結果

問題 No.1917 LCMST
ユーザー vjudge1
提出日時 2025-07-20 18:23:41
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
WA  
実行時間 -
コード長 14,586 bytes
コンパイル時間 2,426 ms
コンパイル使用メモリ 209,060 KB
実行使用メモリ 510,108 KB
最終ジャッジ日時 2025-07-20 18:25:10
合計ジャッジ時間 87,266 ms
ジャッジサーバーID
（参考情報） 		judge3 / judge5
このコードへのチャレンジ
（要ログイン）
ファイルパターン 結果
sample AC * 3
other AC * 1 WA * 40 TLE * 1
権限があれば一括ダウンロードができます
コンパイルメッセージ
main.cpp: In function ‘int main()’:
main.cpp:158:16: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  158 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
main.cpp:159:16: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  159 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

ソースコード

diff # 

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

#define endl '\n'
#define sz(v) (int)v.size()
#define all(v) v.begin(), v.end()
#define filter(v) v.resize(unique(all(v)) - v.begin())
#define dbg(x) "[" #x " = " << (x) << "]"

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

template<typename T> bool maximize(T &a, T b) {
    if(a < b) {
        a = b;
        return true;
    }else return false;
}
template<typename T> bool minimize(T &a, T b) {
    if(a > b) {
        a = b;
        return true;
    }else return false;
}
template<typename T> T rnd(T a, T b) {
    return uniform_int_distribution<T>(a, b)(rng);
}

typedef long long ll;
typedef long double ld;

struct DSU {
    int n;
    vector<int> par, siz;

    DSU () {}
    DSU (int n) : n(n), par(n + 3), siz(n + 3) {
        for(int i = 1; i <= n; i++) {
            par[i] = i;
            siz[i] = 1;
        }
    }

    int root(int u) {
        return u == par[u] ? u : par[u] = root(par[u]);
    }

    int unite(int u, int v) {
        u = root(u); v = root(v);
        if(u != v) {
            if(siz[u] < siz[v]) swap(u, v);
            par[v] = u;
            siz[u] += siz[v];
            if(siz[u] == n) return 2;
            else return 1;
        }else return 0;
    }
};

const int N = 1e6 + 3;

int n;
int a[N];

namespace subtask_1 {
    bool valid() {
        return n <= 1000;
    }

    struct Edge {
            int u, v, w;
        };

        bool cmp_edge(Edge x, Edge y) {
            return x.w > y.w;
    }

    void solve() {
        vector<Edge> edges;
        for(int i = 1; i <= n; i++) {
            for(int j = i + 1; j <= n; j++) {
                edges.push_back({i, j, __gcd(a[i], a[j])});
            }
        }

        sort(all(edges), cmp_edge);
        DSU dsu(n); ll answer = 0;

        for(int i = 0; i < sz(edges); i++) {
            int k = dsu.unite(edges[i].u, edges[i].v);
            if(k > 0) {
//                cout << dbg(edges[i].u) << dbg(edges[i].v) << dbg(edges[i].w) << endl;
                answer += edges[i].w;
                if(k == 2) break;
            }
        }

        cout << answer << endl;
    }
}

namespace subtask_3 {
    bool valid() {
        return true;
    }

    vector<int> _div[N];

    void solve() {
        for(int i = 1; i <= n; i++) {
            for(int d = 1; d * d <= a[i]; d++) {
                if(a[i] % d == 0) {
                    _div[d].push_back(i);
                    if(d != a[i] / d) _div[a[i] / d].push_back(i);
                }
            }
        }

        DSU dsu(n);
        ll answer = 0;

        for(int gcd = N - 1; gcd >= 1; gcd--) {
            sort(all(_div[gcd]), [&](int x, int y){
                return a[x] < a[y];
            });

            for(int i = 1; i < sz(_div[gcd]); i++) {
                int k = dsu.unite(_div[gcd][0], _div[gcd][i]);
                if(k) {
                    answer += a[_div[gcd][0]] * a[_div[gcd][i]] / gcd;
                    if(k == 2) return cout << answer << endl, void();
                }
            }
        }

        cout << answer << endl;
    }
}

void process() {
    // if(subtask_1::valid()) return subtask_1::solve();
    if(subtask_3::valid()) return subtask_3::solve();
}

void input() {
    cin >> n;

    for(int i = 1; i <= n; i++) {
        cin >> a[i];
    }
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    #define task "CAYKHUNG"
    if(fopen(task".inp", "r")) {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }

    int testcase = 1; // cin >> testcase;
    for(int i = 1; i <= testcase; i++) {
        input();
        process();
    }

    cerr << "Saa, watashtachi no deito hajimemashou" << endl;
    cerr << "Atarashii kiseki wo koko kara hajimeru shining place nee mou ichido kimi to..." << endl;

    return 0;
}

/*
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*/
0