NoWayProject/server.py at master · dis-28/NoWayProject · GitHub

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import sys
from flask_cors import CORS, cross_origin
from collections import defaultdict
from heapq import heappush, heappop
from flask import Flask, request, jsonify, send_from_directory

app = Flask(__name__, static_folder='../frontend/build', static_url_path='')
cors = CORS(app)

cors = CORS(app, origins=['http://localhost:3000'])


@app.route('/')
def hello_world():
    return 'Landing!'


@app.route('/shortd/<int:a>/<int:b>')
def shortestPath(a, b):
    src = a
    dst = b
    graph = {
        1: {2: 262},
        2: {1: 262, 3: 330, 39: 262},
        3: {2: 330, 4: 130},
        4: {5: 200, 3: 130},
        5: {4: 200, 6: 66, 37: 157},
        6: {5: 66, 7: 131},
        7: {6: 131, 8: 66, 37: 260},
        8: {7: 66, 9: 131},
        9: {8: 131, 10: 66},
        10: {9: 66, 11: 66},
        11: {10: 66, 12: 150},
        12: {11: 150, 13: 130},
        13: {12: 130, 14: 100},
        14: {13: 100, 15: 66},
        15: {14: 66, 32: 250, 16: 140},
        16: {15: 140, 17: 200, 18: 240},
        17: {16: 200},
        18: {16: 240, 19: 52},
        19: {18: 52, 20: 175, 21: 132},
        20: {19: 175},
        21: {19: 132, 23: 60, 22: 66},
        22: {21: 66, 64: 716},
        23: {21: 60, 24: 105, 25: 200},
        24: {23: 105},
        25: {23: 200, 26: 130, 27: 160},
        26: {25: 130},
        27: {25: 160, 28: 130},
        28: {29: 200, 64: 460, 27: 130},
        29: {28: 200, 30: 20, 43: 170},
        30: {29: 20, 31: 131, 32: 200},
        31: {30: 131},
        32: {33: 109, 15: 250, 35: 130, 30: 200},
        33: {34: 60},
        34: {33: 60},
        35: {32: 130, 36: 130, 40: 130, 38: 262},
        35: {32: 130, 36: 130, 40: 130, 38: 262},
        36: {35: 130, 37: 400},
        38: {35: 262, 39: 330, 49: 380},
        39: {38: 330, 2: 262},
        40: {35: 130, 41: 80, 42: 79},
        41: {40: 80, 45: 20},
        42: {40: 79, 44: 53, 43: 92},
        43: {42: 92, 63: 105, 29: 170},
        44: {42: 53, 45: 50},
        45: {46: 105, 44: 50, 41: 20},
        46: {45: 105, 47: 100},
        47: {48: 120, 49: 100, 46: 100},
        48: {47: 120, 63: 66, 55: 250},
        49: {38: 380, 50: 91, 47: 100},
        50: {49: 91, 52: 182},
        51: {52: 40},
        52: {53: 130, 54: 130, 51: 40},
        53: {52: 130, 54: 20, 55: 130},
        54: {53: 20, 52: 130, 55: 130},
        55: {48: 250, 56: 122, 53: 130, 54: 130},
        56: {55: 122, 57: 115},
        57: {56: 115, 58: 130, 64: 250},
        59: {58: 66, 60: 66},
        60: {58: 66, 61: 66},
        61: {60: 50, 62: 30},
        62: {52: 200, 61: 30},
        63: {48: 66, 43: 105},
        64: {57: 250, 28: 460, 22: 716}
    }
    g = defaultdict(list)
    for u in graph:
        for v, wt in graph[u].items():
            g[u].append([v, wt])
            g[v].append([u, wt])

    inf = float('inf')
    n = 65  # Assuming n is the number of nodes in the graph
    distance = [inf] * (1 + n)
    distance[src] = 0
    smallest = []
    heappush(smallest, [distance[src], src])
    path = [-1] * (1 + n)

    # Dijkstra's algorithm
    while smallest:
        dis, node = heappop(smallest)
        if dis > distance[node]:
            continue
        for neigh, cost in g[node]:
            if dis + cost < distance[neigh]:
                path[neigh] = node
                distance[neigh] = dis + cost
                heappush(smallest, [distance[neigh], neigh])

    if distance[dst] == inf:
        return [-1]
    netdis = distance[dst]
    res = []
    current = dst
    ans = []
    while current > 0:
        ans.append(current)
        current = path[current]
    res.append(ans[::-1])
    res.append(netdis)
    result = {
        "from": src,
        "to": dst,
        "path": res[0],
        "totalDis": res[1]
    }
    return jsonify(result)


if __name__ == "__main__":
    app.run(debug=True)