Submission #315457

#	Time	Username	Problem	Language	Result	Execution time	Memory
315457		tevdore	Connecting Supertrees (IOI20_supertrees)	C++14	0 / 100	1 ms	288 KiB

supertrees

#include<bits/stdc++.h>
#include "supertrees.h"
using namespace std;
const int N = 1e3 + 10;
int f[N], a[N], P[N];
int find_set(int x) {
    if(x == P[x]) return x;
    return P[x] = find_set(P[x]);
}
void union_set(int x, int y) {
    x = find_set(x);
    y = find_set(y);
    P[y] = x;
}
int construct(vector < vector < int > > p) {
    for(int i = 0; i < p.size(); i++) P[i] = i;
    for(int i = 0; i < p.size(); i++) {
        for(int j = 0; j < p.size(); j++) {
            if(p[i][j] != 0) union_set(i, j);
        }
    }
    for(int i = 0; i < p.size(); i++) {
        for(int j = 0; j < p.size(); j++) {
            if(p[i][j] == 3 || (find_set(i) == find_set(j) && p[i][j] == 0)) return 0;
        }
    }
    vector < vector < int > > vr(p.size(), vector < int > (0, 0));
    for(int i = 0; i < p.size(); i++) {
        int m = find_set(i);
        vr[m].push_back(i);
    }
    int q = 0;
    vector < vector < int > > ans(p.size(), vector < int > (p.size(), 0));
    for(int i = 0; i < p.size(); i++) P[i] = i;
    for(int i = 0; i < p.size(); i++) {
        if(vr[i].size()) {
            for(int u : vr[i]) {
                for(int v : vr[i]) {
                    if(p[u][v] == 1) {
                        union_set(u, v);
                    }
                }
            }
            for(int u : vr[i]) {
                for(int v : vr[i]) {
                    if(p[u][v] == 2) {
                        if(find_set(u) == find_set(v)) return 0;
                    }
                }
            }
            for(int j = 0; j < p.size(); j++) f[j] = -1e9;
            for(int u : vr[i]) {
                if(u == find_set(u)) {
                    a[++q] = u;
                }
                int m = find_set(u);
                if(f[m] != -1e9) {
                    ans[f[m]][u] = 1;
                    ans[u][f[m]] = 1;
                }
                f[m] = u;
            }
        }
    }
    if(q == 2) return 0;
    for(int i = 2; i <= q + 1; i++) {
        if(q + 1 == i) {
            if(a[i - 1] != a[i - q]) {
                ans[a[i - 1]][a[i - q]] = 1;
                ans[a[i - q]][a[i - 1]] = 1;
            }
        }
        ans[a[i]][a[i - 1]] = 1;
        ans[a[i - 1]][a[i]] = 1;
    }
    build(ans);
    return 1;
}
// main() {
//     cout << construct({{1, 1, 2 , 2}, {1, 1, 2, 2}, {2, 2, 1, 2}, {2, 2, 2, 1}}) << "\n";
// }

Compilation message (stderr)

supertrees.cpp: In function 'int construct(std::vector<std::vector<int> >)':
supertrees.cpp:16:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |     for(int i = 0; i < p.size(); i++) P[i] = i;
      |                    ~~^~~~~~~~~~
supertrees.cpp:17:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |     for(int i = 0; i < p.size(); i++) {
      |                    ~~^~~~~~~~~~
supertrees.cpp:18:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 |         for(int j = 0; j < p.size(); j++) {
      |                        ~~^~~~~~~~~~
supertrees.cpp:22:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |     for(int i = 0; i < p.size(); i++) {
      |                    ~~^~~~~~~~~~
supertrees.cpp:23:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |         for(int j = 0; j < p.size(); j++) {
      |                        ~~^~~~~~~~~~
supertrees.cpp:28:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |     for(int i = 0; i < p.size(); i++) {
      |                    ~~^~~~~~~~~~
supertrees.cpp:34:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |     for(int i = 0; i < p.size(); i++) P[i] = i;
      |                    ~~^~~~~~~~~~
supertrees.cpp:35:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |     for(int i = 0; i < p.size(); i++) {
      |                    ~~^~~~~~~~~~
supertrees.cpp:51:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 |             for(int j = 0; j < p.size(); j++) f[j] = -1e9;
      |                            ~~^~~~~~~~~~

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