mirror of
https://github.com/Kiritow/OJ-Problems-Source.git
synced 2024-03-22 13:11:29 +08:00
25 lines
514 B
C++
25 lines
514 B
C++
|
#include <cstdio>
|
||
|
|
typedef long long llg;
|
||
|
|
llg a,b,n,m;
|
||
|
|
void solve(){
|
||
|
|
llg ans1(1),ans2(0),t1(a),t2(1);
|
||
|
|
llg tmp;
|
||
|
|
while(n){
|
||
|
|
if(n&1){
|
||
|
|
tmp = ans1;
|
||
|
|
ans1 = (ans1*t1+ans2*t2*b)%m;
|
||
|
|
ans2 = (tmp*t2+ans2*t1)%m;
|
||
|
|
}
|
||
|
|
tmp = t1;
|
||
|
|
t1 = (t1*t1+t2*t2*b)%m;
|
||
|
|
t2 = 2*tmp*t2%m;
|
||
|
|
n >>= 1;
|
||
|
|
}
|
||
|
|
printf("%lld\n",ans1*2%m);
|
||
|
|
}
|
||
|
|
int main(){
|
||
|
|
while(~scanf("%lld%lld%lld%lld",&a,&b,&n,&m))
|
||
|
|
solve();
|
||
|
|
return 0;
|
||
|
|
}
|