36 lines
888 B
TypeScript
36 lines
888 B
TypeScript
export {};
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const str = require("fs").readFileSync(0,'utf8').toString().trim();
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let op: string[] = []
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let result: string = '';
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const peek = (arr: string[]): string => arr[arr.length-1];
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const opPriority = (op: string): number => {
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if(op === '+' || op === '-') return 1;
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else if(op === '*' || op === '/') return 2;
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else return 0;
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};
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for(let c of str) {
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if('A'<= c && c<='Z') result += c;
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else {
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if(c === '(') op.push(c);
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else if(c === ')') {
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while(op.length !== 0 && peek(op) != '(') {
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result += op.pop();
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}
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if(op.length !== 0) op.pop();
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}
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else {
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while(op.length !== 0 && opPriority(peek(op)) >= opPriority(c)) {
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result += op.pop();
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}
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op.push(c);
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}
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}
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}
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while(op.length !== 0) result += op.pop();
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console.log(result); |