Submission #405044

#	Time	Username	Problem	Language	Result	Execution time	Memory
405044		ly20	Connecting Supertrees (IOI20_supertrees)	C++17	0 / 100	2 ms	464 KiB

supertrees

#include "supertrees.h"
#include <bits/stdc++.h>
using namespace std;
const int MAXN = 1123;
int comp[MAXN];
vector <int> grafo[MAXN];
int marc[MAXN];
int cmp;
//vector <int> grafo2[MAXN];
vector <int> cat;
int dfs(int v) {
    marc[v] = 1;
    comp[v] = cmp;
    for(int i = 0; i < grafo[v].size(); i++) {
        int viz = grafo[v][i];
        if(marc[viz] == 1) continue;
        dfs(viz);
    }
}
int resp[MAXN][MAXN];
int rep[MAXN];
vector <int> cic;
vector <vector <int> > answer;
int construct(vector<vector<int>> p) {
	int n = p.size();
	vector<vector<int>> answer;
    for(int i = 0; i < n; i++) {
        comp[i] = i;
    }
    for(int i = 0; i < n; i++) {
        for(int j = 0; j < n; j++) {
            if(p[i][j] == 1) {
                grafo[i].push_back(j); grafo[j].push_back(i);
            }
        }
    }
    for(int i = 0; i < n; i++) {
        if(marc[i] == 0) {
            dfs(i);
            cmp++;
        }
    }
    for(int i = 0; i < cmp; i++) {
        vector <int> ln;
        for(int j = 0; j < n; j++) if(comp[j] == i) ln.push_back(j);
        int m = ln.size();
        for(int j = 0; j < m; j++) {
            int cur = ln[j];
            for(int k = j + 1; k < m; k++) {
                int tst = ln[k];
                if(p[cur][tst] != 1) {
                    return 0;
                }
            }
        }
        for(int j = 0; j < m - 1; j++) {
            int pr = j + 1;
            resp[ln[j]][ln[pr]] = 1;
            resp[ln[pr]][ln[j]] = 1;
        }
    }
	for (int i = 0; i < n; i++) {
		vector<int> row;
		for(int j = 0; j < n; j++) {
            row.push_back(resp[i][j]);
		}
		answer.push_back(row);
	}
	build(answer);
	return 1;
}

Compilation message (stderr)

supertrees.cpp: In function 'int dfs(int)':
supertrees.cpp:14:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |     for(int i = 0; i < grafo[v].size(); i++) {
      |                    ~~^~~~~~~~~~~~~~~~~
supertrees.cpp:19:1: warning: no return statement in function returning non-void [-Wreturn-type]
   19 | }
      | ^

• Subtask 1: 0 / 11
• Subtask 2: 0 / 10
• Subtask 3: 0 / 19
• Subtask 4: 0 / 35
• Subtask 5: 0 / 21
• Subtask 6: 0 / 4