Submission #5938860

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Source Code Expand

#include <iostream>
#include <vector>
#include <algorithm>
#include <random>
#include <chrono>
#include <assert.h>
using namespace std;
using ll = long long;
const ll MOD = 1e9 + 7;

const int N = 10;
bool visited[N];
vector<ll> vals;
ll cost[N][N];
int n, j;

void dfs(int i, ll s) {
	visited[i] = true;
	int outs = 0;
	for (int t = 0; t < n; ++t) {
		if (! visited[t]) {
			++outs;
			dfs(t, s + cost[i][t]);
		}
	}
	if (outs == 0 && i > j) vals.push_back(s);
	visited[i] = false;
}

bool works() {
	for (j = 0; j+1 < n; ++j) dfs(j, 0);
	sort(vals.begin(), vals.end());

	bool ans = true;
	for (int i = 0; i+1 < vals.size(); ++i) {
		if (vals[i] == vals[i+1]) ans = false;
	}
	vals.clear();
	return ans;
}

// rand-function that works properly on windows, and is faster than rand
// https://codeforces.com/blog/entry/61587
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
template<class T>
T rand(T a, T b) {
	return uniform_int_distribution<T>(a, b)(rng);
}

const ll MAX_V = 1e10;

ll log2(int v) {
	int res = 1;
	while(v > 1) {
		v /= 2;
		++res;
	}
	return res;
}

// Find 9 numbers s.t. their sum is distinct
int main() {
	vector<vector<int>> xr = {
	{1},
	{1,2},
	{1,2,4},
	{1,2,4,7},
	{1,2,4,7,12},
	{1,2,4,8,13,18},
	{1,2,4,8,14,19,24},
	{1,2,4,8,15,24,29,34},
	{1,7,10,13,21,26,41,43,45}
	};

	cin >> n;
	while(true) {
		ll b = 1;
		for (int i = 0; i+1 < n; ++i) {
			for (j = i+1; j < n; ++j) {
				cost[i][j] = b * xr[n-2-i][j-1-i];
				cost[j][i] = cost[i][j];
			}
			if (i+2 < n) b *= (xr[n-2-i][n-2-i] + xr[n-2-i][n-3-i]);
		}
		/*
		for (int i = 0; i < n; ++i) {
			for (j = i+1; j < n; ++j) {
				if (rand(0, 1)) cost[i][j] = rand(1ll, MAX_V);
				cost[j][i] = cost[i][j];
			}
		}
		*/
		if (works()) {
			for (int i = 0; i < n; ++i) {
				for (j = 0; j < n; ++j) {
					cout << cost[i][j] << ' ';
				}
				cout << '\n';
			}
			break;
		}
	}
}

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