Submission #1106929

#	Time	Username	Problem	Language	Result	Execution time	Memory
1106929		manhlinh1501	Sirni (COCI17_sirni)	C++17	140 / 140	1318 ms	764120 KiB

sirni

#include<bits/stdc++.h>
using namespace std;
using i64 = long long;

template<class X, class Y>
bool minimize(X &x, const Y &y) {
    if (x > y) {
        x = y;
        return true;
    }
    return false;
}
template<class X, class Y>
bool maximize(X &x, const Y &y) {
    if (x < y) {
        x = y;
        return true;
    }
    return false;
}

using pii = pair<int, int>;
const int MAXN = 1e7 + 5;

namespace dsu {
    vector<int> lab;

    void init(int N) {
        lab.assign(N + 5, -1);
    }

    int root(int u) {
        if(lab[u] < 0) return u;
        return lab[u] = root(lab[u]);
    }

    bool is_same(int u, int v) {
        return root(u) == root(v);
    }

    bool join(int u, int v) {
        if(is_same(u, v)) return false;

        u = root(u);
        v = root(v);

        if(lab[u] > lab[v]) swap(u, v);

        lab[u] += lab[v];
        lab[v] = u;
        return true;
    }
}

int N;
int b[MAXN + 5];
vector<pii> edges[MAXN];

signed main() {
#define task "code"
    if(fopen(task".inp", "r")) {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin >> N;
    vector<int> a(N + 1, 0);
    for(int i = 1; i <= N; i++) cin >> a[i];
    sort(a.begin() + 1, a.end());
    dsu::init(N);
    for(int i = 1; i <= N; i++) {
        int j = i;
        while(j < N and a[i] == a[j + 1]) {
            dsu::join(i, j);
            j++;
        }
        b[a[i]] = i;
        i = j;
    }
    for(int i = a[N]; i >= 1; i--)
        b[i] = (b[i] == 0 ? b[i + 1] : b[i]);
    for(int i = 1; i <= N; i++) {
        int j = i;
        while(j < N and a[i] == a[j + 1]) {
            dsu::join(i, j);
            j++;
        }
        dsu::join(i, j);
        if(b[a[i] + 1])
            edges[a[b[a[i] + 1]] % a[i]].emplace_back(i, b[a[i] + 1]);
        for(int j = 2 * a[i]; j <= a[N]; j += a[i]) {
            if(b[j])
                edges[a[b[j]] % a[i]].emplace_back(i, b[j]);
        }
        i = j;
    }
    i64 ans = 0;
    for(int i = 0; i < MAXN; i++) {
        for(auto [u, v] : edges[i])
            if(dsu::join(u, v))
                ans += i;
    }
    cout << ans;
    return (0 ^ 0);
}

Compilation message (stderr)

sirni.cpp: In function 'int main()':
sirni.cpp:62:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   62 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
sirni.cpp:63:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   63 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• 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