Submission #811163

#	Time	Username	Problem	Language	Result	Execution time	Memory
811163		math_rabbit_1028	Mutating DNA (IOI21_dna)	C++17	100 / 100	30 ms	6280 KiB

dna

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

int cnt[101010][3], dif[101010][6];
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][0] = dif[i][0];
		dif[i + 1][1] = dif[i][1];
		dif[i + 1][2] = dif[i][2];
		dif[i + 1][3] = dif[i][3];
		dif[i + 1][4] = dif[i][4];
		dif[i + 1][5] = dif[i][5];
		if (a[i] == 'A' && b[i] == 'C') dif[i + 1][0]++;
		if (a[i] == 'A' && b[i] == 'T') dif[i + 1][1]++;
		if (a[i] == 'C' && b[i] == 'A') dif[i + 1][2]++;
		if (a[i] == 'C' && b[i] == 'T') dif[i + 1][3]++;
		if (a[i] == 'T' && b[i] == 'A') dif[i + 1][4]++;
		if (a[i] == 'T' && b[i] == 'C') dif[i + 1][5]++;
	}
}

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;
	int ans = 0;
	ans += min(dif[y + 1][0] - dif[x][0], dif[y + 1][2] - dif[x][2]);
	ans += min(dif[y + 1][1] - dif[x][1], dif[y + 1][4] - dif[x][4]);
	ans += min(dif[y + 1][3] - dif[x][3], dif[y + 1][5] - dif[x][5]);
	ans += 2 * abs(dif[y + 1][0] - dif[x][0] - dif[y + 1][2] + dif[x][2]);
	return ans;
}

Compilation message (stderr)

dna.cpp: In function 'void init(std::string, std::string)':
dna.cpp:7:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    7 |  for (int i = 0; i < a.length(); i++) {
      |                  ~~^~~~~~~~~~~~

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