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            Uriel's Corner

            Research Associate @ Harvard University / Research Interests: Computer Vision, Biomedical Image Analysis, Machine Learning
            posts - 0, comments - 50, trackbacks - 0, articles - 594

            POJ 1747 Expression---遞歸

            Posted on 2009-10-03 01:36 Uriel 閱讀(629) 評論(0)  編輯 收藏 引用 所屬分類: POJ遞歸 & 分治
            暑假集訓(xùn)就看過這題,當(dāng)時(shí)不會(huì)。。今天看了下Discuss之后很有感覺。。
            加入下標(biāo)應(yīng)該不用這么麻煩。。sscanf那些神奇的東西都還不會(huì)。。就用猥瑣方法硬來了。。。- -||
            大牛們不吝指教。。加下標(biāo)那里怎么改下。。
            /*Problem: 1747  User: Uriel 
               Memory: 1184K  Time: 141MS 
               Language: C++  Result: Accepted
            */
             

            #include
            <stdio.h>
            #include
            <stdlib.h>
            #include
            <string.h>

            char str[105][10000];
            char temp[102][4]={"0","1","2","3","4","5","6","7","8","9","10","11","12","13","14","15","16","17","18","19","20","21","22","23","24","25","26","27","28","29","30",
                               
            "31","32","33","34","35","36","37","38","39","40","41","42","43","44","45","46","47","48","49","50","51","52","53","54","55","56","57","58","59","60",
                               
            "61","62","63","64","65","66","67","68","69","70","71","72","73","74","75","76","77","78","79","80","81","82","83","84","85","86","87","88","89",
                               
            "90","91","92","93","94","95","96","97","98","99","100"}
            ;
            int n,st;

            int min(int a,int b)
            {
                
            return a < b ? a: b;
            }


            void Sov(int a)
            {
                
            if(a==1)return ;
                Sov(a
            -1);
                strcpy(str[a],
            "((A");
                strcat(str[a],temp[a
            -1]);
                strcat(str[a],
            "|B");
                strcat(str[a],temp[a
            -1]);
                strcat(str[a],
            ")|(");
                strcat(str[a],str[a
            -1]);
                strcat(str[a],
            "|((A");
                strcat(str[a],temp[a
            -1]);
                strcat(str[a],
            "|A");
                strcat(str[a],temp[a
            -1]);
                strcat(str[a],
            ")|(B");
                strcat(str[a],temp[a
            -1]);
                strcat(str[a],
            "|B");
                strcat(str[a],temp[a
            -1]);
                strcat(str[a],
            "))))");
            }


            int main()
            {
                scanf(
            "%d",&n);
                memset(str,
            0x00,sizeof(str));
                strcpy(str[
            1],"((A0|B0)|(A0|B0))");
                st
            =1;
                Sov(n);
                
            for(int i=0;i<min(strlen(str[n]),50*n);i++)
                
            {
                    printf(
            "%c",str[n][i]);
                }

                printf(
            "\n");
                
            return 0;
            }


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