Submission #702512

#	Time	Username	Problem	Language	Result	Execution time	Memory
702512		zyq_	Misspelling (JOI22_misspelling)	C++17	100 / 100	546 ms	378584 KiB

misspelling

#include <bits/stdc++.h>
using namespace std;
#define int long long
const long long MOD = 1e9 + 7;
int N, M;
int inp1, inp2;
deque<pair<int, int> >  v1, v2;
int dv[500010][30], v[500010][30], prefix[500010][30];
int pow6[500010];
bool active[500010];
vector<pair<int, int> > curstack;
int lastl1[500010];
int lastl2[500010];
bool lasplace[500010][2];


int32_t main(){
    ios::sync_with_stdio(0);
    cin.tie(0);
    pow6[0] = 1;
    for(int a=1; a<500010; a++){
        pow6[a] = pow6[a-1] * 26;
        pow6[a] %= MOD;
    }
    cin >> N >> M;
    for(int a=0; a<M; a++){
        cin >> inp1 >> inp2;
        if(inp1 < inp2){
            //then larger then
            v1.push_back({inp1, inp2-1});
        }
        else{
            v2.push_back({inp2, inp1-1});
        }
    }
    sort(v1.begin(), v1.end());
    sort(v2.begin(), v2.end());
    for(int a=1; a<=N; a++){
        while(!curstack.empty() && curstack.back().second < a){
            curstack.pop_back();
        }
        while(!v1.empty() && v1[0].first <= a){
            curstack.push_back(v1[0]);
            v1.pop_front();
        }
        lastl1[a] = (curstack.empty() ? INT_MAX : curstack.back().first-1);
    }
    for(int a=1; a<=N; a++){
        while(!curstack.empty() && curstack.back().second < a){
            curstack.pop_back();
        }
        while(!v2.empty() && v2[0].first <= a){
            curstack.push_back(v2[0]);
            v2.pop_front();
        }
        lastl2[a] = (curstack.empty() ? INT_MAX : curstack.back().first-1);
    }
    for(int a=1; a<=N; a++){
        //cout << lastl1[a] << ' ' << lastl2[a] << '\n';
    }
    for(int a=1; a<=26; a++){
        dv[0][a] = 1LL;
        prefix[0][a] = (long long)a;
        v[0][a] = 0LL;
    }
    for(int a=1; a<N; a++){
        int sm = 0;
        for(int b=1; b<=26; b++){
            sm += v[a-1][b];
            sm %= MOD;
            if(sm < 0) sm += MOD; 
        }
        for(int b=1; b<=26; b++){
            v[a][b] = sm;
        }
        for(int b=1; b<=26; b++){
            if(lastl1[a] != INT_MAX){
                //v[a][b] += (prefix[lastl1[a]][26] - prefix[lastl1[a]][b]) % MOD;
                v[a][b] += prefix[lastl1[a]][b-1];
            }
            v[a][b] %= MOD;
            if(v[a][b] < 0) v[a][b] += MOD;
            if(lastl2[a] != INT_MAX){
                //v[a][b] += prefix[lastl2[a]][b-1];
                v[a][b] += (prefix[lastl2[a]][26] - prefix[lastl2[a]][b]) % MOD;
            }
            v[a][b] %= MOD;
            if(v[a][b] < 0) v[a][b] += MOD;
        }
        for(int b=1; b<=26; b++){
            dv[a][b] = pow6[a] - v[a][b];
            dv[a][b] %= MOD;
            if(dv[a][b] < 0) dv[a][b] += MOD;
            prefix[a][b] = prefix[a][b-1] + dv[a][b];
            prefix[a][b] %= MOD;
            if(prefix[a][b] < 0) prefix[a][b] += MOD;
        }
    }
    cout << prefix[N-1][26];
}

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