好像可以读的懂

C++ 代码

#include<iostream>
#include <vector>
#include <algorithm>
using namespace std;

const int maxn = 1005;

int n,a,b;
typedef pair<int, int> pii;
vector<pii> peo;
vector<int> res;
vector<int> maxres;

vector<int> mul(vector<int>  v,int a){
    vector<int> ret;
    int x=0 , k =0 ;
    for( int i=0 ; i<res.size() ; i++){
        x = res[i] * a+k;
        ret.push_back(x%10);
        k = x/10;
    }
    while(k){
        ret.push_back(k%10);
        k/=10;
    }
    return ret;
}

vector<int> exp(vector<int> v , int a){
    vector<int> ret;
    int x=0 , k=0;
    for( int i = v.size()-1 ; i>=0 ; i--){
        x=10*k+v[i];
        if(x/a||ret.size()) ret.push_back(x/a);
        k= x%a;
    }
    return ret;
}

vector<int> cmp(vector<int> a , vector<int> b){
    if(a.size() > b.size()) return a;
    if(a.size() < b.size()) return b;
    for( int i=0 ;i<a.size() ; i++){
        if(a[i]>b[i]) return a;
        if( a[i] < b[i]) return b;
    }
    return a;
}

int main(){
    cin>>n>>a>>b;

    res.push_back(1);
    res=mul(res,a);

    while(n--){
        cin>>a>>b;
        pii p(b*a,a);
        peo.push_back(p);
    }

    sort(peo.begin(),peo.end());

    for( auto x : peo){
        res=mul(res, x.second);
        vector<int> temp = exp(res,x.first);
        maxres=cmp(maxres, temp);
    }

    for(auto x:maxres) cout<<x;
    cout<<endl;


    return 0 ;   

}