oj.uz

Submission #930249

# Submission time Handle Problem Language Result Execution time Memory
930249 2024-02-19T07:49:49 Z 8pete8 Boat (APIO16_boat) C++17
9 / 100
 172 ms 12636 KB 
#include<iostream>
#include<stack>
#include<map>
#include<vector>
#include<string>
#include<unordered_map>
#include <queue>
#include<cstring>
#include<limits.h>
#include<numeric> //gcd(a,b)
#include<cmath>
#include<set>
#include<algorithm>
#include<bitset> 
#include<stack>
//#include "aliens.h"
using namespace std;
#define ll long long
#define f first
#define endl "\n"
#define s second
#define pii pair<int,int>
#define pppiiii pair<pii,pii>
#define ppii pair<int,pii>
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
#define pb push_back
//#define mp make_pair
#define lb lower_bound
#define ub upper_bound
#define fastio ios::sync_with_stdio(false);cin.tie(NULL);
#define int int64_t
const int mxn=1000+10,minf=-1e18,mod=1e9+7,inf=1e18,lg=30;
int dp[mxn+10][mxn+10],ncr[mxn+10][mxn+10];
//knapsack
int32_t main(){
	fastio
	int n;cin>>n;
	vector<pii>v(n+1);
	vector<int>com;
	int m=inf;
	for(int i=1;i<=n;i++)cin>>v[i].f>>v[i].s;
	for(int i=1;i<=n;i++)com.pb(v[i].f),com.pb(v[i].s);
	ncr[0][0]=1;
	for(int i=1;i<=2*n;i++)for(int j=0;j<=2*n;j++){
		if(j)ncr[i][j]=(ncr[i-1][j]+ncr[i-1][j-1])%mod;
		else ncr[i][j]=ncr[i-1][j];
	}
	for(int i=1;i<=2*n;i++)for(int j=2;j<=2*n;j++)ncr[i][j]=(ncr[i][j]+ncr[i][j-1])%mod;//choose n,all r
	com.pb(minf);
	sort(all(com));
	com.erase(unique(all(com)),com.end());
	for(auto &i:v){
		i.f=lb(all(com),i.f)-com.begin();
		i.s=lb(all(com),i.s)-com.begin();
	}
	for(int i=0;i<=2*n;i++)dp[0][i]=1;
	for(int i=1;i<=n;i++){
		//dp pref i,j ->ith range choose in jth segment
		int sum=0;
		for(int j=v[i].f;j<=v[i].s;j++){
			int len,cnt=0;
			if(j==v[i].f){
				for(int back=i;back>=1;back--)dp[i][j]=(dp[i][j]+(dp[back-1][j-1]*1ll)%mod)%mod;
				continue;
			}
			len=com[j]-com[j-1],cnt=0;
			for(int back=i;back>=1;back--){
				if(v[back].f<=j&&j<=v[back].s)cnt++;//->can choose
				//cout<<len<<" "<<cnt<<" "<<back<<" "<<dp[back-1][j-1]<<" "<<ncr[len][cnt]<<"B\n";
				dp[i][j]=(dp[i][j]+(dp[back-1][j-1]*(ncr[len][cnt]))%mod)%mod;
			}
		}
		for(int j=1;j<com.size();j++)dp[i][j]=(dp[i][j-1]+dp[i][j])%mod;
	//	for(int j=0;j<com.size();j++)cout<<dp[i][j]<<" ";
	//	cout<<'\n';
	}
	int ans=0;
	for(int i=1;i<=n;i++)ans=(ans+dp[i][com.size()-1])%mod;
	cout<<ans;
}
/*
3
1 3
2 5
1 6
->63
2
1 4
2 5
//1 2 3 4 5
1 1 1 1
//1 2 3 4 5
1 3 4 5 5
->18


dp i = i-1,i
*/

Compilation message

boat.cpp: In function 'int32_t main()':
boat.cpp:74:16: warning: comparison of integer expressions of different signedness: 'int64_t' {aka 'long int'} and 'std::vector<long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   74 |   for(int j=1;j<com.size();j++)dp[i][j]=(dp[i][j-1]+dp[i][j])%mod;
      |               ~^~~~~~~~~~~
boat.cpp:60:7: warning: unused variable 'sum' [-Wunused-variable]
   60 |   int sum=0;
      |       ^~~
boat.cpp:41:6: warning: unused variable 'm' [-Wunused-variable]
   41 |  int m=inf;
      |      ^

