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Datatähti 2016 alku

Start:2015-09-28 00:00:00
End:2015-10-12 00:00:00
 

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CSES - Datatähti 2016 alku - Results
History
2015-10-06 17:11:510
2015-10-06 16:31:070
2015-10-06 15:48:030
2015-10-06 15:46:210
2015-10-06 15:41:510
2015-10-06 15:40:04
Task:Lennot
Sender:hugo-hur
Submission time:2015-10-06 15:40:04
Language:C++
Status:COMPILE ERROR

Compiler report

input/code.cpp: In function 'int minDistance(std::vector<unsigned int>, std::vector<bool>)':
input/code.cpp:20:21: error: 'UINT_MAX' was not declared in this scope
  unsigned int min = UINT_MAX, min_index;//INT_MAX, min_index;
                     ^
input/code.cpp:24:19: error: 'min_index' was not declared in this scope
    min = dist[v], min_index = v;
                   ^
input/code.cpp:26:9: error: 'min_index' was not declared in this scope
  return min_index;
         ^
input/code.cpp: In function 'std::vector<unsigned int> dijkstra(std::vector<std::vector<unsigned int> >, int)':
input/code.cpp:50:18: error: 'UINT_MAX' was not declared in this scope
   dist.push_back(UINT_MAX); sptSet.push_back(false);
                  ^
input/code.cpp:72:48: error: 'INT_MAX' was not declared in this scope
    if (!sptSet[v] && graph[u][v] && dist[u] != INT_MAX && dist[u] + graph[u][v] < dist[v]){
                                                ^
input/code.cpp: In function 'int minDistance(std::v

Code

#include <iostream>
#include <list>
#include <vector>

using namespace std;
class Flight
{
public:
	Flight(unsigned int from, unsigned int to, unsigned int price);
	unsigned int from, to, price;
};
Flight::Flight(unsigned int from, unsigned int to, unsigned int price){
	this->from = from; this->to = to; this->price = price;
}
// Number of vertices in the graph
unsigned int V = 4;
int minDistance(std::vector<unsigned int> dist, std::vector<bool> sptSet)
{
	// Initialize min value
	unsigned int min = UINT_MAX, min_index;//INT_MAX, min_index;

	for (unsigned int v = 0; v < V; v++)
		if (sptSet[v] == false && dist[v] <= min)
			min = dist[v], min_index = v;

	return min_index;
}
// A utility function to print the constructed distance array
/*void printSolution(unsigned int dist[], int n)
{
	std::cout << "Vertex   Distance from Source" << std::endl;//printf("Vertex   Distance from Source\n");
	for (int i = 0; i < V; i++)
		printf("%d \t\t %d\n", i, dist[i]);
}*/
// Funtion that implements Dijkstra's single source shortest path algorithm
// for a graph represented using adjacency matrix representation
std::vector<unsigned int> dijkstra(vector<vector<unsigned int>> graph/*[V][V]*/, int src)
{
	
	//unsigned int* dist = new unsigned int[V];     // The output array.  dist[i] will hold the shortest
	std::vector <unsigned int> dist;
	// distance from src to i

	//bool* sptSet = new bool[V]; // sptSet[i] will true if vertex i is included in shortest
	std::vector <bool>sptSet;
	// path tree or shortest distance from src to i is finalized

	// Initialize all distances as INFINITE and stpSet[] as false
	for (unsigned int i = 0; i < V; i++){
		dist.push_back(UINT_MAX); sptSet.push_back(false);
	}//dist[i] = INT_MAX, sptSet[i] = false;

	// Distance of source vertex from itself is always 0
	dist[src] = 0;

	// Find shortest path for all vertices
	for (unsigned int count = 0; count < V - 1; count++)
	{
		// Pick the minimum distance vertex from the set of vertices not
		// yet processed. u is always equal to src in first iteration.
		int u = minDistance(dist, sptSet);

		// Mark the picked vertex as processed
		sptSet[u] = true;

		// Update dist value of the adjacent vertices of the picked vertex.
		for (unsigned int v = 0; v < V; v++)

			// Update dist[v] only if is not in sptSet, there is an edge from 
			// u to v, and total weight of path from src to  v through u is 
			// smaller than current value of dist[v]
			if (!sptSet[v] && graph[u][v] && dist[u] != INT_MAX	&& dist[u] + graph[u][v] < dist[v]){
				dist[v] = dist[u];
				if (v % 2 != 0){//Every other flight is free
					dist[v] += graph[u][v];
				}
				//dist[v] = dist[u] + graph[u][v];
			}
	}

	// print the constructed distance array
	//printSolution(dist, V);
	//delete[] dist;
	//delete[] sptSet;
	return dist;
}
/*unsigned int** createMatrix(std::vector <Flight> flights){
	//unsigned int* matrix = new unsigned int[3];
	//unsigned int** matrix2 = new unsigned int*[flights.size()];
	//matrix2
}*/
vector<vector<unsigned int>> createGraph(vector<Flight> flights, unsigned int n){
	unsigned int v = n;//flights.size();
	vector<vector<unsigned int>> graph;
	for (unsigned int i = 0; i < v; i++){
		//unsigned int* p = new unsigned int[v];
		graph.push_back(vector<unsigned int>());
		for (unsigned int z = 0; z < v; z++){
			graph.back().push_back(0);
		}
	}
	//Arrange flights by "from"
	//For all flights with start point of 1 check the price to dest
	for (Flight f : flights){
		graph[f.from - 1][f.to - 1] = f.price;
	}
	return graph;
}
// Driver program to test methods of graph class
int main()
{
	/* Let us create the example graph discussed above */
	//Price as a distance
	
	unsigned int n = 0;
	unsigned int m = 0;
	cin >> n;
	cin >> m;
	V = n;
	vector<Flight> flights;
	for (unsigned int i = 0; i < m; i++){
		unsigned int from, to, price;
		cin >> from >> to >> price;
		flights.push_back(Flight(from, to, price));
	}
	//cin >> V;
	//vector<Flight> flights;
	//flights.push_back(Flight(1, n, 100));
	//flights.push_back(Flight(1, 2, 10));
	//flights.push_back(Flight(2, n, 10));
	vector<vector<unsigned int>> graph = createGraph(flights, n);
	
	//graph[0][1] = 3;
	//graph[0][2] = 5;
	//graph[1][0] = 2;
		//{ 0, 0, 0, 9, 0, 10, 0, 0, 0 },
		//{ 0, 0, 4, 0, 10, 0, 2, 0, 0 },
		//{ 0, 0, 0, 14, 0, 2, 0, 1, 6 },
		//{ 8, 11, 0, 0, 0, 0, 1, 0, 7 },
		//{ 0, 0, 2, 0, 0, 0, 6, 7, 0 }
	

	unsigned int price = dijkstra(graph, 0).back();
	std::cout << price << std::endl;
	return 0;
}