题目链接:http://cstest.scu.edu.cn/soj/problem.action?id=4312
分段过:
#include<stdio.h> #include<math.h> #include<string.h> int ans[10011]={0,1229,2262,3245,4203,5133,6057,6936,7837,8714,9592,10453,11301,12159,13010,13849,14684,15497,16343,17170,17984,18807,19618,20437,21221,22044,22837,23643,24433,25224,25997,26800,27608,28404,29182,29977,30757,31522,32300,33068,33860,34614,35391,36162,36941,37707,38458,39223,40005,40767,41538,42291,43061,43825,44572,45322,46072,46820,47589,48351,49098,49861,50612,51341,52074,52831,53565,54310,55063,55815,56544,57306,58029,58789,59531,60238,60978,61733,62468,63206,63951,64683,65416,66161,66890,67617,68342,69095,69824,70555,71275,72026,72734,73474,74188,74907,75618,76350,77067,77778,78498,79251,79971,80702,81403,82134,82832,83548,84270,84976,85714,86450,87167,87884,88602,89302,90030,90764,91490,92225,92938,93614,94358,95051,95745,96469,97182,97901,98610,99332,100021,100730,101433,102147,102852,103545,104258,104967,105690,106385,107126,107805,108487,109205,109928,110630,111331,112047,112753,113458,114155,114886,115588,116279,116965,117663,118376,119057,119758,120451,121127,121846,122541,123250,123942,124635,125335,126051,126753,127428,128141,128837,129522,130213,130902,131608,132292,132972,133672,134359,135072,135777,136448,137166,137841,138542,139249,139952,140641,141338,142029,142718,143415,144125,144810,145502,146186,146859,147529,148219,148933,149638,150329,151021,151711,152382,153078,153772,154445,155131,155806,156505,157187,157885,158558,159250,159963,160629,161319,161998,162662,163363,164023,164719,165398,166081,166769,167470,168164,168826,169511,170201,170864,171535,172207,172874,173563,174254,174916,175621,176303,176962,177654,178326,178983,179684,180371,181040,181711,182398,183072,183748,184423,185121,185792,186463,187134,187812,188511,189204,189880,190533,191214,191886,192567,193256,193951,194613,195278,195959,196645,197324,198019,198665,199321,199993,200664,201349,202015,202679,203363,204052,204748,205414,206118,206789,207443,208116,208769,209448,210109,210790,211453,212124,212804,213454,214105,214799,215459,216129,216816,217487,218145,218808,219465,220136,220793,221457,222152,222838,223492,224168,224845,225511,226177,226836,227512,228180,228843,229535,230209,230896,231569,232241,232928,233577,234239,234916,235582,236252,236901,237573,238233,238910,239555,240230,240853,241542,242208,242877,243539,244216,244882,245554,246239,246909,247555,248209,248846,249482,250150,250801,251464,252094,252757,253412,254080,254751,255391,256057,256727,257418,258088,258774,259426,260064,260714,261377,262078,262716,263398,264052,264723,265410,266068,266718,267384,268016,268671,269331,269987,270643,271325,271999,272645,273322,273972,274619,275269,275930,276611,277263,277920,278596,279243,279921,280564,281202,281870,282505,283146,283806,284464,285132,285809,286490,287133,287786,288457,289110,289774,290437,291065,291717,292350,293010,293672,294343,294994,295667,296314,296984,297628,298291,298919,299583,300244,300887,301543,302175,302824,303486,304152,304793,305449,306084,306725,307377,308039,308700,309335,309976,310656,311338,311995,312666,313321,313981,314628,315310,315948,316601,317239,317885,318516,319164,319824,320497,321146,321786,322441,323103,323760,324404,325055,325706,326323,326987,327654,328321,328964,329616,330269,330912,331575,332220,332861,333516,334144,334801,335439,336096,336751,337382,338060,338694,339339,340009,340644,341314,341993,342643,343277,343931,344585,345235,345876,346558,347219,347872,348513,349152,349791,350449,351087,351715,352383,353022,353670,354325,354971,355603,356244,356900,357559,358198,358842,359488,360118,360760,361407,362066,362716,363365,364012,364685,365316,365964,366617,367246,367900,368554,369191,369834,370483,371131,371773,372415,373068,373722,374363,374992,375632,376289,376939,377574,378233,378874,379497,380148,380800,381438,382062,382695,383361,383979,384614,385268,385904,386545,387202,387835,388474,389111,389754,390378,391019,391654,392293,392927,393606,394241,394908,395540,396173,396826,397462,398080,398716,399353,399993,400647,401279,401907,402547,403204,403831,404466,405107,405784,406429,407077,407744,408393,409039,409672,410311,410945,411580,412224,412849,413510,414148,414812,415413,416040,416706,417321,417974,418603,419247,419898,420539,421175,421812,422449,423094,423752,424380,424998,425648,426292,426895,427547,428180,428816,429466,430114,430749,431413,432073,432719,433353,434002,434635,435265,435902,436528,437137,437766,438410,439040,439683,440318,440929,441562,442221,442853,443481,444118,444757,445399,446039,446685,447314,447956,448595,449230,449868,450527,451160,451800,452462,453077,453697,454337,454950,455598,456228,456847,457497,458152,458786,459432,460066,460708,461369,461987,462619,463239,463872,464504,465158,465791,466422,467055,467718,468378,469001,469652,470284,470920,471561,472176,472828,473470,474102,474749,475381,476012,476648,477277,477907,478560,479208,479864,480492,481086,481747,482387,483015,483679,484286,484897,485514,486167,486807,487436,488051,488681,489319,489952,490581,491216,491842,492494,493109,493756,494398,495035,495667,496294,496924,4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bool Isprime(int x){ if(x <= 1)return false; int len = sqrt((double)x); for(int i = 2;i <=len; i++) if(x%i == 0)return false; return true; } int go(int x){ for(int i = 0;i<10001;i++) if(i*10000 + 1 > x)return i-1; } int main(){ int n; while(~scanf("%d",&n)){ int hehe = ans[go(n)]; for(int i = go(n)*10000+2;i<=n;i++) hehe+=Isprime(i); printf("%d\n",hehe); } return 0; }