sdutacm 2389 Ballot evaluation

http://acm.sdut.edu.cn/web/problem.php?action=showproblem&problemid=2389

题意：判断表达式是否成立；精度要求非常高；

代码：

#include <cstdio>
#include <iostream>
#include <cstring>
#include <cstdlib>
#include <algorithm>
using namespace std;
struct node
{
    char str[25];
    double data;
}link[55];
char s[25] = {NULL};
double ee = 1e-8;
int n = 0;
int qu = 0;
double res = 0;
void print1(int i)
{
    printf("Guess #%d was correct.\n",i);
}
void print2(int i)
{
    printf("Guess #%d was incorrect.\n",i);
}
int main()
{
  scanf("%d %d",&n,&qu);
  for(int i = 0; i < n; ++i)
  {
  scanf("%s %lf",link[i].str,&link[i].data);
  }
  int ok = 0;
  for(int k = 1; k <= qu; ++k)
  {
      scanf("%s",s);
      ok = 0;
      bool ans = 1;
      double temp = 0;
      for(int i = 0; i <n; ++i)
  if(0 == strcmp(link[i].str,s))
  {
      temp = link[i].data;
      break;
  }
  while(1)
  {
      scanf("%s ",s);
      if(0 == strcmp(s,"+"))
      {
          double tt = 0;
          scanf("%s ",s);
          for(int i = 0; i <n; ++i)
          if(0 == strcmp(link[i].str,s))
          {
              tt = link[i].data;
              break;
          }
          temp = temp +tt;
      }
      else
      if(!strcmp(s,">")||!strcmp(s,"<")||!strcmp(s,">=")||!strcmp(s,"<=")||!strcmp(s,"="))
      {
          scanf("%lf",&res)；//这后面的精度问题，也挺好的，认识了点精度的解决方法；
              if(!strcmp(s,">")) {if(temp - res > ee) print1(k); else print2(k); ok = 1;}
              else if(!strcmp(s,"<")) {if(res - temp > ee ) print1(k); else print2(k); ok = 1;}
              else if(!strcmp(s,">=")) {if(!(res - temp > ee)) print1(k); else print2(k); ok = 1;}
              else if(!strcmp(s,"<=")){if(!(temp - res > ee)) print1(k); else print2(k); ok = 1;}
              else if(!strcmp(s,"=")){if(!(temp -res > ee )&& !(res - temp > ee) )print1(k); else print2(k); ok = 1;}
      }
      if(ok)
      break;
  }
  }
  return 0;
}