Submission #1116322

#	Time	Username	Problem	Language	Result	Execution time	Memory
1116322		jtrh	Mutating DNA (IOI21_dna)	C++17	100 / 100	33 ms	6420 KiB

dna

#include "dna.h"
#include <vector>

std::vector<int> ca, ct, cc, aa, at, tc;

void init(std::string a, std::string b) {
	ca.resize(a.size() + 1);
	ct.resize(a.size() + 1);
	cc.resize(a.size() + 1);
	aa.resize(a.size() + 1);
	at.resize(a.size() + 1);
	tc.resize(a.size() + 1);
	for (int i = 0; i < a.size(); ++i) {
		ca[i + 1] = ca[i] + (a[i] == 'A') - (b[i] == 'A');
		ct[i + 1] = ct[i] + (a[i] == 'T') - (b[i] == 'T');
		cc[i + 1] = cc[i] + (a[i] == 'C') - (b[i] == 'C');
		aa[i + 1] = aa[i] + ((a[i] == 'A') != (b[i] == 'A'));
		at[i + 1] = at[i] + (a[i] == 'A' && b[i] == 'T') - (a[i] == 'T' && b[i] == 'A');
		tc[i + 1] = tc[i] + ((a[i] == 'T' && b[i] == 'C') || (a[i] == 'C' && b[i] == 'T'));
	}
}

int get_distance(int x, int y) {
	if (ca[x] != ca[y + 1] || ct[x] != ct[y + 1] || cc[x] != cc[y + 1]) {
		return -1;
	}
	return (aa[y + 1] - aa[x] + abs(at[y + 1] - at[x]) + tc[y + 1] - tc[x]) / 2;
}

Compilation message (stderr)

dna.cpp: In function 'void init(std::string, std::string)':
dna.cpp:13:20: 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: 22 / 22
• Subtask 3: 13 / 13
• Subtask 4: 28 / 28
• Subtask 5: 16 / 16