mirror of https://github.com/TheAlgorithms/C
96 lines
2.9 KiB
C
96 lines
2.9 KiB
C
#include <stdbool.h>
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#include <stdio.h>
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#include "Graph.h"
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// Return the number of vertices that v is
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// connected to
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int degree(Graph g, int nV, Vertex v)
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{
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int deg = 0;
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Vertex w;
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for (w = 0; w < nV; w++)
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if (adjacent(g, v, w))
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deg++;
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return deg;
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}
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// If start from vertex v, decide if the
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// graph has euler path
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bool hasEulerPath(Graph g, int nV, Vertex v, Vertex w)
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{
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if (v != w)
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{
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if (degree(g, nV, v) % 2 == 0 || degree(g, nV, w) % 2 == 0)
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return false;
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}
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else if (degree(g, nV, v) % 2 != 0)
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{
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return false;
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}
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Vertex x;
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for (x = 0; x < nV; x++)
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if (x != v && x != w && degree(g, nV, x) % 2 != 0)
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return false;
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return true;
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}
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int main(void)
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{
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Edge e;
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int n;
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printf("Enter the number of vertices: ");
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scanf("%d", &n);
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Graph g = newGraph(n);
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Vertex src, dest;
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printf("Enter source node: ");
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scanf("%d", &src);
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printf("Enter destination node: ");
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scanf("%d", &dest);
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printf("Enter an edge (from): ");
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while (scanf("%d", &e.v) == 1)
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{
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printf("Enter an edge (to): ");
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scanf("%d", &e.w);
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insertEdge(g, e);
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printf("Enter an edge (from): ");
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}
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printf("Finished.\n");
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printf("The graph has ");
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if (hasEulerPath(g, n, src, dest))
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printf("an");
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else
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printf("no");
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printf(" Euler path from %d to %d.\n", src, dest);
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freeGraph(g);
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return 0;
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}
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// By
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// .----------------. .----------------. .----------------.
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// .-----------------. .----------------. .----------------.
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// | .--------------. || .--------------. || .--------------. ||
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// .--------------. | | .--------------. || .--------------. | | | _________ |
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// || | _____ _____ | || | __ | || | ____ _____ | | | | ____ ____
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// | || | ____ | | | | | _ _ | | || ||_ _||_ _|| || | / \
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// | || ||_ \|_ _| | | | | |_ || _| | || | .' `. | | | | |_/ | |
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// \_| | || | | | | | | || | / /\ \ | || | | \ | | | | | | |
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// |__| | | || | / .--. \ | | | | | | | || | | ' ' | | || |
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// / ____ \ | || | | |\ \| | | | | | | __ | | || | | | | | | |
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// | | _| |_ | || | \ `--' / | || | _/ / \ \_ | || | _| |_\ |_
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// | | | | _| | | |_ | || | \ `--' / | | | | |_____| | || | `.__.'
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// | || ||____| |____|| || ||_____|\____| | | | | |____||____| | || | `.____.'
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// | | | | | || | | || | | || | | | | |
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// | || | | | | '--------------' || '--------------' ||
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// '--------------' || '--------------' | | '--------------' || '--------------'
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// |
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// '----------------' '----------------' '----------------'
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// '----------------' '----------------' '----------------'
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// Email : z5261243@unsw.edu.au
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// hhoanhtuann@gmail.com
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