제출 #1158555

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1158555		dosts	Lamps (JOI19_lamps)	C++20	0 / 100	1 ms	2376 KiB

lamp

#include <bits/stdc++.h>
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2")
using namespace std;
//#define int long long
#define pii pair<int,int>
#define ff first
#define ss second
#define sp << " " <<    
#define all(cont) cont.begin(),cont.end()
#define vi vector<int>

const int inf = 2e9,N = 1e6+1,MOD =  1e9+7;

#define chmin(a,b) a = min(a,b);



const int BUF_SZ=1<<20;
char buf[BUF_SZ];
int pos;
int len;
inline char gc() {
    if (pos == len) {
        pos = 0;
        len = (int)fread(buf, 1, BUF_SZ, stdin);
    }
    while(buf[pos]<'0'||'9'<buf[pos])pos++;
    return buf[pos++];
}
inline char next_char() {
    if (pos == len) {
        pos = 0;
        len = (int)fread(buf, 1, BUF_SZ, stdin);
    }
    return buf[pos++];
}
 
inline int read_int() {
    int x;
    char ch=next_char();
    while(ch<'0'||'9'<ch)ch=next_char();
    x = ch - '0';
    while (isdigit(ch = next_char())) { x = x * 10 + (ch - '0'); }
    return x;
}

const int BB=20;

char out[BB];
int curind=0;
inline void flush(){
    fwrite(out,1,curind,stdout);
    curind=0;
}
inline void putchar(char c){
    out[curind++]=c;
    if(curind==BB)flush();
}
char temp[10];
inline void putuint(int i){
    int lll=0;
    while(i){
        temp[lll++]=(i%10)+'0';
        i/=10;
    }
    while(lll){
        putchar(temp[--lll]);
    }
}

char a[N],b[N];

inline int now(const int& p,const int& t) {
    if (t < 2) return t;
    if (!p) return (t == 1);
    return (int)a[p-1];
};
void solve() {
    int n;
    n = read_int();
    for (int i = 0;i<n;i++) a[i] = gc();
    for (int i = 0;i<n;i++) b[i] = gc();
    for (auto& it : a) it-='0';
    for (auto& it : b) it-='0';
    int dp[3],dp2[3];
    dp[0] = dp[1] = dp[2] = dp2[0] = dp2[1] = inf;
    dp2[2] = 0;
    for (int i = 0;i<n;i++) {
        for (int j = 0;j<=2;j++) {
            if (dp2[j] == inf) continue;
            int swi = (i && (now(i,j) != b[i-1]));
            if (!swi) {
                for (int jj = 0;jj<3;jj++) chmin(dp[jj],dp2[j]+(jj<2 && j!=jj)+(now(i+1,jj)!=b[i]));
            }
            else {
                for (int jj = 0;jj<3;jj++) chmin(dp[jj],dp2[j]+(jj<2 && j!=jj));
            }
        }
        for (int j = 0;j<3;j++) {
            dp2[j] = dp[j];
            dp[j] = inf;
        }
    }
    int ans = inf;
    for (int j = 0;j<3;j++) ans = min(ans,dp2[j]);
    putuint(ans);
    flush();
}


int32_t main() { 
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    #ifdef Dodi 
        freopen("in.txt","r",stdin);
        freopen("out.txt","w",stdout);
    #endif
    int t = 1;
    //cin >> t;
    while (t --> 0) solve();
}

• Subtask 1: 0 / 6
• Subtask 2: 0 / 41
• Subtask 3: 0 / 4
• Subtask 4: 0 / 49