Submission #1013837

#	Time	Username	Problem	Language	Result	Execution time	Memory
1013837		vjudge1	Lamps (JOI19_lamps)	C++17	100 / 100	82 ms	5588 KiB

lamp

//https://www.instagram.com/_modwwe/
#pragma GCC optimize("Ofast,unroll-loops")
//#pragma GCC target("avx2,bmi,bmi2")
#include<bits/stdc++.h>
//#define int long long
//#define ll long long
#define down cout<<'\n';
#define NHP     ios_base::sync_with_stdio(0);cout.tie(0);cin.tie(0);
#define modwwe  int t;cin>>t; while(t--)
#define bit(i,j) (i>>j&1)
#define sobit(a) __builtin_popcountll(a)
#define task "test"
#define fin(x) freopen(x".inp","r",stdin)
#define fou(x) freopen(x".out","w",stdout)
#define pb push_back
#define checktime   cerr << (double)clock() / CLOCKS_PER_SEC * 1000  << " ms";
using namespace std;
void phongbeo();
const int inf=1e18;
const int mod2=1e9+7;
const int  mod1=998244353;
struct icd
{
    int a,b;
};
struct ib
{
    int a;
    int b;
};
struct ic
{
    int a,b,c;
};
struct id
{
    int a,b,c,d;
};
struct ie
{
    int a,b,c, d,e,f;
 
};
int n,m,s1,s2,s4,s3,sf,k,r,mid,s5,s6,mx,s7,s8,s9,mx2,res,dem2=0,dem=0,l;
int  i,s10,s12;
int el=29;
main()
{
#ifndef ONLINE_JUDGE
///     fin(task),fou(task);
#endif
    NHP
    /// cin>>s1;
    // modwwe
    phongbeo(),down
}
string a,b;
int dp[4][4];
char as(char s,int x)
{
    if(x==0) return s;
    if(x==1) return '0';
    if(x==2) return '1';
    if(x==3&&s=='0') return '1';
    else return '0';
}
void phongbeo()
{
    cin>>n;
    ///a[0][0]->0
    cin>>a>>b;
    a=" "+a;
    b=" "+b;
        for(int j=0; j<4; j++)
            for(int z=0; z<4; z++)
                dp[j][z]=n+1;
    dp[0][0]=0;
    for(int i=1; i<=n; i++)
    {
        for(int j=0; j<4; j++)
            for(int z=0; z<4; z++)
                dp[0][0]=min(dp[j][z],dp[0][0]),
                            dp[j][0]=min(dp[j][0],dp[j][z]),
                                        dp[0][z]=min(dp[0][z],dp[j][z]);
        for(int z=1; z<4; z++)
            dp[0][z]=min(dp[0][z],dp[0][0]+1),
                        dp[z][0]=min(dp[z][0],dp[0][0]+1);
        for(int j=1; j<4; j++)
            for(int z=1; z<4; z++)
                dp[j][z]=min({dp[0][0]+2,dp[j][z],dp[0][z]+1,dp[j][0]+1});
        for(int j=0; j<4; j++)
            for(int z=0; z<4; z++)
            {
                char s=a[i];
                s=as(s,j);
                s=as(s,z);
                if(s!=b[i])
                    dp[j][z]=n+1;
            }
    }
    s2=n+1;
    for(int j=0; j<4; j++)
        for(int z=0; z<4; z++)
            s2=min(s2,dp[j][z]);
    cout<<s2;
}

Compilation message (stderr)

lamp.cpp:19:15: warning: overflow in conversion from 'double' to 'int' changes value from '1.0e+18' to '2147483647' [-Woverflow]
   19 | const int inf=1e18;
      |               ^~~~
lamp.cpp:47:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   47 | main()
      | ^~~~

• Subtask 1: 6 / 6
• Subtask 2: 41 / 41
• Subtask 3: 4 / 4
• Subtask 4: 49 / 49