Submission #719510

#	Time	Username	Problem	Language	Result	Execution time	Memory
719510		baojiaopisu	Mutating DNA (IOI21_dna)	C++17	100 / 100	45 ms	16416 KiB

dna

#include<bits/stdc++.h>

using namespace std;

using ll = long long;
using ld = long double;
using ull = unsigned long long;

using pii = pair<int, int>;
using pll = pair<ll, ll>;
using pld = pair<ld, ld>;

#define fi first
#define se second
#define left BAO
#define right ANH
#define pb push_back
#define pf push_front
#define mp make_pair
#define ins insert
#define btpc __builtin_popcount
#define btclz __builtin_clz

#define sz(x) (int)(x.size());
#define all(x) x.begin(), x.end()
#define debug(...) " [" << #__VA_ARGS__ ": " << (__VA_ARGS__) << "] "

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

int d4x[4] = {1, 0, -1, 0}; int d4y[4] = {0, 1, 0, -1};
int d8x[8] = {0, 1, 1, 1, 0, -1, -1, -1};
int d8y[8] = {1, 1, 0, -1, -1, -1, 0, 1};

template<class X, class Y>
    bool minimize(X &x, const Y &y) {
        if (x > y)
        {
            x = y;
            return true;
        }
        return false;
    }
template<class X, class Y>
    bool maximize(X &x, const Y &y) {
        if (x < y)
        {
            x = y;
            return true;
        }
        return false;
    }

const int MOD = 1e9 + 7; //998244353

template<class X, class Y>
	void add(X &x, const Y &y) {
		x = (x + y);
		if(x >= MOD) x -= MOD;
	}

template<class X, class Y> 
	void sub(X &x, const Y &y) {
		x = (x - y);
		if(x < 0) x += MOD;
	}

/* Author : Le Ngoc Bao Anh, 12A5, LQD High School for Gifted Student*/

const ll INF = 1e9;
const int N = 1e5 + 10;

int d[N][5][5], f[5][5];
int a[N], b[N], pref[N][5];

void init(string A, string B) {
	int n = A.size();
	A = "#" + A;
	B = "#" + B;
	for(int i = 1; i <= n; i++) {
		if(A[i] == 'A') a[i] = 0;
		if(A[i] == 'T') a[i] = 1;
		if(A[i] == 'C') a[i] = 2;

		if(B[i] == 'A') b[i] = 0;
		if(B[i] == 'T') b[i] = 1;
		if(B[i] == 'C') b[i] = 2;

		for(int j = 0; j < 3; j++) {
			pref[i][j] = pref[i - 1][j] + (a[i] == j) - (b[i] == j);
		}

		for(int j = 0; j < 3; j++) {
			for(int k = 0; k < 3; k++) {
				d[i][j][k] = d[i - 1][j][k];
			}
		}
		d[i][a[i]][b[i]]++;
	}
}

int get_distance(int l, int r) {
	l++; r++;
	for(int i = 0; i < 3; i++) {
		if(pref[r][i] != pref[l - 1][i]) return -1;
	}

	int ans = 0;
	for(int i = 0; i < 3; i++) {
		for(int j = 0; j < 3; j++) {
			f[i][j] = d[r][i][j] - d[l - 1][i][j];
		}
	} 

	for(int i = 0; i < 3; i++) {
		for(int j = i + 1; j < 3; j++) {
			int x = min(f[i][j], f[j][i]);
			ans += x;
			f[i][j] -= x;
			f[j][i] -= x;
		}
	}

	int p = 0;
	for(int i = 0; i < 3; i++) {
		for(int j = i + 1; j < 3; j++) {
			if(f[i][j]) p = f[i][j];
		}
	}

	ans += 2 * p;
	return ans;
}

• Subtask 1: 21 / 21
• Subtask 2: 22 / 22
• Subtask 3: 13 / 13
• Subtask 4: 28 / 28
• Subtask 5: 16 / 16