{"id":353,"date":"2006-06-02T15:06:16","date_gmt":"2006-06-02T07:06:16","guid":{"rendered":"http:\/\/fdream.net\/blog\/article\/353.aspx"},"modified":"2006-06-02T17:06:46","modified_gmt":"2006-06-02T09:06:46","slug":"24%e7%82%b9%e7%9a%84%e4%b8%89%e7%a7%8d%e7%ae%97%e6%b3%95%e6%80%9d%e8%b7%af%e5%8f%8a%e4%bb%a3%e7%a0%81(1)","status":"publish","type":"post","link":"https:\/\/fdream.net\/blog\/article\/353","title":{"rendered":"24\u70b9\u7684\u4e09\u79cd\u7b97\u6cd5\u601d\u8def\u53ca\u4ee3\u7801(1)"},"content":{"rendered":"

\u6628\u5929\u665a\u4e0a\u5728\u5bdd\u5ba4\u91cc\u89c9\u5f97\u65e0\u804a\uff0c\u4e8e\u662f\u5c31\u73a9\u8fd9\u4e2a24\u70b9\u6e38\u620f\uff0c\u4e0a\u7f51\u641c\u4e86\u534a\u5929\uff0c\u5c31\u4e00\u4e2a\u4ee3\u7801\u662f\u6b63\u786e\u7684\uff0c\u800c\u4e14\u53ea\u80fd\u7ed9\u51fa\u4e00\u4e2a\u89e3\uff0c\u4e8e\u662f\u53ea\u597d\u81ea\u5df1\u5199\u54af\uff0c\u53c2\u8003\u4e86\u7f51\u4e0a\u73b0\u6709\u7684\u4e00\u4e9b\u7b97\u6cd5^_^<\/p>\n

\u5148\u7b80\u5355\u4ecb\u7ecd\u4e00\u4e0b24\u70b9\u6e38\u620f\uff1a
\u7ed9\u51fa4\u4e2a1-9\u4e4b\u95f4\u7684\u81ea\u7136\u6570\uff0c\u5176\u4e2d\u6bcf\u4e2a\u6570\u5b57\u53ea\u80fd\u4f7f\u7528\u4e00\u6b21\uff1b\u4efb\u610f\u4f7f\u7528 + – * \/ ( ) \uff0c\u6784\u9020\u51fa\u4e00\u4e2a\u8868\u8fbe\u5f0f\uff0c\u4f7f\u5f97\u6700\u7ec8\u7ed3\u679c\u4e3a24\uff0c\u8fd9\u5c31\u662f\u5e38\u89c1\u7684\u7b9724\u70b9\u7684\u6e38\u620f\u3002\u6bd4\u5982\u4e24\u9053\u6bd4\u8f83\u7ecf\u5178\u7684\u9898\u76ee\uff1a1\uff0c5\uff0c5\uff0c5\u548c3\uff0c3\uff0c8\uff0c8\uff0c\u5148\u81ea\u5df1\u8bd5\u8bd5\uff0c\u7b54\u6848\u8d34\u5728\u6587\u7ae0\u6700\u540e^_^<\/b><\/p>\n

\u6b64\u6587\u6240\u8d34\u4ee3\u7801\u5747\u4e3a\u9762\u5411\u8fc7\u7a0b\u7684C(++)\u4ee3\u7801\uff0c\u5728VC6\u4e0b\u7f16\u8bd1\u901a\u8fc7\u3002<\/p>\n

\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u4e00\u822c\u4f7f\u7528\u7a77\u4e3e\u6cd5\uff0c\u5373\u7a77\u4e3e4\u4e2a\u6574\u6570\u6240\u6709\u53ef\u80fd\u7684\u8868\u8fbe\u5f0f\uff0c\u7136\u540e\u5bf9\u8868\u8fbe\u5f0f\u6c42\u503c\u3002\u4e0b\u9762\u7684\u4e24\u79cd\u601d\u8def\uff08\u4e09\u79cd\u7b97\u6cd5\uff09\u5747\u662f\u57fa\u4e8e\u7a77\u4e3e\u6cd5\uff0c\u5404\u6709\u4f18\u52a3\u3002<\/p>\n

