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Submission #351309

# Submission time Handle Problem Language Result Execution time Memory
351309 2021-01-20T00:12:43 Z AmineWeslati Boat (APIO16_boat) C++14
9 / 100
 2000 ms 10220 KB 
//Never stop trying
#include "bits/stdc++.h"
using namespace std;
#define boost ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)

typedef long long ll;
#define int ll
typedef string str;
typedef long double ld;
typedef pair<int, int> pi;
#define fi first
#define se second
typedef vector<int> vi;
typedef vector<pi> vpi;
#define pb push_back
#define eb emplace_back
#define sz(x) (int)x.size()
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
#define endl "\n"
#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)

const int MOD = 1e9 + 7; //998244353
const ll INF = 1e18;
const int MX = 1000 + 10;
const int nx[4] = {0, 0, 1, -1}, ny[4] = {1, -1, 0, 0}; //right left down up

template<class T> using V = vector<T>;
template<class T> bool ckmin(T& a, const T& b) { return a > b ? a = b, 1 : 0; }
template<class T> bool ckmax(T& a, const T& b) { return a < b ? a = b, 1 : 0; }
ll cdiv(ll a, ll b) { return a / b + ((a ^ b) > 0 && a % b); } // divide a by b rounded up
//constexpr int log2(int x) { return 31 - __builtin_clz(x); } // floor(log2(x))

mt19937 rng(chrono::system_clock::now().time_since_epoch().count());
//mt19937_64 rng(chrono::system_clock::now().time_since_epoch().count());
ll random(ll a, ll b){
    return a + rng() % (b - a + 1);
}
#ifndef LOCAL  
#define cerr if(false) cerr
#endif
#define dbg(x) cerr << #x << " : " << x << endl; 
#define dbgs(x,y) cerr << #x << " : " << x << " / " << #y << " : " << y << endl;
#define dbgv(v) cerr << #v << " : " << "[ "; for(auto it : v) cerr << it << ' '; cerr << ']' << endl;
#define here() cerr << "here" << endl;

void IO() {
#ifdef LOCAL
    freopen("input.txt", "r", stdin); 
    freopen("output.txt", "w", stdout);
#endif
}
/////////////////////////ONLY CLEAN CODES ALLOWED/////////////////////////

int N; 
vpi vec;
vi v[MX],c(MX);
int memo[MX][MX];

int modpow(int x, int p){
	if(!p) return 1;
	int v=modpow(x,p/2);
	v*=v; v%=MOD;
	if(p%2==1) v*=x,v%=MOD;

	return v;
}
int modinv(int x){
	return modpow(x,MOD-2);
}

int C(int n, int k){
	if(k>n) return 0;
	int ans=1;
	FOR(i,n-k+1,n+1) ans*=i,ans%=MOD;
	FOR(i,1,k+1) ans*=modinv(i),ans%=MOD; 

	return ans;
}

int solve(int i, int mx){
	if(i==N*2-1){
		if(!mx) return 0;
		return 1;
	}

	int &ind=memo[i][mx];
	if(ind!=-1) return ind;

	int ans=solve(i+1,mx);
	int cnt=0;


	vi coef(N+1,-1);
	for(auto j: v[i]) if(j>mx){
		cnt++;

		int val=0;
		FOR(n,1,cnt+1){
			if(coef[n]==-1) 
				coef[n]=C(c[i],n);
			val+=coef[n];
		}

		ans+=(solve(i+1,j)*val)%MOD;
		ans%=MOD;
	}
	return ind=ans;
}

int32_t main() {
    boost; IO();

    cin>>N;
    FOR(i,1,N+1){
    	int l,r; cin>>l>>r;
    	vec.eb(l,i);
    	vec.eb(r+1,-i);	
    }
    sort(all(vec));

    set<int>cur;
    FOR(i,0,sz(vec)-1){
    	int idx=vec[i].se;
    	if(idx>0) cur.insert(idx);
    	else cur.erase(-idx);