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 12376 KB Output is correct
2 Correct 12 ms 12376 KB Output is correct
3 Correct 11 ms 12380 KB Output is correct
4 Correct 11 ms 12504 KB Output is correct
5 Correct 11 ms 12380 KB Output is correct
6 Correct 11 ms 12380 KB Output is correct
7 Correct 12 ms 12636 KB Output is correct
8 Correct 11 ms 12376 KB Output is correct
9 Correct 11 ms 12460 KB Output is correct
10 Correct 11 ms 12368 KB Output is correct
11 Correct 11 ms 12376 KB Output is correct
12 Correct 11 ms 12412 KB Output is correct
13 Correct 11 ms 12380 KB Output is correct
14 Correct 11 ms 12380 KB Output is correct
15 Correct 12 ms 12464 KB Output is correct
16 Correct 10 ms 11100 KB Output is correct
17 Correct 10 ms 11100 KB Output is correct
18 Correct 10 ms 11356 KB Output is correct
19 Correct 10 ms 11100 KB Output is correct
20 Correct 10 ms 11132 KB Output is correct

Subtask #2
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 12376 KB Output is correct
2 Correct 12 ms 12376 KB Output is correct
3 Correct 11 ms 12380 KB Output is correct
4 Correct 11 ms 12504 KB Output is correct
5 Correct 11 ms 12380 KB Output is correct
6 Correct 11 ms 12380 KB Output is correct
7 Correct 12 ms 12636 KB Output is correct
8 Correct 11 ms 12376 KB Output is correct
9 Correct 11 ms 12460 KB Output is correct
10 Correct 11 ms 12368 KB Output is correct
11 Correct 11 ms 12376 KB Output is correct
12 Correct 11 ms 12412 KB Output is correct
13 Correct 11 ms 12380 KB Output is correct
14 Correct 11 ms 12380 KB Output is correct
15 Correct 12 ms 12464 KB Output is correct
16 Correct 10 ms 11100 KB Output is correct
17 Correct 10 ms 11100 KB Output is correct
18 Correct 10 ms 11356 KB Output is correct
19 Correct 10 ms 11100 KB Output is correct
20 Correct 10 ms 11132 KB Output is correct
21 Incorrect 172 ms 12544 KB Output isn't correct
22 Halted 0 ms 0 KB -

Subtask #3
0 / 27.0

# Verdict Execution time Memory Grader output
1 Runtime error 6 ms 9168 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #4
0 / 42.0

# Verdict Execution time Memory Grader output
1 Correct 11 ms 12376 KB Output is correct
2 Correct 12 ms 12376 KB Output is correct
3 Correct 11 ms 12380 KB Output is correct
4 Correct 11 ms 12504 KB Output is correct
5 Correct 11 ms 12380 KB Output is correct
6 Correct 11 ms 12380 KB Output is correct
7 Correct 12 ms 12636 KB Output is correct
8 Correct 11 ms 12376 KB Output is correct
9 Correct 11 ms 12460 KB Output is correct
10 Correct 11 ms 12368 KB Output is correct
11 Correct 11 ms 12376 KB Output is correct
12 Correct 11 ms 12412 KB Output is correct
13 Correct 11 ms 12380 KB Output is correct
14 Correct 11 ms 12380 KB Output is correct
15 Correct 12 ms 12464 KB Output is correct
16 Correct 10 ms 11100 KB Output is correct
17 Correct 10 ms 11100 KB Output is correct
18 Correct 10 ms 11356 KB Output is correct
19 Correct 10 ms 11100 KB Output is correct
20 Correct 10 ms 11132 KB Output is correct
21 Incorrect 172 ms 12544 KB Output isn't correct
22 Halted 0 ms 0 KB -