\u7b2c\u4e00\u79cd\u601d\u8def\uff1a<\/b>
\u628a\u591a\u5143\u8fd0\u7b97\u8f6c\u5316\u4e3a\u4e24\u5143\u8fd0\u7b97\uff0c\u5148\u4ece\u56db\u4e2a\u6570\u4e2d\u53d6\u51fa\u4e24\u4e2a\u6570\u8fdb\u884c\u8fd0\u7b97\uff0c\u7136\u540e\u628a\u8fd0\u7b97\u7ed3\u679c\u548c\u7b2c\u4e09\u4e2a\u6570\u8fdb\u884c\u8fd0\u7b97\uff0c\u518d\u628a\u7ed3\u679c\u4e0e\u7b2c\u56db\u4e2a\u6570\u8fdb\u884c\u8fd0\u7b97\u3002\u5728\u6c42\u8868\u8fbe\u5f0f\u7684\u8fc7\u7a0b\u4e2d\uff0c\u6700\u96be\u5904\u7406\u7684\u5c31\u662f\u5bf9\u62ec\u53f7\u7684\u5904\u7406\uff0c\u800c\u8fd9\u79cd\u601d\u8def\u5f88\u597d\u7684\u907f\u514d\u4e86\u5bf9\u62ec\u53f7\u7684\u5904\u7406\u3002\u57fa\u4e8e\u8fd9\u79cd\u601d\u8def\u6709\u4e24\u79cd\u7b97\u6cd5\uff1a<\/p>\n

\u7b2c\u4e00\u79cd\u7b97\u6cd5\uff1a
(1) \u5c064\u4e2a\u6574\u6570\u653e\u5165\u6570\u7ec4\u4e2d\uff0c
(2) \u5728\u6570\u7ec4\u4e2d\u53d6\u4e24\u4e2a\u6570\u5b57\u7684\u6392\u5217\uff0c\u5171\u6709 P(4,2) \u79cd\u6392\u5217\u3002\u5bf9\u6bcf\u4e00\u4e2a\u6392\u5217\uff0c
(2.1) \u5bf9 + – * \/ \u6bcf\u4e00\u4e2a\u8fd0\u7b97\u7b26\uff0c
(2.1.1) \u6839\u636e\u6b64\u6392\u5217\u7684\u4e24\u4e2a\u6570\u5b57\u548c\u8fd0\u7b97\u7b26\uff0c\u8ba1\u7b97\u7ed3\u679c\uff0c
(2.1.2) \u6539\u8868\u6570\u7ec4\uff1a\u5c06\u6b64\u6392\u5217\u7684\u4e24\u4e2a\u6570\u5b57\u4ece\u6570\u7ec4\u4e2d\u53bb\u9664\u6389\uff0c\u5c06 2.1.1 \u8ba1\u7b97\u7684\u7ed3\u679c\u653e\u5165\u6570\u7ec4\u4e2d\uff0c
(2.1.3) \u5bf9\u65b0\u7684\u6570\u7ec4\uff0c\u91cd\u590d\u6b65\u9aa4 2\uff0c
(2.1.4) \u6062\u590d\u6570\u7ec4\uff1a\u5c06\u6b64\u6392\u5217\u7684\u4e24\u4e2a\u6570\u5b57\u52a0\u5165\u6570\u7ec4\u4e2d\uff0c\u5c06 2.1.1 \u8ba1\u7b97\u7684\u7ed3\u679c\u4ece\u6570\u7ec4\u4e2d\u53bb\u9664\u6389\u3002<\/p>\n

\u53ef\u4ee5\u770b\u51fa\uff0c\u6b65\u9aa42\u662f\u4e00\u4e2a\u9012\u5f52\u51fd\u6570\u3002\u5f53\u6570\u7ec4\u4e2d\u53ea\u5269\u4e0b\u4e00\u4e2a\u6570\u5b57\u7684\u65f6\u5019\uff0c\u8fd9\u5c31\u662f\u8868\u8fbe\u5f0f\u7684\u6700\u7ec8\u7ed3\u679c\uff0c\u6b64\u65f6\u9012\u5f52\u7ed3\u675f\u3002<\/p>\n

