oj.uz

Submission #1092803

# Submission time Handle Problem Language Result Execution time Memory
1092803 2024-09-25T07:26:07 Z alexander707070 Boat (APIO16_boat) C++14
0 / 100
 2000 ms 326000 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;
 
pair<int,int> s[MAXN];
 
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);
        }
    }

	random_shuffle(a+1,a+n+1);
    for(int i=1;i<=n;i++)b[i]=a[i];
 
    pos.push_back(0);
    sort(pos.begin(),pos.end());
 
    for(int i=0;i<pos.size();i++)where[pos[i]]=i;
 
    for(int i=1;i<=n;i++){
        s[i]={where[a[i]],where[b[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,s[i].first-1,min(f,s[i].second)-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:51:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 |     for(int i=0;i<pos.size();i++)where[pos[i]]=i;
      |                 ~^~~~~~~~~~~
boat.cpp:57:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   57 |     for(int i=0;i<pos.size();i++){
      |                 ~^~~~~~~~~~~
boat.cpp:62:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   62 |         for(int f=0;f<pos.size();f++){
      |                     ~^~~~~~~~~~~

Subtask #1
0 / 9.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 348 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 22.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 348 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 27.0

# Verdict Execution time Memory Grader output
1 Execution timed out 2033 ms 326000 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #4
0 / 42.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 348 KB Output isn't correct
2 Halted 0 ms 0 KB -