Submission #561809

#	Time	Username	Problem	Language	Result	Execution time	Memory
561809		fcmalkcin	Reconstruction Project (JOI22_reconstruction)	C++17	100 / 100	1951 ms	34328 KiB

reconstruction

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

#define ll  long long
#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;
}


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)));
    }
    sort(vt.begin(),vt.end());
    vector<pair<ll,pll>> vt2;
    for (int i=1;i<=m;i++)
    {
        ll j=i+1;
        memset(par,-1,sizeof(par));
        while (j<=m)
        {
            dsu(vt[j-1].ss.ff,vt[j-1].ss.ss);
            if (find_par(vt[i-1].ss.ff)==find_par(vt[i-1].ss.ss))
            {
                break;
            }
            j++;
        }
        ll k=i-1;
        memset(par,-1,sizeof(par));
        while (k)
        {
            dsu(vt[k-1].ss.ff,vt[k-1].ss.ss);
            if (find_par(vt[i-1].ss.ff)==find_par(vt[i-1].ss.ss))
            {
                break;
            }
            k--;
        }
        vt2.pb(make_pair((k==0?-1:(vt[k-1].ff+vt[i-1].ff+1)/2),make_pair(-1,vt[i-1].ff)));
        vt2.pb(make_pair(vt[i-1].ff,make_pair(2,-2*vt[i-1].ff)));
        vt2.pb(make_pair((j==m+1?base+1:(vt[j-1].ff+vt[i-1].ff+1)/2),make_pair(-1,vt[i-1].ff)));
    }
    ll sl=0;
    ll cnt=0;
    ll q;
    cin>> q;
    sort(vt2.begin(),vt2.end());
    ll id=0;
    for (int i=1;i<=q;i++)
    {
        ll x;
        cin>> x;
        while (id<vt2.size()&&vt2[id].ff<=x)
        {
            auto p=vt2[id].ss;
            sl+=p.ff;
            cnt+=p.ss;
            id++;
        }
        cout <<sl*x+cnt<<endl;
    }
}

Compilation message (stderr)

reconstruction.cpp: In function 'int main()':
reconstruction.cpp:102:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, std::pair<long long int, long long int> > >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  102 |         while (id<vt2.size()&&vt2[id].ff<=x)
      |                ~~^~~~~~~~~~~
reconstruction.cpp:49:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   49 |         freopen("test.inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
reconstruction.cpp:50:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   50 |         freopen("test.out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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