POJ 1006 Biorhythnms（中国剩余定理）

http://poj.org/problem?id=1006

题意：

(n+d) % 23 = p ;
(n+d) % 28 = e ;
(n+d) % 33 = i ;

求最小的n。

思路：

这道题就是中国剩余定理。

#include<iostream>
#include<algorithm>
#include<string>
#include<cstring>
#include<cmath>
using namespace std;

int n;

int main()
{
    //freopen("D:\txt.txt", "r", stdin);
    int p, e, i, d;
    int kase = 0;
    while (cin >> p >> e >> i >> d)
    {
        if (p == -1 && e == -1 && i == -1 && d == -1)  break;
        int lcm = 21252; 
        int n = (5544 * p + 14421 * e + 1288 * i - d + 21252) % 21252;
        if (n == 0)
            n = 21252;
        cout << "Case " << ++kase << ": the next triple peak occurs in " << n << " days." << endl;
    }
    return 0;
}