Submission #895307

#	Time	Username	Problem	Language	Result	Execution time	Memory
895307		alexander707070	Misspelling (JOI22_misspelling)	C++14	28 / 100	4045 ms	171856 KiB

misspelling

#include<bits/stdc++.h>
#define MAXN 2007
using namespace std;

const int mod=1e9+7;

int n,m,a,b,ans;

int dp[MAXN][MAXN][30];
bool li[MAXN][MAXN][30];

int cnt[MAXN],pref[MAXN],cnt2[MAXN],pref2[MAXN];
int maxs[MAXN][MAXN],maxs2[MAXN][MAXN],es[MAXN],es2[MAXN];

bool open(int l,int r){
    return maxs[l][r]>=r;
}

bool open2(int l,int r){
    return maxs2[l][r]>=r;
}

int ff(int pos,int change,int last){
    if(pos==n+1)return 1;

    if(li[pos][change][last])return dp[pos][change][last];
    li[pos][change][last]=true;

    if(last!=26)dp[pos][change][last]=ff(pos+1,change,last);

    for(int i=0;i<26;i++){
        if(i==last)continue;
        if(i<last and open(change+1,pos))continue;
        if(i>last and open2(change+1,pos))continue;

        dp[pos][change][last]+=ff(pos+1,pos,i);   
        dp[pos][change][last]%=mod;     
    }

    return dp[pos][change][last];
}


int main(){

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

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

        if(a<b){
            cnt[a+1]++;
            es[a+1]=max(es[a+1],b);

            pref[a+1]++; pref[b+1]--;
        }else{
            cnt2[b+1]++;
            es2[b+1]=max(es2[b+1],a);

            pref2[b+1]++; pref2[a+1]--;
        }
    }

    for(int i=1;i<=n;i++){
        for(int f=i;f<=n;f++){
            maxs[i][f]=max(maxs[i][f-1],es[f]);
            maxs2[i][f]=max(maxs2[i][f-1],es2[f]);
        }
    }

    cout<<ff(1,0,26)<<"\n";

    return 0;
}

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