每日1+1；

第一题：https://codeforces.com/contest/1768/problem/A

#include<iostream>
#include <string.h>
#include<string>
#include <vector>
#include <cmath>
#include <algorithm>
using namespace std;

int main(){
int u;
cin>>u;
    while (u--){
     long long num;
     cin>>num;
     bool yes=1;
     for(long long i=num-1;i>0;i++){
     if(num%(i+1)==0){
             cout<<i<<endl;
             yes=0;
             break;
         }
     }
     if(yes){
         cout<<"-1"<<endl;
     }
    }
    return 0;
}

第二题：https://codeforces.com/contest/1768/problem/B

#include<iostream>
#include <string.h>
#include<string>
#include <vector>
#include <cmath>
#include <algorithm>
using namespace std;

int main(){
int u;
cin>>u;
    while (u--){
    int le,num;
    cin>>le>>num;
    int arr[le];
    int sum=0;
    int t=0;
    for(int i=0;i<le;i++){
        cin>>arr[i];
        if(arr[i]==t+1){
            t++;
        }
    }
    int ui=le-t;
int y=(ui)/num;
if(ui%num&&(le-t)){
    y++;
}
//int ui=t/num;
cout<<y<<endl;
    }
    return 0;
}

//济几吓济几