Submission #522999

#	Time	Username	Problem	Language	Result	Execution time	Memory
522999		marat0210	Mutating DNA (IOI21_dna)	C++17	0 / 100	37 ms	11484 KiB

dna

#include <dna.h>
#include <bits/stdc++.h>

using namespace std;

vector <int> posa, posb;

const int N = 500500;

vector <int> prefa(N), preft(N), prefc(N);

int values[2][3][N];

void init(string a, string b)
{
    int n = a.size();
    for (int i = 0; i < n; ++i) {
        if (a[i] == 'A') {
            posa.push_back(0);
        }
        else if (a[i] == 'T') {
            posa.push_back(1);
        }
        else if (a[i] == 'C') {
            posa.push_back(2);
        }
        if (b[i] == 'A') {
            posb.push_back(0);
        }
        else if (b[i] == 'T') {
            posb.push_back(1);
        }
        else if (b[i] == 'C') {
            posb.push_back(2);
        }
    }
    int va = 0, vt = 0, vc = 0;
    for (int i = 0; i < n; ++i) {
        if ((posa[i] == 0 and posb[i] != 0) or (posb[i] == 0 and posa[i] != 0)) {
            va++;
            prefa[i] = va;
        }
        else if (posa[i] != 0 or posb[i] != 0) {
            if (i > 0) {
                prefa[i] = prefa[i - 1];
            }
        }
        if ((posa[i] == 1 and posb[i] != 1) or (posa[i] != 1 and posb[i] == 1)) {
            vt++;
            preft[i] = vt;
        }
        else if (posa[i] != 1 or posb[i] != 1) {
            if (i > 0) {
                preft[i] = preft[i - 1];
            }
        }
        if ((posa[i] == 2 and posb[i] != 2) or (posa[i] != 2 and posb[i] == 2)) {
            vc++;
            prefc[i] = vc;
        }
        else if (posa[i] != 2 or posb[i] != 2) {
            if (i > 0) {
                prefc[i] = prefc[i - 1];
            }
        }
    }
    int cnta = 0, cntt = 0, cntc = 0;
    for (int i = 0; i < n; ++i) {
        if (posa[i] == 0) {
            cnta++;
            values[0][0][i] = cnta;
            if (i > 0) {
                values[0][1][i] = values[0][1][i - 1];
                values[0][2][i] = values[0][2][i - 1];
            }
        }
        else if (posa[i] == 1) {
            cntt++;
            values[0][1][i] = cntt;
            if (i > 0) {
                values[0][0][i] = values[0][0][i - 1];
                values[0][2][i] = values[0][2][i - 1];
            }
        }
        else if (posa[i] == 2) {
            cntc++;
            values[0][2][i] = cntc;
            if (i > 0) {
                values[0][0][i] = values[0][0][i - 1];
                values[0][1][i] = values[0][1][i - 1];
            }
        }
    }
    cnta = 0, cntt = 0, cntc = 0;
    for (int i = 0; i < n; ++i) {
        if (posb[i] == 0) {
            cnta++;
            values[1][0][i] = cnta;
            if (i > 0) {
                values[1][1][i] = values[1][1][i - 1];
                values[1][2][i] = values[1][2][i - 1];
            }
        }
        else if (posb[i] == 1) {
            cntt++;
            values[1][1][i] = cntt;
            if (i > 0) {
                values[1][0][i] = values[1][0][i - 1];
                values[1][2][i] = values[1][2][i - 1];
            }
        }
        else if (posb[i] == 2) {
            cntc++;
            values[1][2][i] = cntc;
            if (i > 0) {
                values[1][0][i] = values[1][0][i - 1];
                values[1][1][i] = values[1][1][i - 1];
            }
        }
    }
}

int get_distance(int x, int y)
{
    if (y - x == 0) {
        if (posa[x] == posb[x]) {
            return 0;
        }
        else {
            return -1;
        }
    }
    else {
        int cnta = 0, cntt = 0, cntc = 0;
        bool ok = false;
        if (x == 0) {
            cnta = values[0][0][y] - values[1][0][y];
            cntt = values[0][1][y] - values[1][1][y];
            cntc = values[0][2][y] - values[1][2][y];
        }
        else {
            cnta = values[0][0][y] - values[0][0][x - 1] - values[1][0][y] + values[1][0][x - 1];
            cntt = values[0][1][y] - values[0][1][x - 1] - values[1][1][y] + values[1][1][x - 1];
            cntc = values[0][2][y] - values[0][2][x - 1] - values[1][2][y] + values[1][2][x - 1];
        }
        if (cntc > 0) {
            ok = true;
        }
        if (cnta != 0 or cntt != 0 or cntc != 0) {
            return -1;
        }
        if (!ok) {
            int res = 0;
            if (x == 0) {
                res = prefa[y] / 2;
            }
            else {
                res = (prefa[y] - prefa[x - 1]) / 2;
            }
            return res;
        }
    }
}

Compilation message (stderr)

dna.cpp: In function 'int get_distance(int, int)':
dna.cpp:163:1: warning: control reaches end of non-void function [-Wreturn-type]
  163 | }
      | ^

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