제출 #544437

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
544437		Olympia	Sirni (COCI17_sirni)	C++17	0 / 140	291 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));
    }
};

int main() {
    freopen("balancing.in", "r", stdin);
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int N;
    cin >> N;
    vector<int> v(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; map<int,int> myMap;
    for (int i = 0; i < N; i++) {
        MX = max(MX, v[i]); myMap[v[i]] = i;
    }
    int64_t tot = 0;
    vector<pair<int,int>> edges[MX + 1];
    for (int i = 0; i < N; i++) {
        if (i != N - 1) {
            edges[v[i + 1]%v[i]].push_back({i, i + 1});
        }
        for (int mx = 1; mx * v[i] <= MX; mx++) {
            auto it = s.lower_bound(mx * v[i]);
            if (it == s.end()) continue;
            int ind = myMap[*it];
            edges[v[ind] % v[i]].push_back({ind, i});
        }
    }
    for (int i = 0; i <= MX; i++) {
        for (auto& e: edges[i]) {
            if (dsu.comp(e.first, e.second)) continue;
            dsu.join(e.first, e.second);
            tot += i;
        }
    }
    cout << tot;

}

컴파일 시 표준 에러 (stderr) 메시지

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")
      | 
sirni.cpp: In function 'int main()':
sirni.cpp:78:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   78 |     freopen("balancing.in", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

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