计算出n-1

对n-1进行质因数分解

// Problem: Prime Land
// Contest: NowCoder
// URL: https://ac.nowcoder.com/acm/contest/21094/D
// Memory Limit: 524288 MB
// Time Limit: 2000 ms
// 
// Powered by CP Editor (https://cpeditor.org)

#include<iostream>
#include<cmath>
#include<algorithm>
#include<vector>
using namespace std;
typedef long long ll;
bool cmp(const pair<int,int> a,const pair<int,int> b){
	return a.first>b.first;
}
void solve(){
	int k;
	cin>>k;
	ll n=1;
	for(int i=1;i<=k;i++){
		int p,e;
		cin>>p>>e;
		n*=pow(p,e);
	}
	n--;
	vector<pair<int,int>> ans;
	for(int i=2;i<=n/i;i++){
		if(n%i==0){
			ll cnt=0;
			while(n%i==0){
				n/=i;
				cnt++;
			}
			ans.push_back({i,cnt});
		}
	}
	if(n>1){
		ans.push_back({n,1});
	}
	sort(ans.begin(),ans.end(),cmp);
	for(auto &[x,y] : ans){
		cout<<x<<" "<<y<<" ";
	}
	cout<<'\n';
}
int main(){
	ios::sync_with_stdio(false);
	cin.tie(0),cout.tie(0);
	int t;
	cin>>t;
	while(t--){
		solve();
	}
	return 0;
}