Submission #1117979

#	Time	Username	Problem	Language	Result	Execution time	Memory
1117979		JanPham	Mutating DNA (IOI21_dna)	C++17	0 / 100	23 ms	2728 KiB

dna

#include <bits/stdc++.h>
 
using namespace std;
 
#define pb push_back
#define fi first
#define se second
#define TranLeThanhTam "TranLeThanhTam"
#define all(v) v.begin(),v.end()
#define reset(a,i) memset(a,i,sizeof(a))
#define FOR(i,a,b) for (int i = (a), _b = (b); i <= _b; ++i)
#define FORD(i,a,b) for (int i = (a), _b = (b); i >= _b; --i)
#define compact(v) sort(all(v)), v.erase(unique(all(v)), end(v))
#define sz(v) (int) v.size()
#define MASK(i) (1LL << (i)
#define BIT(i,x) ((x & MASK(i)) >> (i))

typedef long long ll;
typedef long double lb;
typedef pair<ll,ll> pll;
typedef pair<int,int> pii;
 
const int Thanh_Tam = 1e5 + 17;
const int inf = 1e9 + 17;
const long long infll = 1e18 + 17;
const int MOD = 1e9 + 7;
const int Log = 18;
const int dx[4] = {-1, 0, 1, 0};
const int dy[4] = {0, 1, 0, -1};
const int max_block_size = 270;
const ll P = 311;
const int maxA = 1e2 + 17;
const int addi = 1e9;
const char dir[4] = {'W', 'S', 'N', 'E'};
const int Mod[3] = {998244353, MOD, 759186269};
 
ll mul(ll a, ll b, ll mod);
ll binpow(ll a, ll b, ll mod)
{
    ll res = 1;
    while (b > 0)
    {
        if (b & 1) res = mul(res,a,mod);
        b >>= 1;
        a = mul(a,a,mod);
    }
    return res;
}
ll add(ll a, ll b, ll mod) { return (a + b) % mod;                 }
ll sub(ll a, ll b, ll mod) { return (a - b + mod) % mod;          }
ll mul(ll a, ll b, ll mod) { return ((a % mod) * (b % mod)) % mod; }
ll div(ll a, ll b, ll mod) { return mul(a, binpow(b, mod - 2, mod), mod); }
 
mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
ll rand_range(ll l, ll r) { return uniform_int_distribution<ll>(l,r)(rng); }

struct iii
{
    int x,y,z;
};

int n,q;
string a,b;
int pref_valid[Thanh_Tam][3][2], pref[Thanh_Tam][6];
iii per[2] = {{0, 4, 3}, {2, 5, 1}}; 

void init(string a, string b)
{
    a = '.' + a;
    b = '.' + b;
    
    //Preparation
    FOR(i,1,n) 
    {
        if (a[i] == 'T') a[i] = 'B';
        if (b[i] == 'T') b[i] = 'B';
    }
    
    FOR(i,1,n)
        FOR(j,0,2)
        {
            pref_valid[i][j][0] = pref_valid[i - 1][j][0] + (a[i] == char ('A' + j));
            pref_valid[i][j][1] = pref_valid[i - 1][j][1] + (b[i] == char ('A' + j));
        }

    FOR(i,1,n)
    {
        pref[i][0] = pref[i - 1][0] + (a[i] == 'A' && b[i] == 'B');
        pref[i][1] = pref[i - 1][1] + (a[i] == 'B' && b[i] == 'A');
        pref[i][2] = pref[i - 1][2] + (a[i] == 'A' && b[i] == 'C');
        pref[i][3] = pref[i - 1][3] + (a[i] == 'C' && b[i] == 'A');
        pref[i][4] = pref[i - 1][4] + (a[i] == 'B' && b[i] == 'C');
        pref[i][5] = pref[i - 1][5] + (a[i] == 'C' && b[i] == 'B');
    }

}

bool Valid(int x, int y)
{
    int A[3], B[3];

    FOR(j,0,2) 
    {
        A[j] = pref_valid[y][j][0] - pref_valid[x - 1][j][0];
        B[j] = pref_valid[y][j][1] - pref_valid[x - 1][j][1];
    }
    return (A[0] == B[0] && A[1] == B[1] && A[2] == B[2]);
}

int get_distance(int x, int y)
{
    ++x, ++y;
    if (!Valid(x,y)) return -1;

    int val[6];
    FOR(i,0,5) val[i] = pref[y][i] - pref[x - 1][i];

    int ans = 0;
    FOR(i,0,2)
    {
        int tmp = min(val[i * 2], val[i * 2 + 1]);
        val[i * 2] -= tmp;
        val[i * 2 + 1] -= tmp;
        ans += tmp;
    }

    int rem = 0;
    FOR(i,0,1)
    {
        int tmp = min({val[per[i].x], val[per[i].y], val[per[i].z]});
        val[per[i].x] -= tmp;
        val[per[i].y] -= tmp;
        val[per[i].z] -= tmp;
        ans += (tmp << 1);
    }

    return ans;
}

/*int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
 
    if (fopen(TranLeThanhTam".inp","r"))
    {
        freopen(TranLeThanhTam".inp","r",stdin);
        freopen(TranLeThanhTam".out","w",stdout);
    }
 
    cin >> n >> q >> a >> b;
    init(a,b);
    //Processing
    while (q--)
    {
        int l,r;
        cin >> l >> r;
        cout << get_distance(l,r) << '\n';
    }
    return 0;
}
*/

Compilation message (stderr)

dna.cpp: In function 'int get_distance(int, int)':
dna.cpp:127:9: warning: unused variable 'rem' [-Wunused-variable]
  127 |     int rem = 0;
      |         ^~~

• Subtask 1: 0 / 21
• Subtask 2: 0 / 22
• Subtask 3: 0 / 13
• Subtask 4: 0 / 28
• Subtask 5: 0 / 16