Submission #1021966

#	Time	Username	Problem	Language	Result	Execution time	Memory
1021966		HappyCapybara	Mutating DNA (IOI21_dna)	C++17	100 / 100	46 ms	6448 KiB

dna

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

vector<vector<int>> ps;

void init(string a, string b){
	ps.resize(6, vector<int>(a.size()+1, 0));
	for (int i=0; i<a.size(); i++){
		for (int j=0; j<6; j++) ps[j][i+1] = ps[j][i];
		if (a[i] == 'A' && b[i] == 'T') ps[0][i+1]++;
		if (a[i] == 'A' && b[i] == 'C') ps[1][i+1]++;
		if (a[i] == 'T' && b[i] == 'A') ps[2][i+1]++;
		if (a[i] == 'T' && b[i] == 'C') ps[3][i+1]++;
		if (a[i] == 'C' && b[i] == 'A') ps[4][i+1]++;
		if (a[i] == 'C' && b[i] == 'T') ps[5][i+1]++;
	}
}

int get_distance(int x, int y) {
	vector<int> v(6);
	for (int i=0; i<6; i++) v[i] = ps[i][y+1] - ps[i][x];
	int p = min(v[0], v[2])+min(v[1], v[4])+min(v[3], v[5]);
	if (v[0]+v[1] != v[2]+v[4] || v[2]+v[3] != v[0]+v[5] || v[4]+v[5] != v[1]+v[3]) return -1;
	else return p + (v[0]+v[1]+v[2]+v[3]+v[4]+v[5]-2*p)/3 * 2;
}

Compilation message (stderr)

dna.cpp: In function 'void init(std::string, std::string)':
dna.cpp:9:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    9 |  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