;
                }
            }
            res[id]=ans;
        }
        swap(vtp,vt2);
    }
    for (int i=1;i<=q;i++) cout <<res[i]<<endl;
}

Compilation message (stderr)

reconstruction.cpp: In function 'int main()':
reconstruction.cpp:81:20: 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<vt1.size(); i++)
      |                   ~^~~~~~~~~~~
reconstruction.cpp:85:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   85 |         while (id<vt.size()&&vt[id].ff==vt1[i])
      |                ~~^~~~~~~~~~
reconstruction.cpp:134:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  134 |                 if (idr<vtp.size()) val=vtp[idr].ff-x;
      |                     ~~~^~~~~~~~~~~
reconstruction.cpp:136:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, std::pair<int, int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  136 |                 if (i&&idl<gr[i-1].size()) val1=x-gr[i-1][idl].ff;
      |                        ~~~^~~~~~~~~~~~~~~
reconstruction.cpp:51:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   51 |         freopen("test.inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
reconstruction.cpp:52:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   52 |         freopen("test.out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 3 / 3
• Subtask 2: 4 / 4
• Subtask 3: 0 / 7
• Subtask 4: 0 / 28
• Subtask 5: 35 / 35
• Subtask 6: 0 / 23