#include<iostream>
using namespace std;
int main(){
    ios::sync_with_stdio(false);
    int n;
    cin >> n;
    if(!(n & 1)){
        cout << (n >> 1);
        return 0;
    }
    for(int i = 3; i*i <= n; i+=2){
        if(n % i == 0)cout << n/i;
    }
    return 0;
}

#include<bits/stdc++.h>
using namespace std;
int main(){
    ios::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    register int i,j;
    int n;
    cin>>n;
    for(i=2;i*i<=n;++i)
        if(n%i==0){
            cout<<n/i;
            exit(0);
        }
    return 0;
}

#include<bits/stdc++.h>
using  namespace  std;
int  main()
{
   long long int x,y,n,t=0;
   //freopen("prime.in","r",stdin);
    //freopen("prime.out","w",stdout);
   cin>>n;
   for(int i=2;i<=sqrt(n);i=i+1)
   {
    if(n%i==0)cout<<n/i;
   }
   return 0;
}

#include <bits/stdc++.h>
using namespace std;
int main() {
    int n; cin>>n;
    for (int i=2; i<=n; i++)
            if(n%i==0){ 
        cout<<n/i;
        break;
    }
    return 0;
}

#include<iostream>
using namespace std;

int n;

int main(){
    cin >> n;
    
    for(int i = 2; i <= n / i; i ++){
        if(n % i == 0){
            cout << n / i;
            break;
        }
    }
    return 0;
}

显然对于\(i \times j=n\)且\(i < j\)，则必有：

\(i < sqrt(n)\)，\(j > sqrt(n)\)

所以，枚举\(i\)从而确定\(j\)，时间复杂度为\(O(\sqrt{n})\)

所以说，本题的数据给\(10^{15}\)也不会\(TLE\)啊！

\(pj\)题目签到太水。（大雾）

#include<bits/stdc++.h>
using namespace std;
int main(){
    int n; cin>>n;
    for(int i=2;i*i<=n;i++)
        if(n%i==0) {
            printf("%d\n",n/i); return 0;
        }
    return 0;
}

#include<cstdio>
using namespace std;
int main(){
int n,p;
scanf("%d",&n);
for(int i=2;i*i<=n;i++){
if(n%i==0){
p=n/i;
printf("%d",p);
break;
}
}
return 0;
}

so water

#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <cstring>
#include <algorithm>
using namespace std;
int main()
{
    long long all,i;
    scanf("%lld",&all);
    for(i=2;i<=all;i++)
    {
        if(all%i==0)
        {
            printf("%lld",all/i);
            return 0;
        }
    }
    return 0;
}

对于这道题的数据我就只是笑笑
#include<iostream>
#include<cmath>
#include<cstdio>
using namespace std;
int main()
{
int n,m;
cin>>n;
for(int j=2;j<=n;++j)
{
if(n%j==0)
{
cout<<n/j;
break;
}
}
}

#include <iostream>
#include <iomanip>
#include <cmath>
#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <algorithm>
#include <cctype>
#include <vector>
#include <queue>
using namespace std;
int main()
{
int n;
scanf("%d",&n);
for(int i=2;i<=n;i++)
{
if(n%i==0)
{
printf("%d",n/i);
break;
}
}
return 0;
}

#include<iostream>
#include<cstdio>
#include<cstdlib>
#include<algorithm>
#include<cmath>
#include<cstring>
#include<string>
#include<vector>
#include<set>
#include<queue>
using namespace std;
int main()
{
int Zoe,Forever,xzy,clxf,YBB;
int n,a;
scanf("%d",&n);
for(int i=2;i<=n;i++)
if(n%i==0)
{
a=n/i;
printf("%d",a);
return 0;
}
}

筛选法
#include<cstdio>
#include<algorithm>
#include<cstdlib>
#include<iostream>
#include<cmath>
#include<ctime>
using namespace std;
bool data[10000000];
int main(){
//freopen("prime.in","r",stdin);
//freopen("prime.out","w",stdout);
long long n;
scanf("%lld",&n);

for(long long i=2;i<=n;i++)
{ if(data[i]==1) continue;
if(n%i==0) {
printf("%lld",n/i); break;
}
for(long long j=i+i;j<=sqrt(n);j+=i)
data[j]=1;
}

return 0;
}

#include<stdio.h>
#include<stdlib.h>

int zs(int x){
int i;
for (i=2; i*i<=x; i++)
if (x%i==0) return 0;
if (x==1) return 0;
return 1;
}

int main () {
int n;
scanf("%d",&n);
for (int i=2; i*i<=n; i++)
if(zs(i) && n%i==0 && zs(n/i)){
printf("%d\n",n/i);return 0;
}
return 0;
}

这个题。。。。。当我看到2*10的9次方。。。还以为是用long 谁知道int就好。。。记一下范围

..........
#include <cstdio>

int main(){
int n;
scanf("%d",&n);
for(int i=2;;i++){
if(n%i==0){
printf("%d",n/i);
return 0;
}
}
}

water all of the floor...

