素数回文
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 7003 Accepted Submission(s): 1612
1 #include<stdio.h> 2 #include<string.h> 3 #include<stdlib.h> //ltoa函数将长整形转换成字符数组 4 5 6 7 8 __int64 num[800]={ 9 5,7, 10 11,101,131,151,181,191,313,353, 11 373,383,727,757,787,797,919,929, 12 10301,10501,10601,11311,11411,12421,12721,12821, 13 13331,13831,13931,14341,14741,15451,15551,16061, 14 16361,16561,16661,17471,17971,18181,18481,19391, 15 19891,19991,30103,30203,30403,30703,30803,31013, 16 31513,32323,32423,33533,34543,34843,35053,35153, 17 35353,35753,36263,36563,37273,37573,38083,38183, 18 38783,39293,70207,70507,70607,71317,71917,72227, 19 72727,73037,73237,73637,74047,74747,75557,76367, 20 76667,77377,77477,77977,78487,78787,78887,79397, 21 79697,79997,90709,91019,93139,93239,93739,94049, 22 94349,94649,94849,94949,95959,96269,96469,96769, 23 97379,97579,97879,98389,98689,1003001,1008001,1022201, 24 1028201,1035301,1043401,1055501,1062601,1065601,1074701,1082801, 25 1085801,1092901,1093901,1114111,1117111,1120211,1123211,1126211, 26 1129211,1134311,1145411,1150511,1153511,1160611,1163611,1175711, 27 1177711,1178711,1180811,1183811,1186811,1190911,1193911,1196911, 28 1201021,1208021,1212121,1215121,1218121,1221221,1235321,1242421, 29 1243421,1245421,1250521,1253521,1257521,1262621,1268621,1273721, 30 1276721,1278721,1280821,1281821,1286821,1287821,1300031,1303031, 31 1311131,1317131,1327231,1328231,1333331,1335331,1338331,1343431, 32 1360631,1362631,1363631,1371731,1374731,1390931,1407041,1409041, 33 1411141,1412141,1422241,1437341,1444441,1447441,1452541,1456541, 34 1461641,1463641,1464641,1469641,1486841,1489841,1490941,1496941, 35 1508051,1513151,1520251,1532351,1535351,1542451,1548451,1550551, 36 1551551,1556551,1557551,1565651,1572751,1579751,1580851,1583851, 37 1589851,1594951,1597951,1598951,1600061,1609061,1611161,1616161, 38 1628261,1630361,1633361,1640461,1643461,1646461,1654561,1657561, 39 1658561,1660661,1670761,1684861,1685861,1688861,1695961,1703071, 40 1707071,1712171,1714171,1730371,1734371,1737371,1748471,1755571, 41 1761671,1764671,1777771,1793971,1802081,1805081,1820281,1823281, 42 1824281,1826281,1829281,1831381,1832381,1842481,1851581,1853581, 43 1856581,1865681,1876781,1878781,1879781,1880881,1881881,1883881, 44 1884881,1895981,1903091,1908091,1909091,1917191,1924291,1930391, 45 1936391,1941491,1951591,1952591,1957591,1958591,1963691,1968691, 46 1969691,1970791,1976791,1981891,1982891,1984891,1987891,1988891, 47 1993991,1995991,1998991,3001003,3002003,3007003,3016103,3026203, 48 3064603,3065603,3072703,3073703,3075703,3083803,3089803,3091903, 49 3095903,3103013,3106013,3127213,3135313,3140413,3155513,3158513, 50 3160613,3166613,3181813,3187813,3193913,3196913,3198913,3211123, 51 3212123,3218123,3222223,3223223,3228223,3233323,3236323,3241423, 52 3245423,3252523,3256523,3258523,3260623,3267623,3272723,3283823, 53 3285823,3286823,3288823,3291923,3293923,3304033,3305033,3307033, 54 3310133,3315133,3319133,3321233,3329233,3331333,3337333,3343433, 55 3353533,3362633,3364633,3365633,3368633,3380833,3391933,3392933, 56 3400043,3411143,3417143,3424243,3425243,3427243,3439343,3441443, 57 3443443,3444443,3447443,3449443,3452543,3460643,3466643,3470743, 58 3479743,3485843,3487843,3503053,3515153,3517153,3528253,3541453, 