Submission #301281

#	Time	Username	Problem	Language	Result	Execution time	Memory
301281		Gilgamesh	Connecting Supertrees (IOI20_supertrees)	C++17	Compilation error	0 ms	0 KiB

supertrees

#include "supertrees.h"
#include <vector>

const int mxN = 1000;

int parent[mxN];
int rank[mxN];

int find(int x) 
{ 
    if(parent[x] == -1)
        parent[x] = x;
    if (parent[x] != x) { 
        parent[x] = find(parent[x]); 
    }
    return parent[x]; 
}
bool union(int x, int y) 
{ 
    int xRoot = find(x), yRoot = find(y); 
    if (xRoot == yRoot) 
        return false; 
    if (rank[xRoot] < rank[yRoot]) 
        parent[xRoot] = yRoot; 
    else if (rank[yRoot] < rank[xRoot]) 
        parent[yRoot] = xRoot; 
    else 
    { 
        parent[yRoot] = xRoot; 
        rank[xRoot] = rank[xRoot] + 1; 
    } 
    return true;
} 

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);
    }
    for(int i = 0; i < n; ++i){
        parent[i] = i;
    }
    for(int i = 0; i < n; ++i){
        for(int j = i + 1; j < n; ++j){
            if(!p[i][j] && find(i) == find(j)){
                return 0;
            }
            if(p[i][j]) union(i, j);
        }
    }
    for(int i = 0; i < n; ++i){
        int rep = find(i);
        if(rep == i) continue;
        answer[rep][i] = 1;
        answer[i][rep] = 1;
    }
    build(answer);
    return 1;
}

Compilation message (stderr)

supertrees.cpp:18:11: error: expected identifier before '(' token
   18 | bool union(int x, int y)
      |           ^
supertrees.cpp:18:12: error: expected unqualified-id before 'int'
   18 | bool union(int x, int y)
      |            ^~~
supertrees.cpp:18:12: error: expected ')' before 'int'
   18 | bool union(int x, int y)
      |           ~^~~
      |            )
supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:51:25: error: expected primary-expression before 'union'
   51 |             if(p[i][j]) union(i, j);
      |                         ^~~~~