测试数据 #0: Accepted, time = 0 ms, mem = 480 KiB, score = 10
测试数据 #1: Accepted, time = 0 ms, mem = 484 KiB, score = 10
测试数据 #2: Accepted, time = 15 ms, mem = 484 KiB, score = 10
测试数据 #3: Accepted, time = 0 ms, mem = 480 KiB, score = 10
测试数据 #4: Accepted, time = 0 ms, mem = 484 KiB, score = 10
测试数据 #5: Accepted, time = 0 ms, mem = 484 KiB, score = 10
测试数据 #6: Accepted, time = 0 ms, mem = 484 KiB, score = 10
测试数据 #7: Accepted, time = 0 ms, mem = 484 KiB, score = 10
测试数据 #8: Accepted, time = 0 ms, mem = 484 KiB, score = 10
测试数据 #9: Accepted, time = 0 ms, mem = 484 KiB, score = 10
Accepted, time = 15 ms, mem = 484 KiB, score = 100
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
int n,i,end,ans;
void init ()
{
scanf ("%d",&n);
}
void work ()
{
end=(int )sqrt (n);
for (i=2;i<=end;i++) {
if ((n%i)==0) {
ans=n/i;
break;
}
}
}
void output ()
{
printf ("%d",ans);
}
int main ()
{
init ();
work ();
output ();
return 0;
}

#include<iostream>
#include<cmath>
using namespace std;
int main(){
int n;
cin>>n;
for(int i=2;i<=sqrt(n);i++){
if(n%i==0){
cout<<n/i;return 0;
}
}
}

不是很相信结果。

测试数据 #0: Accepted, time = 0 ms, mem = 560 KiB, score = 10
测试数据 #1: Accepted, time = 0 ms, mem = 560 KiB, score = 10
测试数据 #2: Accepted, time = 0 ms, mem = 556 KiB, score = 10
测试数据 #3: Accepted, time = 0 ms, mem = 564 KiB, score = 10
测试数据 #4: Accepted, time = 0 ms, mem = 560 KiB, score = 10
测试数据 #5: Accepted, time = 0 ms, mem = 560 KiB, score = 10
测试数据 #6: Accepted, time = 0 ms, mem = 564 KiB, score = 10
测试数据 #7: Accepted, time = 0 ms, mem = 564 KiB, score = 10
测试数据 #8: Accepted, time = 0 ms, mem = 560 KiB, score = 10
测试数据 #9: Accepted, time = 0 ms, mem = 560 KiB, score = 10
Accepted, time = 0 ms, mem = 564 KiB, score = 100
~~~c++
#include<iostream>
#include<cmath>
using namespace std;
int main(){
int n;
cin>>n;
for(int i=2;i<=sqrt(n);i++){
if(n%i==0){
cout<<n/i;return 0;
}
}
}
~~~

