Submission #811154

#	Time	Username	Problem	Language	Result	Execution time	Memory
811154		math_rabbit_1028	Mutating DNA (IOI21_dna)	C++17	35 / 100	25 ms	4112 KiB

dna

#include "dna.h"

int cnt[101010][3], dif[101010];
void init(std::string a, std::string b) {
	for (int i = 0; i < a.length(); i++) {
		cnt[i + 1][0] = cnt[i][0];
		cnt[i + 1][1] = cnt[i][1];
		cnt[i + 1][2] = cnt[i][2];
		if (a[i] == 'A') cnt[i + 1][0]++;
		if (a[i] == 'C') cnt[i + 1][1]++;
		if (a[i] == 'T') cnt[i + 1][2]++;
		if (b[i] == 'A') cnt[i + 1][0]--;
		if (b[i] == 'C') cnt[i + 1][1]--;
		if (b[i] == 'T') cnt[i + 1][2]--;
		dif[i + 1] = dif[i];
		if (a[i] != b[i]) dif[i + 1]++;
	}
}

int get_distance(int x, int y) {
	if (cnt[x][0] != cnt[y + 1][0]) return -1;
	if (cnt[x][1] != cnt[y + 1][1]) return -1; 
	if (cnt[x][2] != cnt[y + 1][2]) return -1;
	return (dif[y + 1] - dif[x])/2;
}

Compilation message (stderr)

dna.cpp: In function 'void init(std::string, std::string)':
dna.cpp:5:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    5 |  for (int i = 0; i < a.length(); i++) {
      |                  ~~^~~~~~~~~~~~

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