Submission #1104964

#	Time	Username	Problem	Language	Result	Execution time	Memory
1104964		lmaobruh	Sirni (COCI17_sirni)	C++14	140 / 140	2586 ms	474964 KiB

sirni

#include <bits/stdc++.h>
using namespace std;
#define fi first
#define se second
#define pb push_back
#define ll long long
#define fi first
#define se second
#define ii pair<int,int>
#define fo(i,a,b) for (int i = (a); i <= (b); ++i)
#define fd(i,a,b) for (int i = (a); i >= (b); --i)
#define all(x) x.begin(), x.end()
template<typename T> void _do(T x) { cerr << x << '\n'; }
template<typename T, typename ...U> void _do(T x, U ...y) { cerr << x << ", "; _do(y...); }
#define db(...) cerr << #__VA_ARGS__ << " = "; _do(__VA_ARGS__);
bool ST;
const int N = 1e5+5, M = 1e7+5, inf = 1e9, LOG = 19;

struct EDGE {
    int u, v, c;
    bool operator < (const EDGE &o) const {
        return c < o.c;
    }
};
vector<EDGE> e;

int n, a[N], nxt[M], p[M];
bitset<M> b;

int find(int u) {
    return (u == p[u] ? u : p[u] = find(p[u]));
}

bool merge(int u, int v) {
    u = find(u), v = find(v);
    if (u == v) return 0;
    return p[u] = v, 1;
}

void solve() {
    cin >> n;
    fo(i,1,n) cin >> a[i], b[a[i]] = 1;
    fo(i,1,M-1) p[i] = i;
    int lst = -1;
    fd(i,M-1,1) {
        nxt[i] = lst;
        if (b[i]) lst = i;
    }
    fo(i,1,M-1) if (b[i]) for (int j = i; j < M; j += i) {
        if (nxt[j] == -1) break;
        if (nxt[j] <= j + i) e.pb({i, nxt[j], nxt[j]%i});
        if (j + i < M && b[i+j]) e.pb({i, j+i, 0});
    }
    sort(all(e));
//    for (EDGE it : e) dbg(it.u, it.v, it.c);
    ll ans = 0;
    for (EDGE it : e) if (merge(it.u, it.v)) ans += it.c;
    cout << ans;
}

bool EN;
int main() {
    cin.tie(0)->sync_with_stdio(0);
    if (fopen("A.inp", "r")) {
        freopen("A.inp", "r", stdin);
        freopen("A.out", "w", stdout);
    }
    int testcase = 1;
//    cin >> testcase;
    while (testcase--) solve();
//    cerr << '\n' << abs(&EN - &ST) / 1024.0 / 1024.0;
}

Compilation message (stderr)

sirni.cpp: In function 'int main()':
sirni.cpp:65:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |         freopen("A.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
sirni.cpp:66:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   66 |         freopen("A.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