結果
| 問題 |
No.458 異なる素数の和
|
| ユーザー |
|
| 提出日時 | 2024-07-09 04:39:39 |
| 言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 40 ms / 2,000 ms |
| コード長 | 3,449 bytes |
| コンパイル時間 | 4,157 ms |
| コンパイル使用メモリ | 195,104 KB |
| 実行使用メモリ | 5,376 KB |
| 最終ジャッジ日時 | 2024-07-09 04:39:46 |
| 合計ジャッジ時間 | 6,120 ms |
|
ジャッジサーバーID (参考情報) |
judge3 / judge1 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 28 |
ソースコード
#include<bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
struct custom_hash {
static uint64_t splitmix64(uint64_t x) {
x += 0x9e3779b97f4a7c15;
x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
return x ^ (x >> 31);
}
size_t operator()(uint64_t x) const {
static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
return splitmix64(x + FIXED_RANDOM);
}
};
typedef tree<int, null_type, greater<int>, rb_tree_tag, tree_order_statistics_node_update> pbds; // find_by_order, order_of_key
//find by order-> element at ith idx(starting from 0)//gives iterator to that index//if not present *it gives 0
//order of key-> number of element less than a number
#define int long long int
// #define ll long long int
#define loop(s, e) for(int i = s; i < e; i++)
#define rloop(e, s) for(int i = e; i>= s; i--)
#define v vector<int>
// #define vll vector<long long int>
#define printyes cout<<"YES\n"
#define printno cout<<"NO\n"
//COMMENT THIS FOR INTERACTIVE PROBLEMS...............
#define endl '\n'
#define mod 1000000007
#define pinf 1e18
#define ninf -1e18
#define printvec(arr) cout<<#arr<<"=> [ ";for(int i = 0; i < arr.size(); i++){cout<<arr[i]<<" ";}cout<<"]"<<endl;
#define dbg(x) cout<<"value of "<<#x<<" is => "<<x<<endl;
#define all(x) x.begin(), x.end()
#define vpii vector<pair<int, int>>
#define pii pair<int,int>
#define pll pair<ll, ll>
#define ff first
#define ss second
#define pb push_back
#define vpll vector<pll>
#define here(i) cout<<"here "<<i<<" "<<endl;
#define rt return;
#define mx max_element
#define mn min_element
#define asum accumulate
int delrow[4] = {-1,0,1,0};
int delcol[4] = {0,1,0,-1};
void printv(v& ans) {
for(auto it: ans)cout<<it<<" ";
cout<<endl;
}
int setBit(int n, int bitNo) {
n = (n|(1LL<<bitNo));
return n;
}
int currBit(int n, int bitNo) {
return ((n&(1ll<<bitNo)) == 0)?0:1;
}
int unSetBit(int n, int bitNo) {
n = (n&(~(1ll<<bitNo)));
return n;
}
//*************************************************CHECK THE CONSTRAINTS**********************************************************//
int f(int a, int b) {
if(b == 0)return 1;
int res = f(a, b/2);
if(b%2 != 0) {
return (((res)%mod * (res)%mod)%mod * a)%mod;
}
else {
return ((res)%mod * (res)%mod)%mod;
}
}
vector<bool> sieve(int n) {
vector<bool> prime(n+1, 1);
prime[0] = 0;
prime[1] = 0;
for(int i = 2; i*i <= n; i++) {
if(prime[i] == 1) {
for(int j = i*i; j <= n; j+=i) {
prime[j] = 0;
}
}
}
return prime;
}
void pikachu(int tt, int tc) {
int n;
cin>>n;
vector<bool> p = sieve(n);
vector<int> dp(n+1, -1e18);
dp[0] = 0;
v prime;
for(int i = 0; i <= n; i++) {
if(p[i] == 1)prime.pb(i);
}
for(auto num: prime) {
for(int i = n; i >= 0; i--) {
if(num + i <= n && dp[i] != -1) {
dp[i+num] = max(dp[i]+1, dp[i+num]);
}
}
}
cout<<((dp[n] == -1e18)?-1:dp[n])<<endl;
}
int32_t main() {
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#ifndef ONLINE_JUDGE
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
#endif
int gsBall = 1;
// cin>>gsBall;
int tt = gsBall;
int tc = 1;
while(gsBall--) {
pikachu(tt, tc);
tc++;
}
return 0;
}