Submission #1198006

#	Time	Username	Problem	Language	Result	Execution time	Memory
1198006		12345678	Lucky Numbers (RMI19_lucky)	C++20	28 / 100	560 ms	840 KiB

lucky

#include <bits/stdc++.h>

using namespace std;

const int nx=1e5+5, mod=1e9+7;

#define ll long long

ll n, q, t, l, r, s[nx], dp[nx][4], f, pre[10][4][4]; // dp[digit][not 3 / anything][tight?]
char c;

void precompute()
{
    for (int cur=0; cur<=9; cur++)
    {
        for (int i=0; i<4; i++)
        {
            int any=i%2, tight=i/2;
            int lb=0, ub=tight?cur:9;
            for (int d=lb; d<=ub; d++)
            {
                if (any)
                {
                    if (d==1) pre[cur][i][2*(tight&(d==ub))]++;
                    else pre[cur][i][2*(tight&(d==ub))+1]++;
                }
                else
                {
                    if (d!=3)
                    {
                        if (d==1) pre[cur][i][2*(tight&(d==ub))]++;
                        else pre[cur][i][2*(tight&(d==ub))+1]++;
                    }
                }
            }
        }
    }
}

int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>n>>q;
    q++;
    for (int i=1; i<=n; i++) cin>>c, s[i]=c-'0';
    precompute();
    while (q--)
    {
        if (!f) f=1, t=1, l=1, r=n;
        else cin>>t>>l>>r;
        if (t==1)
        {
            for (int i=l; i<=r; i++) for (int j=0; j<4; j++) dp[i][j]=0;
            for (int j=0; j<4; j++) dp[r+1][j]=1;
            for (int i=r; i>=l; i--)
            {
                for (int j=0; j<4; j++)
                {
                    for (int k=0; k<4; k++) dp[i][j]=(dp[i][j]+pre[s[i]][j][k]*dp[i+1][k])%mod;
                }
            }
            cout<<dp[l][3]<<'\n';
        }
        else s[l]=r;
    }
}

• Subtask 1: 14 / 14
• Subtask 2: 14 / 14
• Subtask 3: 0 / 9
• Subtask 4: 0 / 27
• Subtask 5: 0 / 9
• Subtask 6: 0 / 27