将一个整数分解为一个或者多个素数的乘积
2016-03-29 16:33
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#include <iostream> #include <vector> #include <cmath> using namespace std; vector<int> vec; vector<int> globalFinal; void drawPic() { //画图,电子钟形式显示 int nums[10][5][3]= { {{1,1,1},{1,0,1},{1,0,1},{1,0,1},{1,1,1}}, {{0,0,1},{0,0,1},{0,0,1},{0,0,1},{0,0,1}}, {{1,1,1},{0,0,1},{1,1,1},{1,0,0},{1,1,1}}, {{1,1,1},{0,0,1},{1,1,1},{0,0,1},{1,1,1}}, {{1,0,1},{1,0,1},{1,1,1},{0,0,1},{0,0,1}}, {{1,1,1},{1,0,0},{1,1,1},{0,0,1},{1,1,1}}, {{1,1,1},{1,0,0},{1,1,1},{1,0,1},{1,1,1}}, {{1,1,1},{0,0,1},{0,0,1},{0,0,1},{0,0,1}}, {{1,1,1},{1,0,1},{1,1,1},{1,0,1},{1,1,1}}, {{1,1,1},{1,0,1},{1,1,1},{0,0,1},{1,1,1}} }; int index,p_count;; for(index=0; index<5; ++index) { int print_num; vector<int>::iterator it = globalFinal.begin(); for (; it!=globalFinal.end(); ++it) { print_num = *it; char num_char[64]; itoa(print_num,num_char,10); int p_index = 0; for(;p_index<strlen(num_char);++p_index){ for(p_count=0; p_count<3; ++p_count) { int print_subNum = num_char[p_index]-'0'; if(nums[print_subNum][index][p_count]) cout << "■"; else cout << " "; } cout<<" "; } if(it != globalFinal.end()-1){ if(2 == index) cout << " * ";else cout<<" "; } } cout << endl; } } void MakePrimer(int N) { vec.clear(); for(int i = 2; i <= N; ++i) { bool flag = true; for(int j = 2; j <= sqrt(i); ++j) { if(i % j == 0) { flag = false; break; } } if (flag == true) { vec.push_back(i); } } } bool CanDividedByPrimer(int N) { //查找乘机为N的素数乘机 int lastFound; int t1=N, t2=1; bool flag = true; for (int i=0; i<vec.size(); ++i) { t1 = N / vec[i]; t2 = N % vec[i]; if (t1 == 0 a01b ) { flag = false; break; } if (t2 == 0 && t1 != 1) { globalFinal.push_back(vec[i]); bool retFlag = CanDividedByPrimer(t1); if (retFlag == false) { flag = false; } break; } else if(t2==0 && t1==1) { globalFinal.push_back(vec[i]); break; } } return flag; } int main() { int N; bool res; while(cin >> N) { MakePrimer(N); res = CanDividedByPrimer(N); if (res) drawPic(); vec.clear(); globalFinal.clear(); } return 0; }
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