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ece650-a2.cpp~
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ece650-a2.cpp~
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#include <fstream>
#include <iostream>
#include <iterator>
#include <list>
#include <sstream>
#include <tuple>
#include <vector>
using namespace std;
template <typename Out>
void split(const std::string &s, char delim, Out result) {
std::stringstream ss;
ss.str(s);
std::string item;
while (std::getline(ss, item, delim)) {
*(result++) = item;
}
}
std::vector<std::string> split(const std::string &s, char delim) {
std::vector<std::string> elems;
split(s, delim, std::back_inserter(elems));
return elems;
}
void shortest_path(int, int, int, int);
bool build_points_from_E(int);
std::vector<int> points1;
std::vector<std::string> nums;
// std::ifstream infile("test.txt");
int main(int argc, char **argv) {
// Test code. Replaced with your code
// Print command line arguments that were used to start the program
// separator character
// read from stdin until EOF
int dp;
int sp;
int points;
unsigned num;
int length = 0;
bool flag_v = true;
bool flag_s = true;
bool flag_e = true;
while (!std::cin.eof()) {
// std::cout << "Enter numbers separated by comma: ";
std::string line;
std::getline(std::cin, line);
// cout << line << endl;
std::istringstream input(line);
if (line.size() <= 0) {
if (std::cin.eof()) {
std::cerr << "EOF\n";
} else {
std::cerr << "Error:in shortest path no input\n";
}
} else {
char ch;
input >> ch;
ws(input);
if (input.fail()) {
std::cerr << "Error:in shortest path need to parse a character\n";
}
if (ch == 'V' && flag_v) {
std::cout<<line<<std::endl;
nums.clear();
points1.clear();
// parse an integer
input >> num;
if (input.fail()) {
std::cerr << "Error:in shortest path need to parse a number\n";
break;
} else {
points = num;
flag_v = true;
}
// if eof bail out
} // end V
else if (ch == 's' && flag_s) {
// read a character
// Note that whitespace is ignored
std::vector<int> sp_dp;
while (!input.eof()) {
if (input.eof()) {
std::cerr << "Error:in shortest path Unexpected argument\n";
break;
}
// parse an integer
input >> num;
if (input.fail()) {
std::cerr << "Error:in shortest path no starting point\n";
break;
} else {
sp_dp.push_back(num);
flag_s = false;
}
}
sp = sp_dp.at(0);
dp = sp_dp.at(1);
if (sp >= points || dp >= points) {
flag_s = true;
flag_e = true;
flag_v = true;
std::cerr << "Error: in shortest path wrong input format for s\n";
} else {
shortest_path(points, length, sp, dp);
flag_s = true;
flag_e = true;
flag_v = true;
}
} // end s if
else if (ch == 'E' && flag_e) {
std::cout<<line<<std::endl;
nums = split(line, ',');
// done parsing a line, print the numbers
length = nums.size();
if (length == 1) {
std::cout
<< "Warning:Since there are no edges, no path can be in this "
"graph\n";
}
if (!nums.empty() && length != 1) {
bool flag_point = build_points_from_E(points);
if (!flag_point) {
points1.clear();
std::cerr << "Error: in shortest path wrong input for E\n";
} else
flag_e = true;
}
} else
std::cerr << "Error:in shortest path wrong input\n"<<std::flush;
}
}
}
void shortest_path(int points, int length, int sp, int dp) {
int infinity = 9999999;
int dis[points];
int flag[points];
int edg[points][points];
if (sp == dp) {
std::cout << sp << std::endl;
return;
}
if (length == 1) {
std::cout << 0 << std::endl;
}
for (int i = 0; i < points; i++) {
for (int j = 0; j < points; j++) {
if (i == j) {
edg[i][j] = 0;
} else {
edg[i][j] = infinity;
}
}
}
for (int i = 0; i < length; i = i + 2) {
edg[points1.at(i)][points1.at(i + 1)] = 1;
edg[points1.at(i + 1)][points1.at(i)] = 1;
}
// setting distance to starting point
for (int i = 0; i < points; i++) {
dis[i] = edg[sp][i];
}
// setting flag for starting point
for (int i = 0; i < points; i++) {
flag[i] = 0;
}
flag[sp] = 1;
int min, u;
std::vector<tuple<int, int>> first;
for (int i = 0; i < points - 1; i++) {
min = infinity;
for (int j = 0; j < points; j++) {
if (flag[j] == 0 && dis[j] < min) {
min = dis[j];
u = j;
}
}
std::tuple<int, int> foo(u, sp);
// int u_sp=u*10+sp;
first.emplace_back(foo);
flag[u] = 1;
for (int v = 0; v < points; v++) {
if (edg[u][v] < infinity) {
if (dis[v] > dis[u] + edg[u][v]) {
dis[v] = dis[u] + edg[u][v];
std::tuple<int, int> foo(u, v);
first.emplace_back(foo);
}
}
}
}
// int tmp=-1;
int tmp_dp = dp;
if (dis[dp] != infinity) {
std::vector<int> result;
for (std::vector<tuple<int, int>>::iterator it = first.end() - 1;
it != first.begin(); --it) {
if (std::get<1>(*it) == tmp_dp) {
// std::cout <<std::get<0>(*it)<<"->"<<std::get<1>(*it)<<std::endl;
result.emplace_back(tmp_dp);
// tmp=(*it/10);
tmp_dp = std::get<0>(*it);
// std::cout << tmp_dp<<"this is tmp_dp"<<std::endl;
}
// std::cout << ' ' <<std::get<0>(*it)<<std::get<1>(*it)<<endl;
}
// std::cout << sp<<"->"<<tmp_dp<<std::endl;
result.emplace_back(tmp_dp);
result.emplace_back(sp);
for (std::vector<int>::reverse_iterator it = result.rbegin();
it != result.rend(); ++it) {
if (it != result.rend() - 1)
std::cout << *it << "-";
else
std::cout << *it<<std::endl;
}
} else {
std::cout << "Error: there is no path";
}
}
bool build_points_from_E(int points) {
for (std::string x : nums) {
std::size_t found = x.find_first_of("E{}<>");
while (found != std::string::npos) {
x[found] = ' ';
found = x.find_first_of("E{}<>", found + 1);
}
int integer = std::stoi(x);
points1.push_back(integer);
if (integer >= points)
return false;
}
return true;
}