\u8fd9\u4e2a\u662f\u7a0b\u5e8f\u4ee3\u7801\uff0c\u6e90\u4ee3\u7801\u4e3acsdn \u7b97\u6cd5\u8bba\u575b\u524d\u7248\u4e3b\u6d77\u661f\u6240\u4f5c\uff0c\u6211\u4fee\u6539\u4e86\u90e8\u5206\u53d8\u91cf\u3002\u6b64\u7a0b\u5e8f\u53ea\u80fd\u6c42\u51fa\u7b2c\u4e00\u4e2a\u89e3\uff0c\u65e0\u6cd5\u6c42\u51fa\u5168\u89e3\u3002
[quote]
#include
#include
#include<\/p>\n

using namespace std;<\/p>\n

const double PRECISION = 1E-6;
const int COUNT = 4;
const int RESULT = 24;<\/p>\n

double number[COUNT];\t\t\/\/\u8fd9\u91cc\u4e00\u5b9a\u8981\u7528double,\u770b\u770b\u7b2c\u4e00\u9898\u7684\u7b54\u6848\u5c31\u77e5\u9053\u4e3a\u4ec0\u4e48\u4e86\t
string expression[COUNT];\t\/\/\u4fdd\u5b58\u8868\u8fbe\u5f0f<\/p>\n

bool Test(int n){
\t\/\/\u9012\u5f52\u7ed3\u675f
\tif(n==1){
\t\tif(fabs(number[0]-RESULT)\t\t\tcout<\t\t\treturn true;
\t\t}
\t\telse
\t\t\treturn false;
\t}<\/p>\n

\t\/\/\u9012\u5f52\u8fc7\u7a0b
\tfor(int i=0;i\t\tfor(int j=i+1;j\t\t\tdouble a,b;
\t\t\tstring expa,expb;<\/p>\n

\t\t\ta=number[i];
\t\t\tb=number[j];
\t\t\tnumber[j]=number[n-1];<\/p>\n

\t\t\texpa=expression[i];
\t\t\texpb=expression[j];
\t\t\texpression[j]=expression[n-1];<\/p>\n

\t\t\texpression[i]='(‘+expa+’+’+expb+’)’;
\t\t\tnumber[i]=a+b;
\t\t\tif(Test(n-1))
\t\t\t\treturn true;<\/p>\n

\t\t\t\/\/\u51cf\u53f7\u6709\u4e24\u79cd\u60c5\u51b5,a-b\u4e0eb-a
\t\t\texpression[i]='(‘+expa+’-‘+expb+’)’;
\t\t\tnumber[i]=a-b;
\t\t\tif(Test(n-1))
\t\t\t\treturn true;<\/p>\n

\t\t\texpression[i]='(‘+expb+’-‘+expa+’)’;
\t\t\tnumber[i]=b-a;
\t\t\tif(Test(n-1))
\t\t\t\treturn true;<\/p>\n

\t\t\texpression[i]='(‘+expa+’*’+expb+’)’;
\t\t\tnumber[i]=a*b;
\t\t\tif(Test(n-1))
\t\t\t\treturn true;<\/p>\n

\t\t\t\/\/\u9664\u6cd5\u4e5f\u6709\u4e24\u79cd\u60c5\u51b5,a\/b\u4e0eb\/a
\t\t\tif(b!=0){
\t\t\t\texpression[i]='(‘+expa+’\/’+expb+’)’;
\t\t\t\tnumber[i]=a\/b;
\t\t\t\tif(Test(n-1))
\t\t\t\t\treturn true;
\t\t\t}<\/p>\n

\t\t\tif(a!=0){
\t\t\t\texpression[i]='(‘+expb+’\/’+expa+’)’;
\t\t\t\tnumber[i]=b\/a;
\t\t\t\tif(Test(n-1))
\t\t\t\t\treturn true;
\t\t\t}<\/p>\n

\t\t\t\/\/\u6062\u590d\u6570\u7ec4
\t\t\tnumber[i]=a;
\t\t\tnumber[j]=b;
\t\t\texpression[i]=expa;
\t\t\texpression[j]=expb;
\t\t}
\t}
\treturn false;
}<\/p>\n

void main(void){
\tfor(int i=0;i\t\tchar buffer[20];
\t\tint x;
\t\tcin >> x;
\t\tnumber[i]=x;
\t\titoa(x,buffer,10);
\t\texpression[i]=buffer;
\t}<\/p>\n

\tif(Test(COUNT))
\t\tco t ” cc s” < dl
\t se \t\t ut < ai < en ;\n\n \/quote]<\/p>\n

\u7cfb\u5217\u6587\u7ae0\uff1a
24\u70b9\u7684\u4e09\u79cd\u7b97\u6cd5\u601d\u8def\u53ca\u4ee3\u7801(1)<\/a>
24\u70b9\u7684\u4e09\u79cd\u7b97\u6cd5\u601d\u8def\u53ca\u4ee3\u7801(2)<\/a>
24\u70b9\u7684\u4e09\u79cd\u7b97\u6cd5\u601d\u8def\u53ca\u4ee3\u7801(3)<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

