Yzoi Easy Round 2_ Simplification (Simplify.c/cpp/pas)

Description

Given a polynomial, output the result of its simplification.

Input

A string that contains only the polynomial of the letter x, without parentheses and fractions, with no extra spaces.

Output

A string that, after simplifying the polynomial, outputs the items in the order of the times from large to small.

Input Sample

X^3+3*x^4-2*x^3+1-x

Output Sample

3*x^4-x^3-x+1

Hint

Each coefficient <10, the number of times <6, the number of items <20. The string length does not exceed 100.

The annoying analog code is as follows:

#include <iostream> #include <cstdio>using namespace std;const int maxn=1000+10;string s;int a[maxn],lc=1, Len;bool First=true;int Main () {//freopen ("simplify.in", "R", stdin)//freopen ("Simplify.out", "w", stdout);cin> >s;len=s.size (); if (len==1) {Cout<<s[0];return 0;} for (int i=0;i<len;i++) {if (s[i]== ' x ') {if (i==3) {if (s[0]== '-') {if (s[4]== ' ^ ') {a[s[5]-' 0 ']-=s[1]-' 0 ';} else{a[1]-=s[1]-' 0 ';} Continue;}} if (s[0]>= ' 0 ' &&s[0]<= ' 9 ' &&i==2) {if (s[3]== ' ^ ') {a[s[4]-' 0 ']+=s[0]-' 0 ';} else{a[1]+=s[0]-' 0 ';} Continue;} if (i==0)//{//a[1]++;//continue;//}if (s[i+1]== ' ^ ') {if (i==0) {a[s[i+2]-' 0 ']++;continue;} if (s[i-1]== ' * ') {if (s[i-3]== ' + ') a[s[i+2]-' 0 ']+=s[i-2]-' 0 '; else if (s[i-3]== '-') a[s[i+2]-' 0 ']-= (s[i-2]-' 0 ');} Else{if (i==0) {a[s[i+2]-' 0 ']++;continue;} if (s[i-1]== ' + ' | | s[i-1]== '-') {if (s[i-1]== '-') a[s[i+2]-' 0 ']--;elsea[s[i+2]-' 0 ']++;} else{a[s[i+2]-' 0 ']--;}} Else{if (s[i-1]== ' + ') {a[1]++;} else{a[1]--;}}} Else{if (s[i]>= ' 0 ' &&s[i]<= ' 9 ') {if (s[i-1]== ' ^ ' | | s[i+1]== ' * ') continue;a[0]+=s[i]-' 0 ';}}} for (int i=0;i<len;i++) {if (s[i]== ' ^ ') lc=max (lc,s[i+1]-' 0 ');} for (int i=lc;i>=0;i--) {if (a[i]==0) continue;if (i==0) {if (a[i]>0) {if (first) {cout<<a[i];first=false; Continue;} cout<< ' + ' <<a[i];} else{cout<< '-' <<a[i];} Continue;} if (i==1) {if (a[i]>0) {if (a[i]==1) {if (first) {cout<< "X"; first=false;continue;} cout<< "+x";} Else{if (first) {cout<<a[i]<< "*x"; first=false;continue;} cout<< "+" <<a[i]<< "*x";}} Else{if (a[i]==-1) {cout<< "-X";} else{cout<<a[i]<< "*x";}} Continue;} if (a[i]>0) {if (a[i]==1) {if (first) {cout<< "x^" <<i;first=false;continue;} else{cout<< "+x^" <<i;}} Else{if (first) {cout<<a[i]<< "*x^" <<i;first=false;continue;} else{cout<< "+" <<a[i]<< "*x^" <<i;cout<<9999999<<endl;}}} Else{if (a[i]==-1) {cout<< "-x^" <<i;} else{cout<<a[i]<< "*x^" <<i;}} cout<<endl;//for (int i=8;i>=0;i--)//cout<<a[i]<< ";//cout<<endl;//cout<<a[3]<<endl;return 0;} 

Yzoi Easy Round 2_ Simplification (Simplify.c/cpp/pas)