Submission #483596

#	Time	Username	Problem	Language	Result	Execution time	Memory
483596		ponytail	Mutating DNA (IOI21_dna)	C++17	21 / 100	37 ms	4488 KiB

dna

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

void init(std::string a, std::string b);
int get_distance(int x, int y);


int ps[6][100000];
void init(std::string a, std::string b) {
    string patt[6] = {"CA", "AC", "TA", "AT", "CT", "TC"};
    for(int i=0; i<a.size(); i++) {
        for(int j=0; j<6; j++) {
            string now;
            now += a[i];
            now += b[i];
            ps[j][i] = (i==0 ? 0 : ps[j][i-1]) + (now == patt[j]);
        }
    }
}

int get_distance(int x, int y) {
    int res[6];
    for(int i=0; i<6; i++) res[i] = ps[i][y] - (x==0 ? 0 : ps[i][x-1]);
    if(res[0] + res[4] != res[1] + res[5]) return -1;
    if(res[1] + res[3] != res[0] + res[2]) return -1;
    if(res[2] + res[5] != res[3] + res[4]) return -1;
    int ans = min(res[0], res[1]) + min(res[2], res[3]) + min(res[4], res[5]);
    res[0] -= min(res[0], res[1]);
    res[1] -= min(res[0], res[1]);
    res[2] -= min(res[2], res[3]);
    res[3] -= min(res[2], res[3]);
    res[4] -= min(res[4], res[5]);
    res[5] -= min(res[4], res[5]);
    int sum = 0;
    for(int i=0; i<6; i++) sum += res[i];
    ans += max(0, sum - 1);
	return ans;
}

Compilation message (stderr)

dna.cpp: In function 'void init(std::string, std::string)':
dna.cpp:13:19: 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=0; i<a.size(); i++) {
      |                  ~^~~~~~~~~

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