Submission #1043697

#TimeUsernameProblemLanguageResultExecution timeMemory
1043697DeathIsAweConnecting Supertrees (IOI20_supertrees)C++14
0 / 100
0 ms348 KiB
#include "supertrees.h" #include <bits/stdc++.h> using namespace std; int construct(vector<vector<int>> p) { int n = p.size(), prev; vector<vector<int>> ans(n); bool visited[n]; for (int i=0;i<n;i++) { visited[i] = false; for (int j=0;j<n;j++) { ans[i].push_back(0); } } vector<vector<int>> currentnodes(3); for (int i=0;i<n;i++) { if (visited[i]) { continue; } visited[i] = true; for (int j=0;j<3;j++) { currentnodes[j].clear(); } for (int j=0;j<n;j++) { if (j == i) { continue; } if (p[i][j] > 0) { if (visited[j]) { return 0; } visited[j] = true; if (p[i][j] == 1) { currentnodes[1].push_back(j); } else if (p[i][j] == 2) { currentnodes[2].push_back(j); } else if (p[i][j] == 3) { return 0; } } } //for (int j: currentnodes[1]) { // cout << j << ' '; //} //cout << '\n'; //for (int j: currentnodes[2]) { // cout << j << ' '; //} //cout << '\n'; for (int j: currentnodes[1]) { for (int k=0;k<n;k++) { if (!visited[k]) { if (p[j][k] != 0) { return 0; } } } } for (int j: currentnodes[2]) { for (int k=0;k<n;k++) { if (!visited[k]) { if (p[j][k] != 0) { return 0; } } } } if (currentnodes[2].size() == 1) { return 0; } for (int j: currentnodes[1]) { for (int k: currentnodes[1]) { if (p[j][k] != 1) { return 0; } } for (int k: currentnodes[2]) { if (p[j][k] != 2) { return 0; } } } for (int j: currentnodes[2]) { for (int k: currentnodes[2]) { if (j == k) { continue; } if (p[j][k] != 2) { return 0; } } } prev = i; for (int j: currentnodes[1]) { ans[prev][j] = 1; ans[j][prev] = 1; prev = j; } prev = i; for (int j: currentnodes[2]) { ans[prev][j] = 1; ans[j][prev] = 1; prev = j; } ans[prev][i] = 1; ans[i][prev] = 1; } build(ans); return 1; }
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