    	for(auto y: cur) v[i].pb(y);
    	c[i]=vec[i+1].fi-vec[i].fi;
    }

    memset(memo,-1,sizeof(memo));
    cout << solve(0,0) << endl;

    return 0;
}
//Change your approach

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 178 ms 8684 KB Output is correct
2 Correct 178 ms 8556 KB Output is correct
3 Correct 177 ms 8556 KB Output is correct
4 Correct 177 ms 8556 KB Output is correct
5 Correct 177 ms 8556 KB Output is correct
6 Correct 193 ms 8668 KB Output is correct
7 Correct 195 ms 8556 KB Output is correct
8 Correct 191 ms 8604 KB Output is correct
9 Correct 192 ms 8556 KB Output is correct
10 Correct 196 ms 8684 KB Output is correct
11 Correct 193 ms 8684 KB Output is correct
12 Correct 196 ms 8556 KB Output is correct
13 Correct 199 ms 8556 KB Output is correct
14 Correct 194 ms 8556 KB Output is correct
15 Correct 191 ms 8576 KB Output is correct
16 Correct 172 ms 8556 KB Output is correct
17 Correct 173 ms 8616 KB Output is correct
18 Correct 172 ms 8684 KB Output is correct
19 Correct 173 ms 8684 KB Output is correct
20 Correct 171 ms 8556 KB Output is correct

Subtask #2
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 178 ms 8684 KB Output is correct
2 Correct 178 ms 8556 KB Output is correct
3 Correct 177 ms 8556 KB Output is correct
4 Correct 177 ms 8556 KB Output is correct
5 Correct 177 ms 8556 KB Output is correct
6 Correct 193 ms 8668 KB Output is correct
7 Correct 195 ms 8556 KB Output is correct
8 Correct 191 ms 8604 KB Output is correct
9 Correct 192 ms 8556 KB Output is correct
10 Correct 196 ms 8684 KB Output is correct
11 Correct 193 ms 8684 KB Output is correct
12 Correct 196 ms 8556 KB Output is correct
13 Correct 199 ms 8556 KB Output is correct
14 Correct 194 ms 8556 KB Output is correct
15 Correct 191 ms 8576 KB Output is correct
16 Correct 172 ms 8556 KB Output is correct
17 Correct 173 ms 8616 KB Output is correct
18 Correct 172 ms 8684 KB Output is correct
19 Correct 173 ms 8684 KB Output is correct
20 Correct 171 ms 8556 KB Output is correct
21 Execution timed out 2088 ms 10220 KB Time limit exceeded
22 Halted 0 ms 0 KB -

Subtask #3
0 / 27.0

# Verdict Execution time Memory Grader output
1 Incorrect 999 ms 8588 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 42.0

# Verdict Execution time Memory Grader output
1 Correct 178 ms 8684 KB Output is correct
2 Correct 178 ms 8556 KB Output is correct
3 Correct 177 ms 8556 KB Output is correct
4 Correct 177 ms 8556 KB Output is correct
5 Correct 177 ms 8556 KB Output is correct
6 Correct 193 ms 8668 KB Output is correct
7 Correct 195 ms 8556 KB Output is correct
8 Correct 191 ms 8604 KB Output is correct
9 Correct 192 ms 8556 KB Output is correct
10 Correct 196 ms 8684 KB Output is correct
11 Correct 193 ms 8684 KB Output is correct
12 Correct 196 ms 8556 KB Output is correct
13 Correct 199 ms 8556 KB Output is correct
14 Correct 194 ms 8556 KB Output is correct
15 Correct 191 ms 8576 KB Output is correct
16 Correct 172 ms 8556 KB Output is correct
17 Correct 173 ms 8616 KB Output is correct
18 Correct 172 ms 8684 KB Output is correct
19 Correct 173 ms 8684 KB Output is correct
20 Correct 171 ms 8556 KB Output is correct
21 Execution timed out 2088 ms 10220 KB Time limit exceeded
22 Halted 0 ms 0 KB -