Submission #544451

#	Time	Username	Problem	Language	Result	Execution time	Memory
544451		Olympia	Sirni (COCI17_sirni)	C++17	70 / 140	5120 ms	786432 KiB

sirni

#include <vector>
#include <algorithm>
#include <iostream>
#include <set>
#include <cmath>
#include <map>
#include <random>
#include <cassert>
#include <ctime>
#include <bitset>
#include <stack>
#include <cstdlib>
#include <queue>
#include <stdint.h>
#include <vector>
#include <cassert>
#include <numeric>
#include <iostream>
#include <algorithm>
#include <functional>
#include <cstdio>
#include <limits.h>

#pragma GCC target ("avx2")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")

using namespace std;

class DisjointSetUnion {
protected:
    vector<int> parent;
    vector<int> compSize;
    const int n;
    int connectedComponents;
public:
    int getConnectedComponents() const {
        return connectedComponents;
    }

public:
    DisjointSetUnion(int sz) : n(sz), connectedComponents(sz) {
        parent.resize(sz), compSize.resize(sz);
        for (int i = 0; i < n; i++) {
            parent[i] = i, compSize[i] = 1;
        }
    }

    int find_head(int x) const {
        int cur = x;
        while (cur != parent[cur]) {
            cur = parent[cur];
        }
        return cur;
    }

    void join(int x, int y) {
        x = find_head(x);
        y = find_head(y);
        if (x == y) {
            return;
        }
        if (compSize[x] > compSize[y]) {
            swap(x, y);
            //ensures that compSize[x1] <= compSize[y1]
        }
        parent[x] = y;
        compSize[y] += compSize[x];
        connectedComponents--;
    }

    bool comp(int x, int y) {
        return (find_head(x) == find_head(y));
    }
};

vector<int> v;

bool comp (pair<int,int> p1, pair<int,int> p2) {
    return min(v[p1.first] % v[p1.second], v[p1.second] % v[p1.first]) < min(v[p2.first] % v[p2.second], v[p2.second] % v[p2.first]);
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int N;
    cin >> N;
    v.resize(N);
    set<int> s;
    for (int i = 0; i < N; i++) {
        cin >> v[i];
        s.insert(v[i]);
    }
    v.clear();
    for (int i: s) v.push_back(i);
    DisjointSetUnion dsu(N);
    int MX = 0;
    for (int i = 0; i < N; i++) {
        MX = max(MX, v[i]);
    }
    MX++;
    int lb[MX + 1];
    for (int i = 0; i <= MX; i++) lb[i] = -1;
    for (int i = 0; i < N; i++) {
        lb[v[i]] = i;
    }
    for (int i = MX - 1; i >= 1; i--) {
        if (lb[i] != -1) {
            continue;
        }
        lb[i] = lb[i + 1];
    }
    int64_t tot = 0;
    vector<pair<int, int>> edges;
    for (int i = 0; i < N; i++) {
        if (i != N - 1) {
            edges.emplace_back(i, i + 1);
        }
        for (int mx = 1; mx * v[i] < MX; mx++) {
            if (lb[mx * v[i]] == -1) {
                continue;
            }
            edges.emplace_back(lb[mx * v[i]], i);
        }
    }
    sort(edges.begin(), edges.end(), comp);
    for (auto &e: edges) {
        if (dsu.comp(e.first, e.second)) {
            continue;
        }
        dsu.join(e.first, e.second);
        tot += min(v[e.first] % v[e.second], v[e.second] % v[e.first]);
    }
    cout << tot;

}

Compilation message (stderr)

sirni.cpp:25: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
   25 | #pragma GCC optimization ("O3")
      | 
sirni.cpp:26: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
   26 | #pragma GCC optimization ("unroll-loops")
      |

• Subtask 1: 14 / 14
• Subtask 2: 0 / 14
• Subtask 3: 14 / 14
• Subtask 4: 14 / 14
• Subtask 5: 0 / 14
• Subtask 6: 14 / 14
• Subtask 7: 14 / 14
• Subtask 8: 0 / 14
• Subtask 9: 0 / 14
• Subtask 10: 0 / 14