【NOIP2005】等价表达式 – 徐亦轲的博客

选几个值带进去算一下就可以了=-=

不想写了

// <equal.cpp> - 03/06/16 14:40:52
// This file is created by XuYike's black technology automatically.
// Copyright (C) 2015 ChangJun High School, Inc.
// I don't know what this program is.

#include <iostream>
#include <vector>
#include <algorithm>
#include <cstring>
#include <cstdio>
#include <cmath>
using namespace std;
typedef long long lol;
int getint(){
	int res=0,fh=1;char ch=getchar();
	while((ch>'9'||ch<'0')&&ch!='-')ch=getchar();
	if(ch=='-')fh=-1,ch=getchar();
	while(ch>='0'&&ch<='9')res=res*10+ch-'0',ch=getchar();
	return fh*res;
}
lol check,result_t;
lol num[50],op[50];
lol power(lol a,lol b){
	lol k=1;
	for(int i=0;i<b;i++)k*=a;
	return k;
}
void cul(int p,int op){
	if(op==0)num[p-1]=num[p-1]+num[p];
	if(op==1)num[p-1]=num[p-1]-num[p];
	if(op==2)num[p-1]=num[p-1]*num[p];
	if(op==5)num[p-1]=power(num[p-1],num[p]);
}
lol result(string str){
	int op_nxt,len=str.length(),p=-1,q=-1;
	lol num_nxt=0;
	for(int i=0;i<len;i++){
		if(str[i]=='a')num[++p]=check;
		else if(str[i]>='0'&&str[i]<='9')num_nxt=num_nxt*10+(str[i]-'0');
		else if(str[i]!=' '){
			if(num_nxt!=0){
				num[++p]=num_nxt;
				num_nxt=0;
			}
			if(str[i]=='+')op_nxt=0;
			if(str[i]=='-')op_nxt=1;
			if(str[i]=='*')op_nxt=2;
			if(str[i]=='^')op_nxt=5;
			if(str[i]=='(')op_nxt=6;
			if(str[i]==')')op_nxt=7;
			if(op_nxt==6)op[++q]=op_nxt;
			else if(op_nxt==7)
				while(q>=0&&op[q--]!=6)cul(p--,op[q+1]);
			else{
				while(q>=0&&op[q]<=5&&op[q]/2>=op_nxt/2)cul(p--,op[q--]);
				op[++q]=op_nxt;
			}
		}
	}
	if(num_nxt){
		num[++p]=num_nxt;
		num_nxt=0;
	}
	while(q>=0)cul(p--,op[q--]);
	return num[0];
}
int main(){
	freopen("equal.in","r",stdin);
	freopen("equal.out","w",stdout);
	string str1,str2;
	getline(cin,str1);
	int n=getint();
	for(int i=0;i<n;i++){
		bool flag=1;
		getline(cin,str2);
		for(int i=10;i<=20;i++){
			check=i;
			if(result(str1)!=result(str2)){flag=0;break;}
		}
		if(flag)cout<<(char)('A'+i);
	}
	return 0;
}

// <equal.cpp> - 03/06/16 14:40:52

// This file is created by XuYike's black technology automatically.

// I don't know what this program is.

#include <iostream>

#include <vector>

#include <algorithm>

#include <cstring>

#include <cstdio>

#include <cmath>

using namespace std;

typedef long long lol;

int getint(){

int res=0,fh=1;char ch=getchar();

while((ch>'9'||ch<'0')&&ch!='-')ch=getchar();

if(ch=='-')fh=-1,ch=getchar();

while(ch>='0'&&ch<='9')res=res*10+ch-'0',ch=getchar();

return fh*res;

}

lol check,result_t;

lol num[50],op[50];

lol power(lol a,lol b){

lol k=1;

for(int i=0;i<b;i++)k*=a;

return k;

}

void cul(int p,int op){

if(op==0)num[p-1]=num[p-1]+num[p];

if(op==1)num[p-1]=num[p-1]-num[p];

if(op==2)num[p-1]=num[p-1]*num[p];

if(op==5)num[p-1]=power(num[p-1],num[p]);

}

lol result(string str){

int op_nxt,len=str.length(),p=-1,q=-1;

lol num_nxt=0;

for(int i=0;i<len;i++){

if(str[i]=='a')num[++p]=check;

else if(str[i]>='0'&&str[i]<='9')num_nxt=num_nxt*10+(str[i]-'0');

else if(str[i]!=' '){

if(num_nxt!=0){

num[++p]=num_nxt;

num_nxt=0;

}

if(str[i]=='+')op_nxt=0;

if(str[i]=='-')op_nxt=1;

if(str[i]=='*')op_nxt=2;

if(str[i]=='^')op_nxt=5;

if(str[i]=='(')op_nxt=6;

if(str[i]==')')op_nxt=7;

if(op_nxt==6)op[++q]=op_nxt;

else if(op_nxt==7)

while(q>=0&&op[q--]!=6)cul(p--,op[q+1]);

else{

while(q>=0&&op[q]<=5&&op[q]/2>=op_nxt/2)cul(p--,op[q--]);

op[++q]=op_nxt;

}

if(num_nxt){

num[++p]=num_nxt;

num_nxt=0;

}

while(q>=0)cul(p--,op[q--]);

return num[0];

}

int main(){

freopen("equal.in","r",stdin);

freopen("equal.out","w",stdout);

string str1,str2;

getline(cin,str1);

int n=getint();

for(int i=0;i<n;i++){

bool flag=1;

getline(cin,str2);

for(int i=10;i<=20;i++){

check=i;

if(result(str1)!=result(str2)){flag=0;break;}

}

if(flag)cout<<(char)('A'+i);

}

return 0;

}

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