제출 #956535

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
956535		KK_1729	슈퍼트리 잇기 (IOI20_supertrees)	C++17	컴파일 에러	0 ms	0 KiB

supertrees

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

struct UFDS {
    vector<int> link, siz;
    UFDS(int n) : link(n), siz(n, 1) { iota(link.begin(), link.end(), 0); } //each element as its own subset, with size 1
    int findRoot(int x) {
        if(x == link[x]) return x;
        return link[x] = findRoot(link[x]);
        /*
        A shorter way of writing the following is:
        return x == link[x]  ? x : link[x]  =  findRoot(link[x]);  
        */
    }
    bool same(int x, int y) { return findRoot(x) == findRoot(y); }
    bool unite(int x, int y) {
        x = findRoot(x);
        y = findRoot(y);
        if (x == y)
            return false;
        if (siz[x] < siz[y]) swap(x, y);
        siz[x] += siz[y];
        link[y] = x;
        return true;
    }
    int size(int x) { return siz[findRoot(x)]; }
};


int construct(std::vector<std::vector<int>> p) {
	int n = p.size();
	std::vector<std::vector<int>> answer;
	for (int i = 0; i < n; i++) {
		std::vector<int> row;
		row.resize(n);
		answer.push_back(row);
	}


	UFDS ds(n);
	for (int i = 0; i < n; ++i){
		for (int j = 0; j < n; ++j){
			if (p[i][j] == 1) ds.unite(i, j);
			else{
				if (ds.same(i, j)) return 0;
			}
		}
	}


	vector<vector<int>> parents;

	for (int i = 0; i < n; ++i) parents[ds.findRoot(i)].pb(i);
	
	for (auto item: parents){
		int u = item.size();
		FOR(i,0,u-1){
			answer[item[i]][item[i+1]] = 1;
			answer[item[i+1]][item[i]] = 1;
		}
	}
	build(answer);
	return 1;
}

컴파일 시 표준 에러 (stderr) 메시지

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:55:54: error: '__gnu_cxx::__alloc_traits<std::allocator<std::vector<int> >, std::vector<int> >::value_type' {aka 'class std::vector<int>'} has no member named 'pb'
   55 |  for (int i = 0; i < n; ++i) parents[ds.findRoot(i)].pb(i);
      |                                                      ^~
supertrees.cpp:59:7: error: 'i' was not declared in this scope
   59 |   FOR(i,0,u-1){
      |       ^
supertrees.cpp:59:3: error: 'FOR' was not declared in this scope
   59 |   FOR(i,0,u-1){
      |   ^~~