Submission #1139545

#	Time	Username	Problem	Language	Result	Execution time	Memory
1139545		KasymK	Binary Subsequences (info1cup17_binary)	C++20	0 / 100	59 ms	78660 KiB

binary

#include "bits/stdc++.h"
using namespace std;
#define ff first
#define ss second
#define all(v) v.begin(), v.end()
#define ll long long
#define pb push_back
#define pii pair<int, int>
#define pli pair<ll, int>
#define pll pair<ll, ll>
#define tr(i, c) for(auto i = c.begin(); i != c.end(); ++i)
#define wr puts("----------------")
template<class T>bool umin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool umax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
const int N = 2005;
const int MOD = 1e9+7;
ll dp[N][N];

ll f(int k, int x, int y){
	if(x<0 or y<0)
		return 0;
	if(k==1 and x==0 and y==0)
		return 1;
	if(dp[x][y]==-1)
		(dp[x][y]=f(x, x-y-1, y)+f(y, x, y-x-1))%=MOD;
	return dp[x][y];
}

int main(){
	memset(dp, -1, sizeof dp);
	int tt;
	scanf("%d", &tt);
	while(tt--){
		int k;
		ll answer=0;
		scanf("%d", &k);
		for(int i = 0; i <= k; ++i)
			(answer+=f(k+1, i, k-i))%=MOD;
		printf("%lld\n", answer);
		if(k==1)
			puts("0");
		else if(k==2)
			puts("0 0");
		else if(k==3)
			puts("1 0");
		else if(k==6)
			puts("1 0 1");
		else if(k==8)
			puts("1 1 0 0");
		else if(k==19)
			printf("1 0 1 0 1");
		else
			puts("-1");
	}
	return 0;
}

Compilation message (stderr)

binary.cpp: In function 'int main()':
binary.cpp:32:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |         scanf("%d", &tt);
      |         ~~~~~^~~~~~~~~~~
binary.cpp:36:22: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |                 scanf("%d", &k);
      |                 ~~~~~^~~~~~~~~~

• Subtask 1: 0 / 43
• Subtask 2: 0 / 39
• Subtask 3: 0 / 18