oj.uz

Submission #404452

# Submission time Handle Problem Language Result Execution time Memory
404452 2021-05-14T12:25:41 Z CursedCode Boat (APIO16_boat) C++14
9 / 100
 606 ms 16300 KB 
#include <bits/stdc++.h>
#define ll long long
const ll MOD=1000000007;
using namespace std;
ll n,k;
ll l[505],r[505],dp[505][1005],val[1005],cnt[505][1005],c[505][1005],sum[505][1005],len[1005];
unordered_map<ll,ll>um;
set<ll>s;
ll power(ll x,ll y){
	ll res=1;
	while(y){
		if(y&1){
			res=res*x;
			if(res>=MOD) res%=MOD;
		}
		y>>=1;
		x=x*x;
		if(x>=MOD) x%=MOD;
	}
	return res;
}
int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	cin >> n;
	for(ll i=1;i<=n;i++){
		cin >> l[i] >> r[i];
		s.insert(l[i]);
		s.insert(r[i]+1);
	}
	for(auto i=s.begin();i!=s.end();++i){
		um[*i]=++k;
		val[k]=*i;
		if(k>1) len[k-1]=val[k]-val[k-1];
	}
	for(ll i=1;i<k;i++){
		c[i][0]=1;
		for(ll j=1;j<=n;j++){
			if(j>len[i]) sum[i][j]=sum[i][j-1];
			else{	
				c[i][j]=c[i][j-1]*(len[i]+1-j);
				if(c[i][j]>=MOD) c[i][j]%=MOD;
				c[i][j]*=power(j,MOD-2);
				if(c[i][j]>=MOD) c[i][j]%=MOD;
				sum[i][j]=sum[i][j-1]+c[i][j];
				if(sum[i][j]>=MOD) sum[i][j]%=MOD;
			}
			// cout << i << ' ' << j << ' ' << c[i][j] << '\n';
		}
	}
	for(ll i=1;i<=n;i++){
		for(ll j=1;j<k;j++){
			if(l[i]<=val[j] && val[j]<=r[i]){
				cnt[i][j]=cnt[i-1][j]+1;
			}
			else cnt[i][j]=cnt[i-1][j];
			// cout << i << ' ' << j << ' ' << cnt[i][j] << '\n';
		}
	}
	for(ll i=0;i<=n;i++){dp[i][0]=1;}
	for(ll i=0;i<=n;i++){
		for(ll j=1;j<k;j++){
			dp[i][j]+=dp[i][j-1];
			if(dp[i][j]>=MOD) dp[i][j]%=MOD;
			for(ll t=0;t<i;t++){
				if(l[t+1]<=val[j] && val[j]<=r[t+1]){
					ll p=cnt[i][j]-cnt[t][j];
					dp[i][j]+=(dp[t][j-1]*sum[j][p]);
					if(dp[i][j]>=MOD) dp[i][j]%=MOD;
				}
				// if(i==1 && j==2) cout << cnt[i][j] << '\n';
			}
			// cout << i << ' ' << j << ' ' << dp[i][j] << '\n';
		}
	}
	cout << (dp[n][k-1]-1+MOD)%MOD;
}

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 326 ms 16212 KB Output is correct
2 Correct 326 ms 16108 KB Output is correct
3 Correct 319 ms 16196 KB Output is correct
4 Correct 342 ms 16300 KB Output is correct
5 Correct 358 ms 16120 KB Output is correct
6 Correct 207 ms 16108 KB Output is correct
7 Correct 207 ms 16196 KB Output is correct
8 Correct 206 ms 16296 KB Output is correct
9 Correct 210 ms 16196 KB Output is correct
10 Correct 247 ms 16112 KB Output is correct
11 Correct 208 ms 16196 KB Output is correct
12 Correct 210 ms 16220 KB Output is correct
13 Correct 218 ms 16176 KB Output is correct
14 Correct 195 ms 16208 KB Output is correct
15 Correct 228 ms 16108 KB Output is correct
16 Correct 68 ms 8076 KB Output is correct
17 Correct 72 ms 8492 KB Output is correct
18 Correct 70 ms 8236 KB Output is correct
19 Correct 74 ms 8472 KB Output is correct
20 Correct 72 ms 8312 KB Output is correct

Subtask #2
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 326 ms 16212 KB Output is correct
2 Correct 326 ms 16108 KB Output is correct
3 Correct 319 ms 16196 KB Output is correct
4 Correct 342 ms 16300 KB Output is correct
5 Correct 358 ms 16120 KB Output is correct
6 Correct 207 ms 16108 KB Output is correct
7 Correct 207 ms 16196 KB Output is correct
8 Correct 206 ms 16296 KB Output is correct
9 Correct 210 ms 16196 KB Output is correct
10 Correct 247 ms 16112 KB Output is correct
11 Correct 208 ms 16196 KB Output is correct
12 Correct 210 ms 16220 KB Output is correct
13 Correct 218 ms 16176 KB Output is correct
14 Correct 195 ms 16208 KB Output is correct
15 Correct 228 ms 16108 KB Output is correct
16 Correct 68 ms 8076 KB Output is correct
17 Correct 72 ms 8492 KB Output is correct
18 Correct 70 ms 8236 KB Output is correct
19 Correct 74 ms 8472 KB Output is correct
20 Correct 72 ms 8312 KB Output is correct
21 Incorrect 606 ms 15772 KB Output isn't correct
22 Halted 0 ms 0 KB -

Subtask #3
0 / 27.0

# Verdict Execution time Memory Grader output
1 Incorrect 10 ms 3276 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 42.0

# Verdict Execution time Memory Grader output
1 Correct 326 ms 16212 KB Output is correct
2 Correct 326 ms 16108 KB Output is correct
3 Correct 319 ms 16196 KB Output is correct
4 Correct 342 ms 16300 KB Output is correct
5 Correct 358 ms 16120 KB Output is correct
6 Correct 207 ms 16108 KB Output is correct
7 Correct 207 ms 16196 KB Output is correct
8 Correct 206 ms 16296 KB Output is correct
9 Correct 210 ms 16196 KB Output is correct
10 Correct 247 ms 16112 KB Output is correct
11 Correct 208 ms 16196 KB Output is correct
12 Correct 210 ms 16220 KB Output is correct
13 Correct 218 ms 16176 KB Output is correct
14 Correct 195 ms 16208 KB Output is correct
15 Correct 228 ms 16108 KB Output is correct
16 Correct 68 ms 8076 KB Output is correct
17 Correct 72 ms 8492 KB Output is correct
18 Correct 70 ms 8236 KB Output is correct
19 Correct 74 ms 8472 KB Output is correct
20 Correct 72 ms 8312 KB Output is correct
21 Incorrect 606 ms 15772 KB Output isn't correct
22 Halted 0 ms 0 KB -