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Commit4c46203

Browse files
author
haotf
committed
feat: 逆波兰表达式
1 parent5205538 commit4c46203

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4 files changed

+1570
-1
lines changed

4 files changed

+1570
-1
lines changed

‎.gitignore‎

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,2 +1,3 @@
11
.vscode
2-
log
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log
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node_modules

‎150.逆波兰表达式rpn.js‎

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constisOperator=(s)=>["+","-","*","/"].includes(s);
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constparse=(expression)=>{
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consttokens=[];
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for(leti=0;i<expression.length;i++){
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lettoken="";
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if(isOperator(expression[i])&&isOperator(tokens[tokens.length-1])){
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token=expression[i];
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i++;
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}
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while(/\d/.test(expression[i])){
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token=token+expression[i];
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i++;
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}
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if(token){
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tokens.push(Number(token));
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i--;
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}else{
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if(expression[i]!==" "){
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tokens.push(expression[i]);
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}
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}
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}
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returntokens;
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};
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consttransform=(tokens)=>{
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constoperators=[];
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constresult=[];
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for(leti=0;i<tokens.length;i++){
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constele=tokens[i];
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if(typeofele==="number"){
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result.push(ele);
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}else{
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if(ele==="*"||ele==="/"||ele==="("){
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operators.push(ele);
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}elseif(operators[operators.length-1]==="("){
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operators.push(ele);
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}elseif(ele===")"){
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while(operators[operators.length-1]!=="("){
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result.push(operators.pop());
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}
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operators.pop();
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}else{
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while(operators.length>0){
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result.push(operators.pop());
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}
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operators.push(ele);
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}
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}
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}
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while(operators.length>0){
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result.push(operators.pop());
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}
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returnresult;
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};
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constcalc=(tokens)=>{
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letstack=[];
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for(leti=0;i<tokens.length;i++){
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constele=tokens[i];
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if(typeofele==="number"){
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stack.push(ele);
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}else{
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constright=stack.pop();
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constleft=stack.pop();
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switch(ele){
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case"+":
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stack.push(left+right);
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break;
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case"-":
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stack.push(left-right);
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break;
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case"*":
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stack.push(left*right);
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break;
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case"/":
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stack.push(left/right);
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break;
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}
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}
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}
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returnstack[0];
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};
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constrpn=(expression)=>{
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consttokens=parse(expression);
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constresult=transform(tokens);
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constvalue=calc(result);
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console.log(value);
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returnvalue;
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};
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rpn("12 + (7 - 3) * 2 + 9 / 3");
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rpn("((10 * (6 * ((9 + 3) * 11))) + 17) + 50");
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rpn("2 + 30 * (20 - 10) / (100 / 5)");

‎package.json‎

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{
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"name":"leetcode",
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"version":"1.0.0",
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"description":"leecode",
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"scripts": {
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"test":"echo\"Error: no test specified\" && exit 1"
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},
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"repository": {
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"type":"git",
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"url":"git+https://github.com/coderhaotf/leetcode.git"
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},
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"author":"",
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"license":"ISC",
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"bugs": {
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"url":"https://github.com/coderhaotf/leetcode/issues"
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},
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"homepage":"https://github.com/coderhaotf/leetcode#readme",
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"devDependencies": {
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"cz-conventional-changelog":"^3.3.0"
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},
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"config": {
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"commitizen": {
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"path":"./node_modules/cz-conventional-changelog"
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}
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}
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}

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