Submission #1043712

#	Time	Username	Problem	Language	Result	Execution time	Memory
1043712		MarwenElarbi	Misspelling (JOI22_misspelling)	C++17	0 / 100	5 ms	25176 KiB

misspelling

#include <bits/stdc++.h>
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#define ll long long
#define pb push_back
#define fi first
#define se second
#define optimise ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
using namespace std;
const int nax=5e5+5;
const int MOD=1e9+7;
int n,k;
long long dp[nax][26];
vector<int> up[nax];
vector<int> down[nax];
long long sum_up[26];
long long sum_down[26];
int main(){
    optimise;
    #ifndef ONLINE_JUDGE
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
    #endif
    cin>>n>>k;
    for (int i = 0; i < k; ++i)
    {
        int x,y;
        cin>>x>>y;
        if(x==y) continue;
        if(x>y){
            up[y].pb(x);
        }else{
            down[x].pb(y);
        }
    }
    for (int i = 0; i < 26; ++i)
    {
        dp[n][i]=1;
    }
    set<int> s,t;
    for (int i = n-1; i >= 1; --i)
    {
        s.insert(i+1);
        t.insert(i+1);
        for (int j = 0; j < 26; ++j)
        {
            sum_up[j]+=dp[i+1][j];
            sum_down[j]+=dp[i+1][j];
        }
        for(auto u:up[i]){
            auto it=s.lower_bound(i+1);
            while(it!=s.end() && (*it)<=u){
                for (int j = 0; j < 26; ++j) sum_up[j]-=dp[(*it)][j];
                    it=s.erase(it);
            }
        }
        for(auto u:down[i]){
            auto it=t.lower_bound(i+1);
            while(it!=t.end() && (*it)<=u){
                for (int j = 0; j < 26; ++j) sum_down[j]-=dp[(*it)][j];
                    it=t.erase(it);
            }
        }
        long long sum=0;
        for (int j = 0; j < 26; ++j)
        {
            dp[i][j]+=sum;
            sum+=sum_down[j];
        }
        sum=0;
        for (int j = 25; j >= 0; --j)
        {
            dp[i][j]+=sum;
            sum+=sum_up[j];
        }
        for (int j = 0; j < 26; ++j)
        {
            dp[i][j]++;
            dp[i][j]%=MOD;
        }
    }
    long long ans=0;
    for (int i = 0; i < 26; ++i)
    {
        ans+=dp[1][i];
        ans%=MOD;
    }
    cout <<ans<<endl;
}

Compilation message (stderr)

misspelling.cpp: In function 'int main()':
misspelling.cpp:21:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 |         freopen("input.txt", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
misspelling.cpp:22:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |         freopen("output.txt", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 8
• Subtask 2: 0 / 20
• Subtask 3: 0 / 29
• Subtask 4: 0 / 32
• Subtask 5: 0 / 11