69 lines
1.5 KiB
C++
69 lines
1.5 KiB
C++
#include<stdio.h>
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#include<string.h>
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#include<iostream>
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#include<cmath>
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using namespace std;
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int main()
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{
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int n;
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char a[1005];
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while(scanf("%d",&n)!=EOF)
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{
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scanf("%s",a);
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int date=0,poww=0,wei=1,sum=0,cheng=1,flag=0;
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for(int i=strlen(a)-1;i>=0;i--)
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{
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if(a[i]>='0'&&a[i]<='9')
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{
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date+=(a[i]-'0')*wei;
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wei*=10;
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poww=0;
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}
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else if(a[i]=='^')
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{
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poww=wei=1;
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}
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else if(a[i]=='X'&&poww)
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{
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cheng*=pow(n*1.0,date*1.0);
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poww=date=0;
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wei=1;
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}
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else if(a[i]=='X')
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{
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cheng*=n;
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poww=0;
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wei=1;
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}
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else if(a[i]=='-')
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{
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if(date==0)
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sum-=cheng;
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else sum-=cheng*date;
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date=poww=0;
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wei=cheng=1;
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}
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else if(a[i]=='+')
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{
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if(date==0)
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sum+=cheng;
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else sum+=date*cheng;
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date=poww=0;
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wei=cheng=1;
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}
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if(i==0)
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{
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if(a[i]=='+'||a[i]=='-') continue;
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else flag=1;
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}
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}
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if(flag)
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{
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if(date==0)
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sum+=cheng;
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else sum+=date*cheng;
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}
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printf("%d\n",sum);
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}
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}
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