#include<iostream>
using namespace std;
int prime[4648] = {2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97,101,103,107,109,113,127,131,137,139,149,151,157,163,167,173,179,181,191,193,197,199,211,223,227,229,233,239,241,251,257,263,269,271,277,281,283,293,307,311,313,317,331,337,347,349,353,359,367,373,379,383,389,397,401,409,419,421,431,433,439,443,449,457,461,463,467,479,487,491,499,503,509,521,523,541,547,557,563,569,571,577,587,593,599,601,607,613,617,619,631,641,643,647,653,659,661,673,677,683,691,701,709,719,727,733,739,743,751,757,761,769,773,787,797,809,811,821,823,827,829,839,853,857,859,863,877,881,883,887,907,911,919,929,937,941,947,953,967,971,977,983,991,997,1009,1013,1019,1021,1031,1033,1039,1049,1051,1061,1063,1069,1087,1091,1093,1097,1103,1109,1117,1123,1129,1151,1153,1163,1171,1181,1187,1193,1201,1213,1217,1223,1229,1231,1237,1249,1259,1277,1279,1283,1289,1291,1297,1301,1303,1307,1319,1321,1327,1361,1367,1373,1381,1399,1409,1423,1427,1429,1433,1439,1447,1451,1453,1459,1471,1481,1483,1487,1489,1493,1499,1511,1523,1531,1543,1549,1553,1559,1567,1571,1579,1583,1597,1601,1607,1609,1613,1619,1621,1627,1637,1657,1663,1667,1669,1693,1697,1699,1709,1721,1723,1733,1741,1747,1753,1759,1777,1783,1787,1789,1801,1811,1823,1831,1847,1861,1867,1871,1873,1877,1879,1889,1901,1907,1913,1931,1933,1949,1951,1973,1979,1987,1993,1997,1999,2003,2011,2017,2027,2029,2039,2053,2063,2069,2081,2083,2087,2089,2099,2111,2113,2129,2131,2137,2141,2143,2153,2161,2179,2203,2207,2213,2221,2237,2239,2243,2251,2267,2269,2273,2281,2287,2293,2297,2309,2311,2333,2339,2341,2347,2351,2357,2371,2377,2381,2383,2389,2393,2399,2411,2417,2423,2437,2441,2447,2459,2467,2473,2477,2503,2521,2531,2539,2543,2549,2551,2557,2579,2591,2593,2609,2617,2621,2633,2647,2657,2659,2663,2671,2677,2683,2687,2689,2693,2699,2707,2711,2713,2719,2729,2731,2741,2749,2753,2767,2777,2789,2791,2797,2801,2803,2819,2833,2837,2843,2851,2857,2861,2879,2887,2897,2903,2909,2917,2927,2939,2953,2957,2963,2969,2971,2999,3001,3011,3019,3023,3037,3041,3049,3061,3067,3079,3083,3089,3109,3119,3121,3137,3163,3167,3169,3181,3187,3191,3203,3209,3217,3221,3229,3251,3253,3257,3259,3271,3299,3301,3307,3313,3319,3323,3329,3331,3343,3347,3359,3361,3371,3373,3389,3391,3407,3413,3433,3449,3457,3461,3463,3467,3469,3491,3499,3511,3517,3527,3529,3533,3539,3541,3547,3557,3559,3571,3581,3583,3593,3607,3613,3617,3623,3631,3637,3643,3659,3671,3673,3677,3691,3697,3701,3709,3719,3727,3733,3739,3761,3767,3769,3779,3793,3797,3803,3821,3823,3833,3847,3851,3853,3863,3877,3881,3889,3907,3911,3917,3919,3923,3929,3931,3943,3947,3967,3989,4001,4003,4007,4013,4019,4021,4027,4049,4051,4057,4073,4079,4091,4093,4099,4111,4127,4129,4133,4139,4153,4157,4159,4177,4201,4211,4217,4219,4229,4231,4241,4243,4253,4259,4261,4271,4273,4283,4289,4297,4327,4337,4339,4349,4357,4363,4373,4391,4397,4409,4421,4423,4441,4447,4451,4457,4463,4481,4483,4493,4507,4513,4517,4519,4523,4547,4549,4561,4567,4583,4591,4597,4603,4621,4637,4639,4643,4649,4651,4657,4663,4673,4679,4691,4703,4721,4723,4729,4733,4751,4759,4783,4787,4789,4793,4799,4801,4813,4817,4831,4861,4871,4877,4889,4903,4909,4919,4931,4933,4937,4943,4951,4957,4967,4969,4973,4987,4993,4999,5003,5009,5011,5021,5023,5039,5051,5059,5077,5081,5087,5099,5101,5107,5113,5119,5147,5153,5167,5171,5179,5189,5197,5209,5227,5231,5233,5237,5261,5273,5279,5281,5297,5303,5309,5323,5333,5347,5351,5381,5387,5393,5399,5407,5413,5417,5419,5431,5437,5441,5443,5449,5471,5477,5479,5483,5501,5503,5507,5519,5521,5527,5531,5557,5563,5569,5573,5581,5591,5623,5639,5641,5647,5651,5653,5657,5659,5669,5683,5689,5693,5701,5711,5717,5737,5741,5743,5749,5779,5783,5791,5801,5807,5813,5821,5827,5839,5843,5849,5851,5857