oj.uz

Submission #545686

# Submission time Handle Problem Language Result Execution time Memory
545686 2022-04-05T07:48:12 Z MilosMilutinovic Skyscraper (JOI16_skyscraper) C++14
100 / 100
 306 ms 2768 KB 
#include<bits/stdc++.h>

#define fi first
#define se second
#define pb push_back
#define mp make_pair

using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

template<typename T> bool chkmax(T&x,T y){return x<y?x=y,1:0;}
template<typename T> bool chkmin(T&x,T y){return x>y?x=y,1:0;}

const int md=1e9+7;
int n,l,a[105],dp[105][1005][3],tmp[105][1005][3];

void chkadd(int&x,int y){x+=y; if(x>=md) x-=md;}
int mul(int x,int y){return (ll)x*y%md;}

int main(){
	scanf("%d%d",&n,&l);
	for(int i=1;i<=n;i++) scanf("%d",&a[i]);
	if(n==1){printf("1"); return 0;}
	sort(a+1,a+n+1);
	if((a[2]-a[1])*2<=l) dp[1][(a[2]-a[1])*2][0]=1;
	if(a[2]-a[1]<=l) dp[1][a[2]-a[1]][1]=2;
	for(int i=2;i<=n;i++){
		int d=a[i+1]-a[i];
		for(int j=1;j<=n;j++)
			for(int s=0;s<=l;s++)
				for(int k=0;k<=2;k++)
					tmp[j][s][k]=dp[j][s][k],dp[j][s][k]=0;
		for(int j=1;j<=n;j++){
			for(int s=0;s<=l;s++){
				for(int k=0;k<=2;k++){
					int v=tmp[j][s][k];
					//dodajem bez spajanja, nema novih krajeva
					int ns=s+d*(2*j-k);
					if(ns>=0&&ns<=l) chkadd(dp[j][ns][k],mul(v,2*j-k));
					//spajam, nema novih krajeva
					ns=s+d*(2*j-k-2);
					if(ns>=0&&j>1&&ns<=l) chkadd(dp[j-1][ns][k],mul(v,j-1));
					//pravim novu komponentu, nema novih krajeva
					ns=s+d*(2*j-k+2);
					if(ns>=0&&j<n&&ns<=l) chkadd(dp[j+1][ns][k],mul(v,j+1-k));
					//dodajem bez spajanja, ima novi kraj
					ns=s+d*(2*j-k-1);
					if(ns>=0&&k<2&&ns<=l) chkadd(dp[j][ns][k+1],mul(v,2-k));
					//pravim novu komponentu, ima novi kraj
					ns=s+d*(2*j-k+1);
					if(ns>=0&&k<2&&ns<=l) chkadd(dp[j+1][ns][k+1],mul(v,2-k));
				}
			}
		}
	}
	int ans=0;
	for(int i=0;i<=l;i++) chkadd(ans,dp[1][i][2]);
	printf("%d",ans);
	return 0;
}

Compilation message

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:25:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |  scanf("%d%d",&n,&l);
      |  ~~~~~^~~~~~~~~~~~~~
skyscraper.cpp:26:29: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |  for(int i=1;i<=n;i++) scanf("%d",&a[i]);
      |                        ~~~~~^~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 3 ms 468 KB Output is correct
6 Correct 2 ms 436 KB Output is correct
7 Correct 1 ms 312 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 2 ms 468 KB Output is correct
10 Correct 1 ms 340 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 416 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 1 ms 440 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 468 KB Output is correct
10 Correct 1 ms 440 KB Output is correct

Subtask #3
80.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 3 ms 468 KB Output is correct
6 Correct 2 ms 436 KB Output is correct
7 Correct 1 ms 312 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 2 ms 468 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 416 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 468 KB Output is correct
15 Correct 1 ms 468 KB Output is correct
16 Correct 1 ms 440 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 1 ms 468 KB Output is correct
20 Correct 1 ms 440 KB Output is correct
21 Correct 3 ms 568 KB Output is correct
22 Correct 216 ms 2156 KB Output is correct
23 Correct 306 ms 2676 KB Output is correct
24 Correct 252 ms 2660 KB Output is correct
25 Correct 285 ms 2668 KB Output is correct
26 Correct 259 ms 2768 KB Output is correct
27 Correct 88 ms 1660 KB Output is correct
28 Correct 110 ms 1796 KB Output is correct
29 Correct 226 ms 2356 KB Output is correct
30 Correct 289 ms 2764 KB Output is correct