Submission #648568

#	Time	Username	Problem	Language	Result	Execution time	Memory
648568		ghostwriter	Lamps (JOI19_lamps)	C++14	100 / 100	157 ms	27808 KiB

lamp

#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
#include <debug.h>
#else
#define debug(...)
#endif
#define ft front
#define bk back
#define st first
#define nd second
#define ins insert
#define ers erase
#define pb push_back
#define pf push_front
#define _pb pop_back
#define _pf pop_front
#define lb lower_bound
#define ub upper_bound
#define mtp make_tuple
#define bg begin
#define ed end
#define all(x) (x).bg(), (x).ed()
#define sz(x) (int)(x).size()
typedef long long ll; typedef unsigned long long ull;
typedef double db; typedef long double ldb;
typedef pair<int, int> pi; typedef pair<ll, ll> pll;
typedef vector<int> vi; typedef vector<ll> vll; typedef vector<pi> vpi; typedef vector<pll> vpll;
typedef string str;
template<typename T> T gcd(T a, T b) { return (b == 0? a : gcd(b, a % b)); }
template<typename T> T lcm(T a, T b) { return a / gcd(a, b) * b; }
#define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
#define FOS(i, r, l) for (int (i) = (r); (i) >= (l); --(i))
#define FRN(i, n) for (int (i) = 0; (i) < (n); ++(i))
#define FSN(i, n) for (int (i) = (n) - 1; (i) >= 0; --(i))
#define EACH(i, x) for (auto &(i) : (x))
#define WHILE while
#define file "TEST"
mt19937 rd(chrono::steady_clock::now().time_since_epoch().count());
ll rand(ll l, ll r) { return uniform_int_distribution<ll>(l, r)(rd); }
/*
----------------------------------------------------------------
    END OF TEMPLATE
----------------------------------------------------------------
    Tran The Bao - ghostwriter
    Training for VOI23 gold medal
----------------------------------------------------------------
    DIT ME CHUYEN BAO LOC
----------------------------------------------------------------
*/
const int N = 1e6 + 1;
int n, d[N][3][2];
char a[N], b[N];
int opr(int i, int j, int a) {
	if (i == 0) a = 0;
	else if (i == 1) a = 1;
	if (!j) a ^= 1;
	return a;
}
signed main() {
    ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
    // freopen(file".inp", "r", stdin);
    // freopen(file".out", "w", stdout);
    cin >> n;
    FOR(i, 1, n) cin >> a[i];
    FOR(i, 1, n) cin >> b[i];
    FOR(i, 1, n)
	FOR(j, 0, 2) 
	FOR(z, 0, 1) {
		int &rs = d[i][j][z];
		rs = n;
		FOR(x, 0, 2)
		FOR(y, 0, 1) {
			if (opr(x, y, a[i] - '0') != b[i] - '0') continue;
			int cost = (x == 2? 0 : x == j? 0 : 1) + (y == 1? 0 : y == z? 0 : 1);
			rs = min(rs, d[i - 1][x][y] + cost);
		}
	}
    cout << d[n][2][1];
    return 0;
}
/*
----------------------------------------------------------------
From Benq:
    stuff you should look for
        * int overflow, array bounds
        * special cases (n=1?)
        * do smth instead of nothing and stay organized
        * WRITE STUFF DOWN
        * DON'T GET STUCK ON ONE APPROACH
----------------------------------------------------------------
*/

Compilation message (stderr)

lamp.cpp: In function 'int main()':
lamp.cpp:32:31: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
lamp.cpp:65:5: note: in expansion of macro 'FOR'
   65 |     FOR(i, 1, n) cin >> a[i];
      |     ^~~
lamp.cpp:32:31: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
lamp.cpp:66:5: note: in expansion of macro 'FOR'
   66 |     FOR(i, 1, n) cin >> b[i];
      |     ^~~
lamp.cpp:32:31: warning: unnecessary parentheses in declaration of 'i' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
lamp.cpp:67:5: note: in expansion of macro 'FOR'
   67 |     FOR(i, 1, n)
      |     ^~~
lamp.cpp:32:31: warning: unnecessary parentheses in declaration of 'j' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
lamp.cpp:68:2: note: in expansion of macro 'FOR'
   68 |  FOR(j, 0, 2)
      |  ^~~
lamp.cpp:32:31: warning: unnecessary parentheses in declaration of 'z' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
lamp.cpp:69:2: note: in expansion of macro 'FOR'
   69 |  FOR(z, 0, 1) {
      |  ^~~
lamp.cpp:32:31: warning: unnecessary parentheses in declaration of 'x' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
lamp.cpp:72:3: note: in expansion of macro 'FOR'
   72 |   FOR(x, 0, 2)
      |   ^~~
lamp.cpp:32:31: warning: unnecessary parentheses in declaration of 'y' [-Wparentheses]
   32 | #define FOR(i, l, r) for (int (i) = (l); (i) <= (r); ++(i))
      |                               ^
lamp.cpp:73:3: note: in expansion of macro 'FOR'
   73 |   FOR(y, 0, 1) {
      |   ^~~

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