Submission #710364

#	Time	Username	Problem	Language	Result	Execution time	Memory
710364		victor_gao	Lamps (JOI19_lamps)	C++17	100 / 100	119 ms	82588 KiB

lamp

//#pragma GCC optimize("Ofast,unroll-loops,O3")
//#pragma GCC optimize("avx,avx2,sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,fma,tune=native")
#include<bits/stdc++.h>
//#include<bits/extc++.h>
//#pragma pack(1)
#define fast ios::sync_with_stdio(0); cin.tie(0);
#define int long long
#define pii pair<int,int>
#define x first
#define y second
#define N 1000015
using namespace std;
//using namespace __gnu_pbds;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
//typedef tree<int, null_type,less_equal<int>, rb_tree_tag,tree_order_statistics_node_update> order_multiset;
//typedef tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update> order_set;
int n,dp[N][10];
int dis[10][10];
char a[N],b[N];
/*
前 i 個都是處理好的
00 沒影響
01 有設為 0
02 有設為 1
10 有 ^ 一次
11 先設為 0 再 ^
12 先設為 1 再 ^
*/ 
signed main(){
    fast
    for (int i=0;i<10;i++){
        for (int j=0;j<10;j++){
            int x1=i%3,y1=i/3;
            int x2=j%3,y2=j/3;
            dis[i][j]=(y2-y1>0);
            if (x1!=x2){
                if (x2!=0) dis[i][j]++;
            }
        }
    }
    cin>>n;
    for (int i=1;i<=n;i++)
        cin>>a[i];
    for (int i=1;i<=n;i++)
        cin>>b[i];
    for (int i=0;i<=n+1;i++)
        for (int j=0;j<9;j++)
            dp[i][j]=1e9;
    dp[0][0]=0;
    for (int i=0;i<n;i++){
        for (int j=0;j<6;j++){
            if (dp[i][j]>1e8) continue;
            for (int k=0;k<6;k++){
                int goal=b[i+1]-'0';
                int now=a[i+1]-'0';
                if (k%3==1) now=0;
                else if (k%3==2) now=1;
                if (k/3) now^=1;
                if (now==goal){
                    dp[i+1][k]=min(dp[i+1][k],dp[i][j]+dis[j][k]);
                }
            }
        }
    }
    int ans=1e9;
    for (int i=0;i<6;i++)
        ans=min(ans,dp[n][i]);
    cout<<ans<<'\n';
}

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