oj.uz

Submission #1092692

# Submission time Handle Problem Language Result Execution time Memory
1092692 2024-09-24T18:26:23 Z alexander707070 Boat (APIO16_boat) C++14
9 / 100
 2000 ms 329480 KB 
#include<bits/stdc++.h>
#pragma GCC optimize ("O3")
#pragma GCC target ("sse4")

#define MAXN 507
using namespace std;

const long long mod=1e9+7;

int n,a[MAXN],b[MAXN];
vector<int> pos;
map<int,bool> mp;
unordered_map<int,int> where;

long long dp[2][1000007];
long long pref[2][1000007];

long long sum(int id,int from,int to){
    if(from>to)return 0;

    if(from>0)return (pref[id][to]-pref[id][from-1]);
    return pref[id][to];
}

int main(){

    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>a[i]>>b[i];

        for(int f=a[i];f<=b[i];f++){
            if(mp[f])continue;

            mp[f]=true;
            pos.push_back(f);
        }
    }

    pos.push_back(0);
    sort(pos.begin(),pos.end());

    for(int i=0;i<pos.size();i++)where[pos[i]]=i;

    for(int i=0;i<pos.size();i++){
        pref[0][i]=i+1; dp[0][i]=1;
    }

    for(int i=1;i<=n;i++){
        for(int f=0;f<pos.size();f++){

            dp[i%2][f]=(sum(1-i%2,where[a[i]]-1,min(f,where[b[i]])-1) + dp[1-i%2][f])%mod; 

            pref[i%2][f]=dp[i%2][f];
            if(f>0)pref[i%2][f]+=pref[i%2][f-1];
        }
    }

    cout<<dp[n%2][pos.size()-1]-1<<"\n";
 
    return 0;
}

Compilation message

boat.cpp: In function 'int main()':
boat.cpp:46:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   46 |     for(int i=0;i<pos.size();i++)where[pos[i]]=i;
      |                 ~^~~~~~~~~~~
boat.cpp:48:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   48 |     for(int i=0;i<pos.size();i++){
      |                 ~^~~~~~~~~~~
boat.cpp:53:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   53 |         for(int f=0;f<pos.size();f++){
      |                     ~^~~~~~~~~~~

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 348 KB Output is correct
2 Correct 3 ms 576 KB Output is correct
3 Correct 3 ms 484 KB Output is correct
4 Correct 3 ms 348 KB Output is correct
5 Correct 3 ms 344 KB Output is correct
6 Correct 3 ms 348 KB Output is correct
7 Correct 3 ms 348 KB Output is correct
8 Correct 3 ms 348 KB Output is correct
9 Correct 3 ms 348 KB Output is correct
10 Correct 3 ms 344 KB Output is correct
11 Correct 4 ms 572 KB Output is correct
12 Correct 3 ms 348 KB Output is correct
13 Correct 3 ms 348 KB Output is correct
14 Correct 4 ms 352 KB Output is correct
15 Correct 3 ms 352 KB Output is correct
16 Correct 1 ms 352 KB Output is correct
17 Correct 1 ms 352 KB Output is correct
18 Correct 1 ms 352 KB Output is correct
19 Correct 1 ms 476 KB Output is correct
20 Correct 1 ms 352 KB Output is correct

Subtask #2
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 348 KB Output is correct
2 Correct 3 ms 576 KB Output is correct
3 Correct 3 ms 484 KB Output is correct
4 Correct 3 ms 348 KB Output is correct
5 Correct 3 ms 344 KB Output is correct
6 Correct 3 ms 348 KB Output is correct
7 Correct 3 ms 348 KB Output is correct
8 Correct 3 ms 348 KB Output is correct
9 Correct 3 ms 348 KB Output is correct
10 Correct 3 ms 344 KB Output is correct
11 Correct 4 ms 572 KB Output is correct
12 Correct 3 ms 348 KB Output is correct
13 Correct 3 ms 348 KB Output is correct
14 Correct 4 ms 352 KB Output is correct
15 Correct 3 ms 352 KB Output is correct
16 Correct 1 ms 352 KB Output is correct
17 Correct 1 ms 352 KB Output is correct
18 Correct 1 ms 352 KB Output is correct
19 Correct 1 ms 476 KB Output is correct
20 Correct 1 ms 352 KB Output is correct
21 Correct 56 ms 1108 KB Output is correct
22 Correct 56 ms 1112 KB Output is correct
23 Correct 54 ms 996 KB Output is correct
24 Correct 60 ms 1000 KB Output is correct
25 Correct 66 ms 1112 KB Output is correct
26 Correct 38 ms 856 KB Output is correct
27 Correct 38 ms 856 KB Output is correct
28 Correct 36 ms 868 KB Output is correct
29 Correct 38 ms 868 KB Output is correct
30 Execution timed out 2058 ms 123960 KB Time limit exceeded
31 Halted 0 ms 0 KB -

Subtask #3
0 / 27.0

# Verdict Execution time Memory Grader output
1 Execution timed out 2110 ms 329480 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #4
0 / 42.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 348 KB Output is correct
2 Correct 3 ms 576 KB Output is correct
3 Correct 3 ms 484 KB Output is correct
4 Correct 3 ms 348 KB Output is correct
5 Correct 3 ms 344 KB Output is correct
6 Correct 3 ms 348 KB Output is correct
7 Correct 3 ms 348 KB Output is correct
8 Correct 3 ms 348 KB Output is correct
9 Correct 3 ms 348 KB Output is correct
10 Correct 3 ms 344 KB Output is correct
11 Correct 4 ms 572 KB Output is correct
12 Correct 3 ms 348 KB Output is correct
13 Correct 3 ms 348 KB Output is correct
14 Correct 4 ms 352 KB Output is correct
15 Correct 3 ms 352 KB Output is correct
16 Correct 1 ms 352 KB Output is correct
17 Correct 1 ms 352 KB Output is correct
18 Correct 1 ms 352 KB Output is correct
19 Correct 1 ms 476 KB Output is correct
20 Correct 1 ms 352 KB Output is correct
21 Correct 56 ms 1108 KB Output is correct
22 Correct 56 ms 1112 KB Output is correct
23 Correct 54 ms 996 KB Output is correct
24 Correct 60 ms 1000 KB Output is correct
25 Correct 66 ms 1112 KB Output is correct
26 Correct 38 ms 856 KB Output is correct
27 Correct 38 ms 856 KB Output is correct
28 Correct 36 ms 868 KB Output is correct
29 Correct 38 ms 868 KB Output is correct
30 Execution timed out 2058 ms 123960 KB Time limit exceeded
31 Halted 0 ms 0 KB -