제출 #222542

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
222542		_7_7_	Lamps (JOI19_lamps)	C++14	4 / 100	28 ms	14080 KiB

lamp

#include <bits/stdc++.h>        	                                   
 
//#define int long long
//#pragma GCC optimize("Ofast")
//#pragma comment(linker, "/stack:200000000")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4")
 
 
#define file(s) freopen(s".in","r",stdin); freopen(s".out","w",stdout);
#define forev(i, b, a) for(int i = (b); i >= (a); --i)
#define forn(i, a, b) for(int i = (a); i <= (b); ++i)
#define all(x) x.begin(), x.end()
#define sz(s) (int)s.size()
#define pb push_back
#define ppb pop_back
#define mp make_pair
#define s second
#define f first
 
 
using namespace std;
 
 
typedef pair < long long, long long > pll;    
typedef pair < int, int > pii;
typedef unsigned long long ull;         
typedef vector < pii > vpii;
typedef vector < int > vi;
typedef long double ldb;  
typedef long long ll;  
typedef double db;                             
 
 
const int inf = 1e9, maxn = 4e5 + 148, mod = 1e9 + 7, N = 1e6 + 11;
const int dx[] = {1, -1, 0, 0}, dy[] = {0, 0, 1, -1}, block = 333;
const pii base = mp(1171, 3307), Mod = mp(1e9 + 7, 1e9 + 9);
const db eps = 1e-12, pi = 3.14159265359;
const ll INF = 1e18;
 
 
int n, dp[N][2], prv[N], a[N], b[N], c[N];
char s[N], t[N];

int solve1 () {
	for (int i = 1; i <= n; ++i) {
		prv[i] = i - 1;
		if (i > 1 && t[i] == t[i - 1])
			prv[i] = prv[i - 1];
	}	
		
 
	dp[0][1] = inf;
	int lst = 0, lst1 = 0;
	for (int i = 1; i <= n; ++i)
		if (s[i] == t[i]) {
			dp[i][0] = min({dp[i - 1][0], dp[i - 1][1], dp[prv[i]][0] + 1, dp[prv[i]][1] + 1});
			dp[i][1] = min({dp[lst1][0] + 2, dp[lst1][1] + 1, dp[prv[i]][0] + 2, dp[prv[i]][1] + 1});
			lst = i;
		} else {
			dp[i][0] = min(dp[prv[i]][0], dp[prv[i]][1]) + 1;
			dp[i][1] = min(dp[lst][0] + 1, dp[lst][1]);
			lst1 = i;
		}

/*	for (int i = 1; i <= n; ++i)
		cout << dp[i][0] << ' ' << dp[i][1] << endl;*/

	return min(dp[n][0], dp[n][1]);		
}
 
main () {
	scanf("%d\n%s\n%s", &n, s + 1, t + 1);
//	int x1 = solve1(), x2 = solve2();
//	cerr << x1 << ' ' << x2 << endl;
	cout << solve1() << endl;
}
 

컴파일 시 표준 에러 (stderr) 메시지

lamp.cpp:71:7: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main () {
       ^
lamp.cpp: In function 'int main()':
lamp.cpp:72:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d\n%s\n%s", &n, s + 1, t + 1);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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