题目传送门：http://poj.org/problem?id=1006
中文版题目：http://hzwer.com/3299.html
完全看不懂题，不过既然大家都说是模线性方程组，那就按照那样做咯！
中国剩余定理的话，看看wiki就明白啦：https://en.wikipedia.org/wiki/Chinese_remainder_theorem
#include<iostream>
#include<cstdio>
using namespace std;
const int SGZ = 3;
const int MAXN = 5;
const int SUM = 23*28*33;
int T,arr[]={0,28*33,23*33,23*28},ori[]={0,23,28,33},a[MAXN],d;
void EX_GCD(int a, int b, int &x, int &y){
if (!b) x=1, y=0;
else EX_GCD(b,a%b,y,x), y -= a/b*x;
}
inline int rev(int w, int MOD){
int ret,tmp; EX_GCD(w,MOD,ret,tmp);
return ret;
}
int main(){
while (cin>>a[1]>>a[2]>>a[3]>>d && a[1] != -1) {
int vout = 0;
for (int i=1;i<=SGZ;i++) vout += a[i]*rev(arr[i],ori[i])*arr[i];
vout = ((vout-d)%SUM+SUM)%SUM; vout = vout?vout:SUM;
printf("Case %d: the next triple peak occurs in %d days.\n",++T,vout);
}
return 0;
}
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