Submission #413603

#	Time	Username	Problem	Language	Result	Execution time	Memory
413603		jamezzz	Tents (JOI18_tents)	C++14	100 / 100	325 ms	71236 KiB

tents

#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
#include <ext/rope>
using namespace __gnu_cxx;

typedef tree<long long, null_type, less<long long>,
rb_tree_tag, tree_order_statistics_node_update> pbds;
//less_equal for identical elements

//#define DEBUG

#ifdef DEBUG
#define debug(...) printf(__VA_ARGS__);
#else
#define debug(...)
#endif
#define sf scanf
#define pf printf
#define fi first
#define se second
#define pb emplace_back
#define sz(x) (int)x.size()
#define mnto(x,y) x=min(x,(__typeof__(x))y)
#define mxto(x,y) x=max(x,(__typeof__(x))y)
#define INF 1023456789
#define LINF 1023456789123456789
#define all(x) x.begin(), x.end()
typedef long long ll;
typedef long double ld;
typedef pair<int, int> ii;
typedef pair<ll, ll> pll;
typedef tuple<int, int, int> iii;
typedef tuple<int, int, int, int> iiii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<pll> vll;

#define mod 1000000007
ll m[3005][3005];

ll dp(int h,int w){
	if(h<0||w<0)return 0;
	if(h==0||w==0)return 1;
	if(m[h][w]!=-1)return m[h][w];
	if(h==1)return 4*w+1+w*(w-1)/2;
	return m[h][w]=(dp(h-1,w)+4*w*dp(h-1,w-1)+w*(w-1)/2*dp(h-1,w-2)+w*(h-1)*dp(h-2,w-1))%mod;
}

int main(){
	int h,w;sf("%d%d",&h,&w);
	memset(m,-1,sizeof m);
	pf("%lld\n",(dp(h,w)-1+mod)%mod);
}

Compilation message (stderr)

tents.cpp: In function 'int main()':
tents.cpp:53:12: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   53 |  int h,w;sf("%d%d",&h,&w);
      |            ^

• Subtask 1: 48 / 48
• Subtask 2: 52 / 52