59 3553553,3558553,3563653,3569653,3586853,3589853,3590953,3591953, 60 3594953,3601063,3607063,3618163,3621263,3627263,3635363,3643463, 61 3646463,3670763,3673763,3680863,3689863,3698963,3708073,3709073, 62 3716173,3717173,3721273,3722273,3728273,3732373,3743473,3746473, 63 3762673,3763673,3765673,3768673,3769673,3773773,3774773,3781873, 64 3784873,3792973,3793973,3799973,3804083,3806083,3812183,3814183, 65 3826283,3829283,3836383,3842483,3853583,3858583,3863683,3864683, 66 3867683,3869683,3871783,3878783,3893983,3899983,3913193,3916193, 67 3918193,3924293,3927293,3931393,3938393,3942493,3946493,3948493, 68 3964693,3970793,3983893,3991993,3994993,3997993,3998993,7014107, 69 7035307,7036307,7041407,7046407,7057507,7065607,7069607,7073707, 70 7079707,7082807,7084807,7087807,7093907,7096907,7100017,7114117, 71 7115117,7118117,7129217,7134317,7136317,7141417,7145417,7155517, 72 7156517,7158517,7159517,7177717,7190917,7194917,7215127,7226227, 73 7246427,7249427,7250527,7256527,7257527,7261627,7267627,7276727, 74 7278727,7291927,7300037,7302037,7310137,7314137,7324237,7327237, 75 7347437,7352537,7354537,7362637,7365637,7381837,7388837,7392937, 76 7401047,7403047,7409047,7415147,7434347,7436347,7439347,7452547, 77 7461647,7466647,7472747,7475747,7485847,7486847,7489847,7493947, 78 7507057,7508057,7518157,7519157,7521257,7527257,7540457,7562657, 79 7564657,7576757,7586857,7592957,7594957,7600067,7611167,7619167, 80 7622267,7630367,7632367,7644467,7654567,7662667,7665667,7666667, 81 7668667,7669667,7674767,7681867,7690967,7693967,7696967,7715177, 82 7718177,7722277,7729277,7733377,7742477,7747477,7750577,7758577, 83 7764677,7772777,7774777,7778777,7782877,7783877,7791977,7794977, 84 7807087,7819187,7820287,7821287,7831387,7832387,7838387,7843487, 85 7850587,7856587,7865687,7867687,7868687,7873787,7884887,7891987, 86 7897987,7913197,7916197,7930397,7933397,7935397,7938397,7941497, 87 7943497,7949497,7957597,7958597,7960697,7977797,7984897,7985897, 88 7987897,7996997,9002009,9015109,9024209,9037309,9042409,9043409, 89 9045409,9046409,9049409,9067609,9073709,9076709,9078709,9091909, 90 9095909,9103019,9109019,9110119,9127219,9128219,9136319,9149419, 91 9169619,9173719,9174719,9179719,9185819,9196919,9199919,9200029, 92 9209029,9212129,9217129,9222229,9223229,9230329,9231329,9255529, 93 9269629,9271729,9277729,9280829,9286829,9289829,9318139,9320239, 94 9324239,9329239,9332339,9338339,9351539,9357539,9375739,9384839, 95 9397939,9400049,9414149,9419149,9433349,9439349,9440449,9446449, 96 9451549,9470749,9477749,9492949,9493949,9495949,9504059,9514159, 97 9526259,9529259,9547459,9556559,9558559,9561659,9577759,9583859, 98 9585859,9586859,9601069,9602069,9604069,9610169,9620269,9624269, 99 9626269,9632369,9634369,9645469,9650569,9657569,9670769,9686869, 100 9700079,9709079,9711179,9714179,9724279,9727279,9732379,9733379, 101 9743479,9749479,9752579,9754579,9758579,9762679,9770779,9776779, 102 9779779,9781879,9782879,9787879,9788879,9795979,9801089,9807089, 103 9809089,9817189,9818189,9820289,9822289,9836389,9837389,9845489, 104 9852589,9871789,9888889,9889889,9896989,9902099,9907099,9908099, 105 9916199,9918199,9919199,9921299,9923299,9926299,9927299,9931399, 106 9932399,9935399,9938399,9957599,9965699,9978799,9980899,9981899, 107 9989899, 108 }; 109 110 int main() 111 { 112 __int64 a,b; 113 int i,j; 114 while(~scanf("%I64d%I64d",&a,&b)) 115 { 116 for(i=0;num[i]<=9989899;i++) 117 { 118 if(num[i]>=a) 119 break; 120 } 121 for(j=i;num[j]<=9989899;j++) 122 { 123 if(num[j]<=b&&num[j]!