Submission #1184432

#	Time	Username	Problem	Language	Result	Execution time	Memory
1184432		sasde	Palindrome-Free Numbers (BOI13_numbers)	C++20	100 / 100	1 ms	532 KiB

numbers

#include<bits/stdc++.h>
#define task "strdel"
#define ii pair<int,int>
#define iii pair<int,ii>
#define iv pair<ii,ii>
#define se second
#define fi first
#define ffi fi.fi
#define sfi se.fi
#define sse se.se
#define fse fi.se
#define lt(i, c, d) for(int i = c; i <= d; ++i)
#define fl(i, c, d) for(int i = d; i >= c; --i)
#define pb push_back
#define emb emplace_back
#define emf emplace_front
#define em emplace
using namespace std;
const int N=1e6+5,lg=20,mod=1e9+7;
mt19937 rd(chrono::steady_clock::now().time_since_epoch().count());
int Rand(int u,int v){
 return u+rd()%(v-u+1);
}
string a,b;
bool ok(string a){
    for(int i=0;i<a.size();++i){
        if(i+2<a.size()){
            if(a[i]==a[i+2])return false;
        }
        if(i+1<a.size()){
            if(a[i]==a[i+1])return false;
        }
    }
    return true;
}
int n;
string s;
long long f[20][2][12][12];
long long cc(int i,bool ok,int last,int last2){
    if(i>n)return 1;
    long long res=f[i][ok][last][last2];
    if(res!=-1)return res;
    res=0;
    for(int j=0;j<=9;++j)
        if(ok||s[i]>=j+'0'){
    // cout <<i<<" "<<j<<" "<<last<<" "<<last2<<'\n';
        if(last!=11){
            if(j!=last&&j!=last2){
                res+=cc(i+1,ok||s[i]>j+'0',j,last);
            }
        }
        else{
            if(j==0){
                res+=cc(i+1,ok||s[i]>j+'0',last,last2);
            }
            else{
                res+=cc(i+1,ok||s[i]>j+'0',j,last);

            }
        }
    }
    return f[i][ok][last][last2]=res;
}
long long solve(string b){
    b=" "+b;
    s=b;
    n=b.size()-1;
    memset(f,-1,sizeof f);
    // cout <<s<<" "<<cc(1,false,11,11)<<'\n';
    return cc(1,false,11,11);
}
void solve(){
    cin >> a >> b;
    cout <<solve(b)-solve(a)+ok(a);
}
main()
{
  srand(time(0));
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    if(fopen(task".inp","r")){
      freopen(task".inp","r",stdin);
      freopen(task".out","w",stdout);
    }
    int t=1;
 //   cin >> t;
while(t--){
    solve();
    cout<<'\n';
}

}

Compilation message (stderr)

numbers.cpp:76:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   76 | main()
      | ^~~~
numbers.cpp: In function 'int main()':
numbers.cpp:83:14: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   83 |       freopen(task".inp","r",stdin);
      |       ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
numbers.cpp:84:14: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   84 |       freopen(task".out","w",stdout);
      |       ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 25 / 25
• Subtask 2: 75 / 75