Submission #347840

#	Time	Username	Problem	Language	Result	Execution time	Memory
347840		saral	Pictionary (COCI18_pictionary)	C++14	140 / 140	378 ms	30944 KiB

pictionary

#include <bits/stdc++.h>

using namespace std;
#define lli long long int
const int N = 100100;
int t, n, m, Q;
lli u[N], sol[N];
pair<lli, lli > q[N];
vector<lli>v;
vector<pair<int, int> > pom;

int ufind (int x) {
    if (u[x]==x) return x;
    lli sad = ufind(u[x]);
    if (sad != u[x]) {
        pom.push_back(make_pair(x, u[x]));
    }
    u[x]=sad;
    return u[x];
}

void umerge (int x, int y) {
    x = ufind(x);
    y = ufind(y);
    if (x==y) return;
    if (rand()%2) {
        pom.push_back(make_pair(x, u[x]));
        u[x]=y;
    }
    else {
        pom.push_back(make_pair(y, u[y]));
        u[y]=x;
    }
return;
}
int br=0;
void f (lli l, lli r, vector<lli>Qpos) {;
    /*cout << br << endl;
    br++;*/
    //cout << "da\n";
    //cout << l << " " << (l+r)/2 << " " << r << "  " << Qpos.size() << endl;
    /*for (int i = 0; i < Qpos.size(); i++) {
        cout << Qpos[i] << " ";
    }
    cout << endl;*/

    if (l==r) {
        for (int i = 0; i < Qpos.size(); i++) {
            sol[Qpos[i]]=l;
        }
        return;
    }
    if (Qpos.empty()) return;
    int last = pom.size();
    int mid = (l+r)/2;
    for (int i = l; i <= mid; i++) {
        int curr = m-i+1, foll = curr*2;
        while (foll <= n) {
            umerge (curr, foll);
            foll+=curr;
        }
    }

    //for (int i = 1; i <= n; i++) cout << i << ": " << ufind(i) << ", " << pom[i] << endl;
    //system("pause");

    vector<lli>left;
    vector<lli>right;

    for (int i = 0; i < Qpos.size(); i++) {
        int a1=q[Qpos[i]].first, a2=q[Qpos[i]].second;
        if (ufind(a1)==ufind(a2)) {
            left.push_back(Qpos[i]);
        }
        else {
            right.push_back(Qpos[i]);
        }
    }
    /*cout << "right:";
    for (int i = 0; i < right.size(); i++) cout << right[i] << " ";
    cout << "\n";
    cout << "idem desno: \n";*/
    f (mid+1, r, right);
    //cout << "idem lijevo: \n";
    while (pom.size() > last) {
        int k = pom.size()-1;
        u[pom[k].first] = pom[k].second;
        pom.pop_back();
    }
    f (l, mid, left);
return;
}

void solve () {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    cin >> n >> m >> Q;
    for (int i = 1; i <= Q; i++) {
        cin >> q[i].first >> q[i].second;
        v.push_back(i);
    }
    for (int i = 1; i <= n; i++) {
        u[i]=i;
    }
    f (1, m, v);
    for (int i = 1; i <= Q; i++) cout << sol[i] << "\n";
return;
}

int main () {
	solve();

return 0;
}
/*
25 6 1
25 10
*/

Compilation message (stderr)

pictionary.cpp: In function 'void f(long long int, long long int, std::vector<long long int>)':
pictionary.cpp:48:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   48 |         for (int i = 0; i < Qpos.size(); i++) {
      |                         ~~^~~~~~~~~~~~~
pictionary.cpp:70:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   70 |     for (int i = 0; i < Qpos.size(); i++) {
      |                     ~~^~~~~~~~~~~~~
pictionary.cpp:85:23: warning: comparison of integer expressions of different signedness: 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   85 |     while (pom.size() > last) {
      |            ~~~~~~~~~~~^~~~~~

• Subtask 1: 14 / 14
• Subtask 2: 14 / 14
• Subtask 3: 14 / 14
• Subtask 4: 14 / 14
• Subtask 5: 14 / 14
• Subtask 6: 14 / 14
• Subtask 7: 14 / 14
• Subtask 8: 14 / 14
• Subtask 9: 14 / 14
• Subtask 10: 14 / 14