제출 #1022589

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1022589		dpsaveslives	Sirni (COCI17_sirni)	C++17	0 / 140	329 ms	50496 KiB

sirni

#include <bits/stdc++.h>
using namespace std;
struct DSU{
    int N;
    vector<int> d;
    void init(int n){
        N = n;
        d = vector<int>(N,-1);
    }
    int finden(int x){
        if(d[x] < 0) return x;
        return finden(d[x]);
    }
    bool unite(int a, int b){
        a = finden(a), b = finden(b);
        if(a == b) return false;
        if(d[a] > d[b]){
            swap(a,b);
        } //absolute of d[a] is smaller than absolute of d[b], so there are less in a than in b, although we want to add b to a
        d[a] += d[b]; d[b] = a;
        return true;
    }
}D;
struct edge{
    int u,v,w;
    bool operator<(const edge &b){
        return w < b.w;
    }
};
int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    int N; cin >> N;
    vector<int> P(N);
    int maxx = 0;
    for(int i = 0;i<N;++i){
        cin >> P[i];
        maxx = max(maxx,P[i]);
    }
    D.init(N);
    sort(P.begin(),P.end());
    vector<edge> edges;
    for(int i = 0;i<N;++i){
        for(int j = P[i];j <= maxx; j += P[i]){
            int it;
            if(j == P[i]){
                it = upper_bound(P.begin(),P.end(),j)-P.begin();
            }
            else it = lower_bound(P.begin(),P.end(),j)-P.begin();
            if(it == P.size()) continue;
            edge e; e.u = i; e.v = it; e.w = P[it]-j;
            edges.push_back(e);
            int cur = P[it]-j;
            while(it+1 < P.size() && P[it+1]-j == cur){
                ++it;
                e.u = i; e.v = it; e.w = P[it]-j;
                edges.push_back(e);
            }

        }
    }
    sort(edges.begin(),edges.end());
    int ans = 0, cnt = N-1;
    for(int i = 0;i<edges.size();++i){
        if(D.unite(edges[i].u,edges[i].v)){
            ans += edges[i].w;
            --cnt;
        }
        if(cnt == 0) break;
    }
    cout << ans << "\n";
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

sirni.cpp: In function 'int main()':
sirni.cpp:50:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |             if(it == P.size()) continue;
      |                ~~~^~~~~~~~~~~
sirni.cpp:54:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |             while(it+1 < P.size() && P[it+1]-j == cur){
      |                   ~~~~~^~~~~~~~~~
sirni.cpp:64:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<edge>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   64 |     for(int i = 0;i<edges.size();++i){
      |                   ~^~~~~~~~~~~~~

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