Submission #863464

#	Time	Username	Problem	Language	Result	Execution time	Memory
863464		VMaksimoski008	Mutating DNA (IOI21_dna)	C++17	56 / 100	32 ms	6352 KiB

dna

#include <bits/stdc++.h>

#define pb push_back
#define eb emplace_back
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define uniq(x) x.erase(unique(all(x)), x.end())
#define rall(x) x.rbegin(), x.rend()
//#define int long long

using namespace std;

using ll = long long;
using ull = unsigned long long;
using ld = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;

const int mod = 1e9 + 7;
const int LOG = 20;
const int maxn = 1e5 + 5;
const double eps = 1e-9;

void setIO() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
}

string a, b;
int n;
bool sub3 = 1;
vector<vector<int> > prefixA, prefixT, prefixC;
vector<int> prefixAT, prefixAC, prefixCT;

void init(string x, string y) {
    a = x;
    b = y;
    n = sz(a);

    for(char &ch : a) sub3 = sub3 && (ch == 'C');
    for(char &ch : b) sub3 = sub3 && (ch == 'C');

    prefixA.resize(2, vector<int>(n+1, 0));
    prefixT.resize(2, vector<int>(n+1, 0));
    prefixC.resize(2, vector<int>(n+1, 0));
    prefixAT.resize(n+1, 0);
    prefixCT.resize(n+1, 0);
    prefixAC.resize(n+1, 0);

    for(int i=0; i<n; i++) {
        prefixAT[i+1] = prefixAT[i] + (a[i] != b[i] && ((a[i] == 'A' && b[i] == 'T') || (a[i] == 'T' && b[i] == 'A')));
        prefixCT[i+1] = prefixCT[i] + (a[i] != b[i] && ((a[i] == 'C' && b[i] == 'T') || (a[i] == 'T' && b[i] == 'C')));
        prefixAC[i+1] = prefixAC[i] + (a[i] != b[i] && ((a[i] == 'A' && b[i] == 'C') || (a[i] == 'C' && b[i] == 'A')));

        prefixA[0][i+1] = prefixA[0][i] + (a[i] == 'A');
        prefixA[1][i+1] = prefixA[1][i] + (b[i] == 'A');

        prefixT[0][i+1] = prefixT[0][i] + (a[i] == 'T');
        prefixT[1][i+1] = prefixT[1][i] + (b[i] == 'T');

        prefixC[0][i+1] = prefixC[0][i] + (a[i] == 'C');
        prefixC[1][i+1] = prefixC[1][i] + (b[i] == 'C');
    }
}

int get_distance(int x, int y) {
    if(x == y) return (a[x] == b[x] ? 0 : -1);
 
    if(y - x == 1) {
        string s1 = "";
        string s2 = "";
        for(int i=x; i<=y; i++) s1 += a[i], s2 += b[i];
        if(s1 == s2) return 0;
        sort(all(s2));
        sort(all(s1));
        if(s1 != s2) return -1;
        return 1;
    }

    if(y - x == 2) {
        string s1 = "";
        string s2 = "";
        for(int i=x; i<=y; i++) s1 += a[i], s2 += b[i];
 
        int ok = 0;
        for(int i=0; i<sz(s1); i++) ok += (s1[i] == s2[i]);
 
        sort(all(s1));
        sort(all(s2));
        if(s1 != s2) return -1;
 
        if(ok == 3) return 0;
        if(ok == 1) return 1;
        if(ok == 0) return 2;
    }

    if(y - x <= 100000) {
        if(prefixA[0][y+1] - prefixA[0][x] != prefixA[1][y+1] - prefixA[1][x]) return -1;
        if(prefixT[0][y+1] - prefixT[0][x] != prefixT[1][y+1] - prefixT[1][x]) return -1;
        if(prefixC[0][y+1] - prefixC[0][x] != prefixC[1][y+1] - prefixC[1][x]) return -1;
        
        int d1 = (prefixAT[y+1] - prefixAT[x] + 1) / 2;
        int d2 = (prefixCT[y+1] - prefixCT[x] + 1) / 2;
        int d3 = (prefixAC[y+1] - prefixAC[x] + 1) / 2;

        return d1 + d2 + d3;
    }

    return 0;
}

// int32_t main() {
//     setIO();

//     string x, y;
//     cin >> x >> y;

//     init(x, y);
//     cout << get_distance(0, 0) << '\n';
//     cout << get_distance(0, 1) << '\n';
//     cout << get_distance(0, 2) << '\n';
//     return 0;
// }

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