Submission #255666

#	Time	Username	Problem	Language	Result	Execution time	Memory
255666		blacktulip	Zapina (COCI20_zapina)	C++17	110 / 110	413 ms	2936 KiB

zapina

#pragma GCC optimize ("O3")
#pragma GCC target ("sse4")
#pragma GCC optimize ("unroll-loops")
#pragma GCC target ("avx2")

#include <bits/stdc++.h>

using namespace std;

typedef long long lo;
typedef pair< lo,lo > PII;

#define fi first
#define se second
#define mp make_pair
#define endl "\n"
#define pb push_back
#define fio() ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define FOR for(int i=1;i<=n;i++)
#define mid ((start+end)/2)
#define ort ((bas+son)/2)

const lo inf = 1000000000000000000;
const lo KOK = 100000;
const lo LOG = 30;
const lo li = 353;
const lo mod = 1000000007;

int n,m,b[li],a[li],k,t,comb[li][li],dp[li][li][4];
int cev;
string s;
vector<int> v;

inline int add(int x,int y){
	if(x+y>=mod)return x+y-mod;
	return x+y;
}

inline int mul(int x,int y){
	return (x%mod)*(y%mod)%mod;
}

inline int f(int sira,int how,int flag){
	int cevv=0;
	if(how<0)return 0;
	if(how==0)return flag;
	if(sira>n){
		return 0;
	}
	if(~dp[sira][how][flag])return dp[sira][how][flag];
	for(int i=0;i<=how;i++){
		cevv=add(cevv,mul(comb[how][i],f(sira+1,how-i,flag|(sira==i?1:0))));
	}
	return dp[sira][how][flag]=cevv;
}

int main(void){
	memset(dp,-1,sizeof(dp));
	scanf("%d",&n);
	comb[0][0]=1;
	FOR{
		for(int j=0;j<=n;j++){
			comb[i][j]=comb[i-1][j];
			if(j)comb[i][j]=add(comb[i][j],comb[i-1][j-1]);
		}
	}
	printf("%d\n",f(1,n,0));
	return 0;
}

Compilation message (stderr)

zapina.cpp: In function 'int main()':
zapina.cpp:59:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ~~~~~^~~~~~~~~

• Subtask 1: 22 / 22
• Subtask 2: 33 / 33
• Subtask 3: 55 / 55