=0) 124 printf("%I64d\n",num[j]); 125 else 126 break; 127 } 128 printf("\n"); 129 } 130 return 0; 131 } 132 133 134 /* 普通素数筛选法 135 bool prime[100000003]; 136 void isprime() 137 { 138 __int64 i,j; 139 memset(prime,0,sizeof(prime)); 140 for(i=2;i<=100000001;i++) 141 { 142 if(!prime[i]) 143 for(j=i*i;j<=100000001;j+=i) 144 prime[j]=1; 145 } 146 } 147 */ 148 /* 149 int main() 150 { 151 __int64 a,b; 152 __int64 i; 153 isprime(); 154 int cnt=0; 155 while(~scanf("%I64d%I64d",&a,&b)) 156 { 157 for(i=11;i<=100000001;i++) 158 { 159 if(!prime[i]) 160 { 161 162 char str[10]; 163 ltoa(i,str,10); 164 int len=strlen(str); 165 bool flag=true; 166 for(int j=0;j<len;j++) 167 { 168 if(str[len-j-1]!=str[j]) 169 { 170 flag=false; 171 break; 172 } 173 } 174 if(flag) 175 { 176 printf("%I64d,",i); 177 cnt++; 178 if(cnt%8==0) 179 printf("\n"); 180 } 181 } 182 } 183 } 184 return 0; 185 }*/
注意：
1、普通素数打表方法
2、ltoa函数将长整形转换成字符数组
函数介绍：
void Format( LPCTSTR lpszFormat, ... );和printf的使方法一样
void Format( UINT nFormatID, ... );利用资源格式化字符串,这个比上面的省空间,方便改,功能一样
作用:像printf一样格式化字符串
int sprintf( char *buffer, const char *format [, argument] ... );//用法和 printf 一样
char *itoa( int value, char *string, int radix );
注:
参数:int value :是要转为字符串的int型
char *string :存放字符串的缓冲区
int radix :将int转换为多少进制的数存放在缓冲区中
char *ltoa( long value, char *string, int radix );
注:
参数:long value:是要转为字符串的long型
char *string :存放字符串的缓冲区
int radix :将long转换为多少进制的数存放在缓冲区中
char *ultoa( unsigned long value, char *string, int radix );
注:
参数:unsigned long value:是要转为字符串的unsigned long型
char *string :存放字符串的缓冲区
int radix :将unsigned long转换为多少进制的数存放在缓冲区中
int atoi( const char *string );
注:
参数:const char *string :是要转为int型的字符串
返回值:字符串对应的int型
long atol( const char *string );
注:
参数:const char *string :是要转为long型的字符串
返回值:字符串对应的long型
double atof( const char *string );
注:
参数:const char *string :是要转为double型的字符串
返回值:字符串对应的double型
例:
1.void Format( LPCTSTR lpszFormat, ... );
CString a,b;
a = "12卡拉";
b.Format("%s", a); // b的值为"12卡拉";,因为是把a格式化到b中,相当于a=b
b.Format("%d", a.GetLength()); // b的值为6,因为是把a的字节长格式化到b中
2.void Format( UINT nFormatID, ... );
(1)先打开"ResourceView"视窗
(2)点开"String Table"
(3)双击"String Table [English [U.S.]]"
(4)右键右边的下边空白,点"New String"
(5)在"Caption"右边的框中添:%d(这里也可以改成%s,%c等,根据须要来决定)
(6)把上面的"ID"记住
CString a,b;
a = "12卡拉";
b.Format(添上面的ID号, a.GetLength()); // b的值为6,因为是把a的字节长格式化到b中
例2:
char *p = new char[255];
int a = 10;
double b = 3.14;
long c = 20;
unsigned d = 30;
char *e = "abcde";
CString f;
sprintf(p, "%d", a); //p中的值为10
sprintf(p, "%lf", b); //p中的值为3.140000
sprintf(p, "%ld", c); //p中的值为20
sprintf(p, "%u", d); //p中的值为30
sprintf(p, "%s", e); //p中的值为abcde
f.Format("%d", a); //f中的值为10
f.Format("%lf", b); //f中的值为3.140000
f.Format("%ld", c); //f中的值为20
f.Format("%u", d); //f中的值为30
f.Format("%s", e); //f中的值为abcde
itoa(a, p, 10); //p中的值为10
ltoa(c, p, 10); //p中的值为20
ultoa(d, p, 10); //p中的值为30
char *g = "40";
char *h = "4.59";
int i = atoi(g); //i中的值为40
long j = atol(g); //j中的值为40
double k = atof(h); //k中的值为4.58999999...