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涓€銆侀棶棰樻弿杩?/h2>

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// 绀轰緥
evaluate("2+3*4")    // 杩斿洖 14 (鍏堢畻3*4=12锛屽啀绠?+12)
evaluate("2*3+4*5")  // 杩斿洖 26 (6+20)
evaluate("10+2*3+5") // 杩斿洖 21

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涓夈€佽В娉曪細鏍堢疮绉硶

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function evaluateExpression(expr: string): number {
    const stack: number[] = [];
    let currentNum = 0;
    let prevOperator = '+';
    
    for (let i = 0; i <= expr.length; i++) {
        const char = expr[i];
        
        // 绱Н鏁板瓧
        if (char >= '0' && char <= '9') {
            currentNum = currentNum * 10 + parseInt(char);
            continue;
        }
        
        // 閬囧埌杩愮畻绗︽垨缁撴潫锛屽鐞嗕箣鍓嶇疮绉殑鏁板瓧
        if (char === '+' || char === '*' || i === expr.length) {
            if (prevOperator === '+') {
                // 鍔犳硶锛氭暟瀛楀叆鏍堢瓑寰呮渶鍚庢眰鍜?
                stack.push(currentNum);
            } else if (prevOperator === '*') {
                // 涔樻硶锛氱珛鍗充笌鏍堥《璁＄畻
                stack.push(stack.pop()! * currentNum);
            }
            
            prevOperator = char;
            currentNum = 0;
        }
    }
    
    // 鏍堜腑鎵€鏈夋暟姹傚拰
    return stack.reduce((sum, n) => sum + n, 0);
}