\u6628\u5929\u665a\u4e0a\u5728\u5bdd\u5ba4\u91cc\u89c9\u5f97\u65e0\u804a\uff0c\u4e8e\u662f\u5c31\u73a9\u8fd9\u4e2a24\u70b9\u6e38\u620f\uff0c\u4e0a\u7f51\u641c\u4e86\u534a\u5929\uff0c\u5c31\u4e00\u4e2a\u4ee3\u7801\u662f\u6b63\u786e\u7684\uff0c\u800c\u4e14\u53ea\u80fd\u7ed9\u51fa\u4e00\u4e2a\u89e3\uff0c\u4e8e\u662f\u53ea\u597d\u81ea\u5df1\u5199\u54af\uff0c\u53c2\u8003\u4e86\u7f51\u4e0a\u73b0\u6709\u7684\u4e00\u4e9b\u7b97\u6cd5^_^ \u5148\u7b80\u5355\u4ecb\u7ecd\u4e00\u4e0b24\u70b9\u6e38\u620f\uff1a\u7ed9\u51fa4\u4e2a1-9\u4e4b\u95f4\u7684\u81ea\u7136\u6570\uff0c\u5176\u4e2d\u6bcf\u4e2a\u6570\u5b57\u53ea\u80fd\u4f7f\u7528\u4e00\u6b21\uff1b\u4efb\u610f\u4f7f\u7528 + – * \/ ( ) \uff0c\u6784\u9020\u51fa\u4e00\u4e2a\u8868\u8fbe\u5f0f\uff0c\u4f7f\u5f97\u6700\u7ec8\u7ed3\u679c\u4e3a24\uff0c\u8fd9\u5c31\u662f\u5e38\u89c1\u7684\u7b9724\u70b9\u7684\u6e38\u620f\u3002\u6bd4\u5982\u4e24\u9053\u6bd4\u8f83\u7ecf\u5178\u7684\u9898\u76ee\uff1a1\uff0c5\uff0c5\uff0c5\u548c3\uff0c3\uff0c8\uff0c8\uff0c\u5148\u81ea\u5df1\u8bd5\u8bd5\uff0c\u7b54\u6848\u8d34\u5728\u6587\u7ae0\u6700\u540e^_^ \u6b64\u6587\u6240\u8d34\u4ee3\u7801\u5747\u4e3a\u9762\u5411\u8fc7\u7a0b\u7684C(++)\u4ee3\u7801\uff0c\u5728VC6\u4e0b\u7f16\u8bd1\u901a\u8fc7\u3002 \u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u4e00\u822c\u4f7f\u7528\u7a77\u4e3e\u6cd5\uff0c\u5373\u7a77\u4e3e4\u4e2a\u6574\u6570\u6240\u6709\u53ef\u80fd\u7684\u8868\u8fbe\u5f0f\uff0c\u7136\u540e\u5bf9\u8868\u8fbe\u5f0f\u6c42\u503c\u3002\u4e0b\u9762\u7684\u4e24\u79cd\u601d\u8def\uff08\u4e09\u79cd\u7b97\u6cd5\uff09\u5747\u662f\u57fa\u4e8e\u7a77\u4e3e\u6cd5\uff0c\u5404\u6709\u4f18\u52a3\u3002 \u7b2c\u4e00\u79cd\u601d\u8def\uff1a\u628a\u591a\u5143\u8fd0\u7b97\u8f6c\u5316\u4e3a\u4e24\u5143\u8fd0\u7b97\uff0c\u5148\u4ece\u56db\u4e2a\u6570\u4e2d\u53d6\u51fa\u4e24\u4e2a\u6570\u8fdb\u884c\u8fd0\u7b97\uff0c\u7136\u540e\u628a\u8fd0\u7b97\u7ed3\u679c\u548c\u7b2c\u4e09\u4e2a\u6570\u8fdb\u884c\u8fd0\u7b97\uff0c\u518d\u628a\u7ed3\u679c\u4e0e\u7b2c\u56db\u4e2a\u6570\u8fdb\u884c\u8fd0\u7b97\u3002\u5728\u6c42\u8868\u8fbe\u5f0f\u7684\u8fc7\u7a0b\u4e2d\uff0c\u6700\u96be\u5904\u7406\u7684\u5c31\u662f\u5bf9\u62ec\u53f7\u7684\u5904\u7406\uff0c\u800c\u8fd9\u79cd\u601d\u8def\u5f88\u597d\u7684\u907f\u514d\u4e86\u5bf9\u62ec\u53f7\u7684\u5904\u7406\u3002\u57fa\u4e8e\u8fd9\u79cd\u601d\u8def\u6709\u4e24\u79cd\u7b97\u6cd5\uff1a \u7b2c\u4e00\u79cd\u7b97\u6cd5\uff1a(1) \u5c064\u4e2a\u6574\u6570\u653e\u5165\u6570\u7ec4\u4e2d\uff0c(2) \u5728\u6570\u7ec4\u4e2d\u53d6\u4e24\u4e2a\u6570\u5b57\u7684\u6392\u5217\uff0c\u5171\u6709 