Submission #1053235

#	Time	Username	Problem	Language	Result	Execution time	Memory
1053235		Zicrus	Mutating DNA (IOI21_dna)	C++17	35 / 100	28 ms	5232 KiB

dna

#include <bits/stdc++.h>
#include "dna.h"
using namespace std;

typedef long long ll;

string a, b;
vector<ll> sum, sumA, sumB;

void init(string a1, string b1) {
    a = a1; b = b1;
    sum = vector<ll>(a.size()+1);
    for (int i = 1; i <= a.size(); i++) {
        sum[i] = sum[i-1] + (a[i-1] != b[i-1]);
    }
    sumA = vector<ll>(a.size()+1);
    for (int i = 1; i <= a.size(); i++) {
        sumA[i] = sumA[i-1] + (a[i-1] == 'A');
    }
    sumB = vector<ll>(a.size()+1);
    for (int i = 1; i <= a.size(); i++) {
        sumB[i] = sumB[i-1] + (b[i-1] == 'A');
    }
}

int get_distance(int x, int y) {
    if (sumA[y+1] - sumA[x] != sumB[y+1] - sumB[x]) return -1;
    ll cnt = sum[y+1] - sum[x];
    return cnt / 2;
}

Compilation message (stderr)

dna.cpp: In function 'void init(std::string, std::string)':
dna.cpp:13:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   13 |     for (int i = 1; i <= a.size(); i++) {
      |                     ~~^~~~~~~~~~~
dna.cpp:17:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |     for (int i = 1; i <= a.size(); i++) {
      |                     ~~^~~~~~~~~~~
dna.cpp:21:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |     for (int i = 1; i <= a.size(); i++) {
      |                     ~~^~~~~~~~~~~

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