제출 #1124802

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1124802		KhanhDang	Sirni (COCI17_sirni)	C++20	0 / 140	1275 ms	107124 KiB

sirni

#include<bits/stdc++.h>
using namespace std;
#define        ll long long
#define       pll pair<ll, ll>
#define        fi first
#define        se second
#define    all(v) (v).begin(),(v).end()
#define Unique(v) sort(all(v)); (v).erase(unique(all(v)), (v).end());
const ll N = 1e5+5;
ll n, ans;
ll par[N];
map<ll, ll> f;
vector<ll> pos;
struct Edge {
    ll u, v, w;
};
vector<Edge> e;
ll findSet(ll u) {
    return (u == par[u] ? u : par[u] = findSet(par[u]));
}
void unionSet(ll u, ll v) {
    u = findSet(u);
    v = findSet(v);
    par[u] = v;
}
signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    #define task "task"
    if (fopen(task".INP", "r")) {
        freopen(task".INP", "r", stdin);
        freopen(task".OUT", "w", stdout);
    }
    if (fopen("task.INP", "r")) {
        freopen("task.INP", "r", stdin);
        freopen("task.OUT", "w", stdout);
    }
    cin>>n;
    for (int i = 1; i <= n; i++) par[i] = i;
    for (int i = 1; i <= n; i++) {
        ll x; cin>>x; pos.push_back(x);
        if (f[x] == 0) f[x] = i;
        else unionSet(f[x], i);
    }
    Unique(pos);
    for (auto x : pos) {
        for (int i = 1; ; i++) {
            auto it = upper_bound(all(pos), x * i);
            if (it == pos.end()) break;
            else e.push_back({f[x], f[*it], (*it) % x});
        }
    }
    sort(all(e), [&] (Edge a, Edge b) {
        return a.w < b.w;
    });
    for (auto x : e)
        if (findSet(x.u) != findSet(x.v)) {
            unionSet(x.u, x.v);
            ans += x.w;
        }
    cout<<ans;
}

컴파일 시 표준 에러 (stderr) 메시지

sirni.cpp: In function 'int main()':
sirni.cpp:31:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |         freopen(task".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
sirni.cpp:32:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |         freopen(task".OUT", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
sirni.cpp:35:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 |         freopen("task.INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
sirni.cpp:36:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |         freopen("task.OUT", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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