（挑战编程_7_1）Light, more light

http://www.programming-challenges.com/pg.php?page=downloadproblem&probid=110701&format=html

#include <iostream>#include <cstdlib>#include <vector>#include <set>#include <string>#include <cstring>#include <fstream>#include <cassert>#include <cmath>using namespace std;//#define _MY_DEBUG_/*MainStructure: 主结构*/void MainStructure();/*Process*/void Process();/*判断最后一盏灯是开还是关：开：true关：false*/bool IsOpen(unsigned num);int main(){MainStructure();return 0;}void MainStructure(){#ifdef _MY_DEBUG_string inputStr = "C:/Users/cao/Desktop/算法/要看的书/算法/2挑战编程/input/1.inp";//string inputStr = "D:/2挑战编程/input/110205.inp";string outputStr = "C:/Users/cao/Desktop/算法/要看的书/算法/2挑战编程/input/1.outp";ifstream fin;fin.open(inputStr);cin.rdbuf(fin.rdbuf());/*ofstream fout;fout.open(outputStr.c_str());cout.rdbuf(fout.rdbuf());*/#endifProcess();}void Process(){unsigned num = 0;while (cin >> num){if (num == 0){break;}if (IsOpen(num)){cout << "yes" << endl;}else{cout << "no" << endl;}}}bool IsOpen(unsigned num){unsigned sNum = (int)sqrt(double (num));if (sNum *sNum == num){return true;}return false;}