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RiverCrossing_Solver_1.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>River Crossing Puzzle</title>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/17.0.2/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/17.0.2/umd/react-dom.production.min.js"></script>
<style>
body { font-family: Arial, sans-serif; }
.p-4 { padding: 1rem; }
.bg-white { background-color: white; }
.rounded-xl { border-radius: 1rem; }
.shadow-md { box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1); }
.max-w-md { max-width: 28rem; margin: auto; }
.text-2xl { font-size: 1.5rem; }
.font-bold { font-weight: bold; }
.flex { display: flex; }
.justify-between { justify-content: space-between; }
.w-1/3 { width: 33.33%; }
.w-1/4 { width: 25%; }
.bg-green-100 { background-color: #d1fae5; }
.bg-blue-100 { background-color: #bfdbfe; }
</style>
</head>
<body>
<div id="root"></div>
<script type="text/javascript">
const initialState = {
'Cabbage': 'west',
'Goat': 'west',
'Wolf': 'west',
'Farmer': 'west'
};
const goalState = {
'Cabbage': 'east',
'Goat': 'east',
'Wolf': 'east',
'Farmer': 'east'
};
const areStatesEqual = (state1, state2) => {
return JSON.stringify(state1) === JSON.stringify(state2);
};
const isValid = (state) => {
if (state['Goat'] === state['Cabbage'] && state['Farmer'] !== state['Goat']) return false;
if (state['Wolf'] === state['Cabbage'] && state['Farmer'] !== state['Wolf']) return false;
return true;
};
const getNextStates = (state) => {
const nextStates = [];
const farmerSide = state['Farmer'];
const oppositeSide = farmerSide === 'west' ? 'east' : 'west';
const newState = { ...state, 'Farmer': oppositeSide };
if (isValid(newState)) nextStates.push(newState);
['Cabbage', 'Goat', 'Wolf'].forEach(item => {
if (state[item] === farmerSide) {
const itemState = { ...state, 'Farmer': oppositeSide, [item]: oppositeSide };
if (isValid(itemState)) nextStates.push(itemState);
}
});
return nextStates;
};
const backtrack = (state, path, visited) => {
if (areStatesEqual(state, goalState)) {
return path;
}
const stateKey = JSON.stringify(state);
if (visited.has(stateKey)) return null;
visited.add(stateKey);
for (const nextState of getNextStates(state)) {
const result = backtrack(nextState, [...path, nextState], visited);
if (result) return result;
}
visited.delete(stateKey);
return null;
};
const solvePuzzle = () => {
const visited = new Set();
return backtrack(initialState, [initialState], visited);
};
class RiverCrossingPuzzle extends React.Component {
constructor(props) {
super(props);
this.state = {
currentState: initialState,
solution: [],
step: 0,
message: '',
isSolving: false
};
this.move = this.move.bind(this);
this.solvePuzzleHandler = this.solvePuzzleHandler.bind(this);
this.resetPuzzle = this.resetPuzzle.bind(this);
this.nextStep = this.nextStep.bind(this);
}
move(item) {
if (item !== 'Farmer' && this.state.currentState[item] !== this.state.currentState['Farmer']) {
this.setState({ message: "The farmer must be with the item to move it!" });
return;
}
const newState = {
...this.state.currentState,
[item]: this.state.currentState[item] === 'west' ? 'east' : 'west',
Farmer: this.state.currentState['Farmer'] === 'west' ? 'east' : 'west'
};
if (!isValid(newState)) {
this.setState({ message: "Invalid move! The goat would eat the cabbage or the wolf would eat the cabbage." });
return;
}
this.setState({ currentState: newState, message: '' });
if (areStatesEqual(newState, goalState)) {
this.setState({ message: "Congratulations! You've solved the puzzle!" });
}
}
nextStep() {
if (this.state.step < this.state.solution.length - 1) {
this.setState(prevState => ({
step: prevState.step + 1,
currentState: prevState.solution[prevState.step + 1],
message: ''
}));
}
}
resetPuzzle() {
this.setState({
currentState: initialState,
step: 0,
message: ''
});
}
solvePuzzleHandler() {
this.setState({ isSolving: true, step: 0, currentState: initialState, message: 'Solving the puzzle...' });
const solutionSteps = solvePuzzle();
this.setState({ solution: solutionSteps || [], isSolving: false });
}
render() {
return (
<div className="p-4 max-w-md mx-auto bg-white rounded-xl shadow-md overflow-hidden md:max-w-2xl">
<h1 className="text-2xl font-bold mb-4">River Crossing Puzzle 🚣♂️🐺🐐🥬</h1>
<div className="flex justify-between mb-4">
<div className="w-1/3 bg-green-100 p-2 rounded">
<h2 className="font-bold">West Bank</h2>
{Object.entries(this.state.currentState).map(([item, bank]) => (
bank === 'west' && <div key={item} className="capitalize">{item}</div>
))}
</div>
<div className="w-1/4 bg-blue-100 p-2 rounded">
<h2 className="font-bold">River</h2>
</div>
<div className="w-1/3 bg-green-100 p-2 rounded">
<h2 className="font-bold">East Bank</h2>
{Object.entries(this.state.currentState).map(([item, bank]) => (
bank === 'east' && <div key={item} className="capitalize">{item}</div>
))}
</div>
</div>
<div className="mb-4">
<h2 className="font-bold mb-2">Move:</h2>
{['Farmer', 'Wolf', 'Goat', 'Cabbage'].map(item => (
<button
key={item}
onClick={() => this.move(item)}
className="bg-blue-500 hover:bg-blue-700 text-white font-bold py-2 px-4 rounded mr-2 mb-2"
>
{item}
</button>
))}
</div>
<button
onClick={this.nextStep}
className="bg-green-500 hover:bg-green-700 text-white font-bold py-2 px-4 rounded mr-2"
disabled={this.state.solution.length === 0}
>
Next Step
</button>
<button
onClick={this.resetPuzzle}
className="bg-red-500 hover:bg-red-700 text-white font-bold py-2 px-4 rounded mr-2"
>
Reset
</button>
<button
onClick={this.solvePuzzleHandler}
className="bg-yellow-500 hover:bg-yellow-700 text-white font-bold py-2 px-4 rounded"
>
Solve Puzzle
</button>
{this.state.message && (
<div className="mt-4 p-2 bg-yellow-100 border-l-4 border-yellow-500 text-yellow-700">
{this.state.message}
</div>
)}
<div className="mt-4">
<h2 className="font-bold">Current Step: {this.state.step + 1} / {this.state.solution.length || 1}</h2>
<p>{Object.entries(this.state.currentState).map(([item, bank]) => `${item}: ${bank}`).join(', ')}</p>
</div>
</div>
);
}
}
ReactDOM.render(<RiverCrossingPuzzle />, document.getElementById('root'));
</script>
</body>
</html>