P(4,2) \u79cd\u6392\u5217\u3002\u5bf9\u6bcf\u4e00\u4e2a\u6392\u5217\uff0c(2.1) \u5bf9 + – * \/ \u6bcf\u4e00\u4e2a\u8fd0\u7b97\u7b26\uff0c(2.1.1) \u6839\u636e\u6b64\u6392\u5217\u7684\u4e24\u4e2a\u6570\u5b57\u548c\u8fd0\u7b97\u7b26\uff0c\u8ba1\u7b97\u7ed3\u679c\uff0c(2.1.2) \u6539\u8868\u6570\u7ec4\uff1a\u5c06\u6b64\u6392\u5217\u7684\u4e24\u4e2a\u6570\u5b57\u4ece\u6570\u7ec4\u4e2d\u53bb\u9664\u6389\uff0c\u5c06 2.1.1 \u8ba1\u7b97\u7684\u7ed3\u679c\u653e\u5165\u6570\u7ec4\u4e2d\uff0c(2.1.3) \u5bf9\u65b0\u7684\u6570\u7ec4\uff0c\u91cd\u590d\u6b65\u9aa4 2\uff0c(2.1.4) \u6062\u590d\u6570\u7ec4\uff1a\u5c06\u6b64\u6392\u5217\u7684\u4e24\u4e2a\u6570\u5b57\u52a0\u5165\u6570\u7ec4\u4e2d\uff0c\u5c06 2.1.1 \u8ba1\u7b97\u7684\u7ed3\u679c\u4ece\u6570\u7ec4\u4e2d\u53bb\u9664\u6389\u3002 \u53ef\u4ee5\u770b\u51fa\uff0c\u6b65\u9aa42\u662f\u4e00\u4e2a\u9012\u5f52\u51fd\u6570\u3002\u5f53\u6570\u7ec4\u4e2d\u53ea\u5269\u4e0b\u4e00\u4e2a\u6570\u5b57\u7684\u65f6\u5019\uff0c\u8fd9\u5c31\u662f\u8868\u8fbe\u5f0f\u7684\u6700\u7ec8\u7ed3\u679c\uff0c\u6b64\u65f6\u9012\u5f52\u7ed3\u675f\u3002 \u8fd9\u4e2a\u662f\u7a0b\u5e8f\u4ee3\u7801\uff0c\u6e90\u4ee3\u7801\u4e3acsdn \u7b97\u6cd5\u8bba\u575b\u524d\u7248\u4e3b\u6d77\u661f\u6240\u4f5c\uff0c\u6211\u4fee\u6539\u4e86\u90e8\u5206\u53d8\u91cf\u3002\u6b64\u7a0b\u5e8f\u53ea\u80fd\u6c42\u51fa\u7b2c\u4e00\u4e2a\u89e3\uff0c\u65e0\u6cd5\u6c42\u51fa\u5168\u89e3\u3002[quote]#include #include #include using namespace std; const double PRECISION = 1E-6;const int COUNT = 4;const int RESULT = 24; double number[COUNT]; … <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[212,211],"class_list":["post-353","post","type-post","status-publish","format-standard","hentry","category-coding","tag-212","tag-211"],"views":30741,"_links":{"self":[{"href":"https:\/\/fdream.net\/blog\/wp-json\/wp\/v2\/posts\/353","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fdream.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fdream.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fdream.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fdream.net\/blog\/wp-json\/wp\/v2\/comments?post=353"}],"version-history":[{"count":0,"href":"https:\/\/fdream.net\/blog\/wp-json\/wp\/v2\/posts\/353\/revisions"}],"wp:attachment":[{"href":"https:\/\/fdream.net\/blog\/wp-json\/wp\/v2\/media?parent=353"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fdream.net\/blog\/wp-json\/wp\/v2\/categories?post=353"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fdream.net\/blog\/wp-json\/wp\/v2\/tags?post=353"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}