Submission #863481

#	Time	Username	Problem	Language	Result	Execution time	Memory
863481		VMaksimoski008	Mutating DNA (IOI21_dna)	C++17	56 / 100	33 ms	10824 KiB

dna

#include <bits/stdc++.h>
#define sz(x) (int)x.size()
#define int long long

using namespace std;
using ll = long long;

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');
    }
}

int32_t get_distance(int32_t x, int32_t y) {
    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;

        return (prefixAT[y+1] + prefixAC[y+1] + prefixCT[y+1] - prefixAT[x] - prefixAC[x] - prefixCT[x] + 1) / 2;
    }

    return 0;
}

// int32_t main() {
//     int n, q;
//     cin >> n >> q;

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

//     init(x, y);
    
//     while(q--) {
//         int l, r;
//         cin >> l >> r;
//         cout << get_distance(l, r) << '\n';
//     }
//     return 0;
// }

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