,5861,5867,5869,5879,5881,5897,5903,5923,5927,5939,5953,5981,5987,6007,6011,6029,6037,6043,6047,6053,6067,6073,6079,6089,6091,6101,6113,6121,6131,6133,6143,6151,6163,6173,6197,6199,6203,6211,6217,6221,6229,6247,6257,6263,6269,6271,6277,6287,6299,6301,6311,6317,6323,6329,6337,6343,6353,6359,6361,6367,6373,6379,6389,6397,6421,6427,6449,6451,6469,6473,6481,6491,6521,6529,6547,6551,6553,6563,6569,6571,6577,6581,6599,6607,6619,6637,6653,6659,6661,6673,6679,6689,6691,6701,6703,6709,6719,6733,6737,6761,6763,6779,6781,6791,6793,6803,6823,6827,6829,6833,6841,6857,6863,6869,6871,6883,6899,6907,6911,6917,6947,6949,6959,6961,6967,6971,6977,6983,6991,6997,7001,7013,7019,7027,7039,7043,7057,7069,7079,7103,7109,7121,7127,7129,7151,7159,7177,7187,7193,7207,7211,7213,7219,7229,7237,7243,7247,7253,7283,7297,7307,7309,7321,7331,7333,7349,7351,7369,7393,7411,7417,7433,7451,7457,7459,7477,7481,7487,7489,7499,7507,7517,7523,7529,7537,7541,7547,7549,7559,7561,7573,7577,7583,7589,7591,7603,7607,7621,7639,7643,7649,7669,7673,7681,7687,7691,7699,7703,7717,7723,7727,7741,7753,7757,7759,7789,7793,7817,7823,7829,7841,7853,7867,7873,7877,7879,7883,7901,7907,7919,7927,7933,7937,7949,7951,7963,7993,8009,8011,8017,8039,8053,8059,8069,8081,8087,8089,8093,8101,8111,8117,8123,8147,8161,8167,8171,8179,8191,8209,8219,8221,8231,8233,8237,8243,8263,8269,8273,8287,8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2139,42157,42169,42179,42181,42187,42193,42197,42209,42221,42223,42227,42239,42257,42281,42283,42293,42299,42307,42323,42331,42337,42349,42359,42373,42379,42391,42397,42403,42407,42409,42433,42437,42443,42451,42457,42461,42463,42467,42473,42487,42491,42499,42509,42533,42557,42569,42571,42577,42589,42611,42641,42643,42649,42667,42677,42683,42689,42697,42701,42703,42709,42719,42727,42737,42743,42751,42767,42773,42787,42793,42797,42821,42829,42839,42841,42853,42859,42863,42899,42901,42923,42929,42937,42943,42953,42961,42967,42979,42989,43003,43013,43019,43037,43049,43051,43063,43067,43093,43103,43117,43133,43151,43159,43177,43189,43201,43207,43223,43237,43261,43271,43283,43291,43313,43319,43321,43331,43391,43397,43399,43403,43411,43427,43441,43451,43457,43481,43487,43499,43517,43541,43543,43573,43577,43579,43591,43597,43607,43609,43613,43627,43633,43649,43651,43661,43669,43691,43711,43717,43721,43753,43759,43777,43781,43783,43787,43789,43793,43801,43853,43867,43889,43891,43913,43933,43943,43951,43961,43963,43969,43973,43987,43991,43997,44017,44021,44027,44029,44041,44053,44059,44071,44087,44089,44101,44111,44119,44123,44129,44131,44159,44171,44179,44189,44201,44203,44207,44221,44249,44257,44263,44267,44269,44273,44279,44281,44293,44351,44357,44371,44381,44383,44389,44417,44449,44453,44483,44491,44497,44501,44507,44519,44531,44533,44537,44543,44549,44563,44579,44587,44617,44621,44623,44633,44641,44647,44651,44657,44683,44687,44699,44701,44711};
int main()
{
    long long x;
    cin >> x;
    for(int i = 0; i < 4648; i++)
        if(x % prime[i] == 0)
        {
            cout << x / prime[i] << endl;
            return 0;
        }
}

#include <iostream>
#include <algorithm>
#include <cmath>
#include <cstring>
#include <cstdio>
#include <cstdlib>
#include <queue>
#define N 11000
using namespace std;

int n,ans[N],dix[N];

int su(int x)
{
for(int i=2;i<=sqrt(x);i++)
if(x%i==0)
return 0;
return 1;
}

int main()
{/*
int cnt=0,sum=-1,tm=0;
scanf("%d",&n);
for(int i=1;i<=n;i++)
if(su(i))
{
cnt++;
ans[cnt]=i;
}
for(int i=1;i<=cnt;i++)
for(int j=i+1;j<=cnt;j++)
if(ans[i]*ans[j]==n)
{
tm++;
dix[tm]=ans[j];
}
for(int i=1;i<=tm;i++)
sum=max(sum,dix[i]);
printf("%d",sum);*/
scanf("%d",&n);
for(int i=2;i<=n/2;i++)
{
if(n%i==0)
{
printf("%d",n/i);
break;
}
}
return 0;
}