lemon-0.x: src/work/marci/oldies/dimacs.hh@22ce98f7d0f1 (annotated)

marci@69	1	#ifndef DIMACS_HH
marci@69	2	#define DIMACS_HH
marci@69	3
marci@69	4	#include <iostream>
marci@69	5	#include <string>
marci@69	6	#include <vector>
marci@69	7
alpar@105	8	namespace hugo {
marci@69	9
marci@69	10	template<typename Graph, typename CapacityMap>
marci@69	11	void readDimacsMaxFlow(std::istream& is, Graph &G, typename Graph::NodeIt &s, typename Graph::NodeIt &t, CapacityMap& capacity) {
marci@69	12	G.clear();
marci@69	13	int cap;
marci@69	14	char d;
marci@69	15	std::string problem;
marci@69	16	char c;
marci@69	17	int i, j;
marci@69	18	std::string str;
marci@69	19	int n, m;
marci@69	20	std::vector<typename Graph::NodeIt> nodes;
marci@69	21	while (is>>c) {
marci@69	22	switch (c) {
marci@69	23	case 'c': //comment
marci@69	24	getline(is, str);
marci@69	25	break;
marci@69	26	case 't': //type
marci@69	27	getline(is, str);
marci@69	28	break;
marci@69	29	case 'p': //problem definition
marci@69	30	is >> problem >> n >> m;
marci@69	31	getline(is, str);
marci@69	32	nodes.resize(n+1);
marci@69	33	for (int k=1; k<=n; ++k) nodes[k]=G.addNode();
marci@69	34	break;
marci@69	35	case 'n': //node definition
marci@69	36	if (problem=="sp") { //shortest path problem
marci@69	37	is >> i;
marci@69	38	getline(is, str);
marci@69	39	s=nodes[i];
marci@69	40	}
marci@69	41	if (problem=="max") { //max flow problem
marci@69	42	is >> i >> d;
marci@69	43	getline(is, str);
marci@69	44	if (d=='s') s=nodes[i];
marci@69	45	if (d=='t') t=nodes[i];
marci@69	46	}
marci@69	47	break;
marci@69	48	case 'a':
marci@69	49	is >> i >> j >> cap;
marci@69	50	getline(is, str);
marci@69	51	typename Graph::EdgeIt e=G.addEdge(nodes[i], nodes[j]);
alpar@105	52	capacity.update();
marci@69	53	capacity.set(e, cap);
marci@69	54	break;
marci@69	55	}
marci@69	56	}
marci@69	57	}
marci@69	58
alpar@105	59	} //namespace hugo
marci@69	60
marci@69	61	#endif //DIMACS_HH

author	jacint
	Wed, 05 May 2004 17:23:04 +0000
changeset 534	22ce98f7d0f1
parent 105	a3c73e9b9b2e
permissions	-rw-r--r--