hdu 3463Goldbach Division（打表法）

在这里留下一个纪念！！

/* 这个题目应该是我代码写的最搓的了，但是还好AC了。刚学会了打表，AC了就好 */ #include <iostream> #include <algorithm> #include <cstdio> #include <cstring> using namespace std; const int N = 7801; bool prime[N]; int sum[12209] = { 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18,197,129116,336,126512,225,85317,171,124990,418,116831,162,85051,166,128672,551,125849,167,85868,174,118206,320,122197,166,85061,223,128959,319,127202,207,78853,189,129132,340,126654,248,82434,172,129500,336,117255,169,85045,200,129016,445,126422,159,85362,167,115779,328,127279,194,85043,241,129367,389,127276,170,79227,184,129908,360,121442,224,85511,157,129560,327,117325,214,86090,180,128409,489,127503,166,83259,167,119293,329,127560,154,85643,271,128228,365,127872,164,79484,171,125716,328,126973,220,85591,207,130001,418,116700,178,86460,167,130032,430,123078,173,85205,168,120020,367,127884,215,85464,221,130177,337,128312,183,77003,164,130374,344,127228,218,85481,197,130600,331,116530,177,86533,159,125729,447,127380,160,86462,177,120171,446,128547,159,86057,229,130327,340,123971,181,79466,165,128407,330,128003,279,85971,164,130830,326,118483,169,83831,187,130042,526,127641,157,86635,216,120569,333,129172,165,85197,225,126448,342,127653,161,79899,168,130612,389,127733,247,86514,184,131243,321,115113,185,86785,178,130530,458,126897,192,86818,183,121120,339,129315,175,82940,210,130394,371,128879,172,80026,194,131404,339,128688,212,86284,189,125718,339,118778,169,86807,167,131093,558,128284,165,87514,183,120653,338,125385,175,86497,217,131164,329,129497,214,79178,174,131493,357,128490,225,83992,165,131870,330,118701,187,87117,213,131084,453,127876,164,87651,163,117904,335,128141,180,86758,219,131262,434,129635,191,80625,167,132097,365,125112,231 }; int Prime(int ss, int n) { int num = 0; for(int i = ss; i < n / 2; i++) { if(!prime[i] && !prime[n - i]) num++; } return num; } int main() { memset(prime, false, sizeof(prime)); prime[1] = true; for(int i = 2; i < N / 2; i++) for(int j = i + i; j < N; j += i) prime[j] = true; int n; while( scanf("%d", &n) != EOF ) { int count = 0; if(n < 7800) { if(n & 1) { for(int i = 2; i < n / 3; i++) { if(!prime[i]) count += Prime(i + 1, n - i); } printf("%d/n", count); } else { printf("%d/n", Prime(2, n)); } continue; } else printf("%d/n", sum[n - 7800]); } }

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