oj.uz

Submission #99943

# Submission time Handle Problem Language Result Execution time Memory
99943 2019-03-08T21:09:54 Z TadijaSebez Boat (APIO16_boat) C++11
27 / 100
 2000 ms 9088 KB 
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pb push_back
const int N=505;
const int M=2*N;
const int K=1000050;
const int mod=1e9+7;
int mul(int x, int y){ return (ll)x*y%mod;}
int add(int x, int y){ x+=y;return x>=mod?x-mod:x;}
int sub(int x, int y){ x-=y;return x<0?x+mod:x;}
int pow(int x, int k){ int ans=1;for(;k;k>>=1,x=mul(x,x)) if(k&1) ans=mul(ans,x);return ans;}
int inv(int x){ return pow(x,mod-2);}
int F[K],I[K];
int binom(int n, int k){ return n<k?0:mul(F[n],mul(I[k],I[n-k]));}
int dp[N],tmp[N][N],l[N],r[N];
void calc()
{
	F[0]=1;for(int i=1;i<K;i++) F[i]=mul(F[i-1],i);
	I[K-1]=inv(F[K-1]);for(int i=K-2;~i;i--) I[i]=mul(I[i+1],i+1);
}
int bc[N];
int main()
{
	calc();
	int n;
	scanf("%i",&n);
	vector<int> all;
	for(int i=1;i<=n;i++)
	{
		scanf("%i %i",&l[i],&r[i]);
		all.pb(l[i]);
		all.pb(r[i]+1);
	}
	sort(all.begin(),all.end());
	all.resize(unique(all.begin(),all.end())-all.begin());
	dp[0]=1;
	for(int t=1;t<all.size();t++)
	{
		int L=all[t]-all[t-1];
		bc[0]=1;
		for(int i=1;i<=n;i++) bc[i]=mul(bc[i-1],mul(L-i+1,inv(i)));
		for(int i=1;i<=n;i++) dp[i]=add(dp[i],dp[i-1]);
		for(int j=1;j<=n;j++)
		{
			for(int i=1;i<=n;i++)
			{
				if(all[t-1]<=r[i] && all[t-1]>=l[i]) tmp[i][j]=j==1?dp[i-1]:tmp[i-1][j-1];
				else tmp[i][j]=0;
			}
			if(j==1) for(int i=n;i>=1;i--) dp[i]=sub(dp[i],dp[i-1]);
			for(int i=1;i<=n;i++) dp[i]=add(dp[i],mul(tmp[i][j],bc[j]));
			for(int i=1;i<=n;i++) tmp[i][j]=add(tmp[i][j],tmp[i-1][j]);
		}
	}
	int ans=0;
	for(int i=1;i<=n;i++) ans=add(ans,dp[i]);
	printf("%i\n",ans);
	return 0;
}

Compilation message

boat.cpp: In function 'int main()':
boat.cpp:38:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int t=1;t<all.size();t++)
              ~^~~~~~~~~~~
boat.cpp:27:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%i",&n);
  ~~~~~^~~~~~~~~
boat.cpp:31:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%i %i",&l[i],&r[i]);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 9.0

# Verdict Execution time Memory Grader output
1 Execution timed out 2061 ms 9088 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #2
0 / 22.0

# Verdict Execution time Memory Grader output
1 Execution timed out 2061 ms 9088 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #3
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 39 ms 8400 KB Output is correct
2 Correct 38 ms 8440 KB Output is correct
3 Correct 38 ms 8316 KB Output is correct
4 Correct 38 ms 8448 KB Output is correct
5 Correct 38 ms 8320 KB Output is correct
6 Correct 39 ms 8312 KB Output is correct
7 Correct 42 ms 8448 KB Output is correct
8 Correct 41 ms 8396 KB Output is correct
9 Correct 38 ms 8440 KB Output is correct
10 Correct 44 ms 8368 KB Output is correct
11 Correct 41 ms 8440 KB Output is correct
12 Correct 44 ms 8440 KB Output is correct
13 Correct 38 ms 8440 KB Output is correct
14 Correct 38 ms 8448 KB Output is correct
15 Correct 38 ms 8320 KB Output is correct
16 Correct 32 ms 8440 KB Output is correct
17 Correct 33 ms 8440 KB Output is correct
18 Correct 31 ms 8384 KB Output is correct
19 Correct 31 ms 8320 KB Output is correct
20 Correct 30 ms 8364 KB Output is correct

Subtask #4
0 / 42.0

# Verdict Execution time Memory Grader output
1 Execution timed out 2061 ms 9088 KB Time limit exceeded
2 Halted 0 ms 0 KB -