Submission #866163

#	Time	Username	Problem	Language	Result	Execution time	Memory
866163		lomta	Mutating DNA (IOI21_dna)	C++17	0 / 100	28 ms	4468 KiB

dna

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

const int N = 1e5 + 5;
int pref1[N],pref2[N],pref3[N];





void init(std::string a, std::string b) {
	
	pref1[0]=0;
	for(int i=0;i<a.size();i++){
		pref1[i+1]=pref1[i];
		if(a[i]=='A' && b[i]=='T'){
			pref1[i+1]++;
		}
		if(a[i]=='T' && b[i]=='A'){
			pref1[i+1]--;
		}
	}
	
	pref2[0]=0;
	for(int i=0;i<a.size();i++){
		pref2[i+1]=pref2[i];
		if(a[i]=='T' && b[i]=='C'){
			pref2[i+1]++;
		}
		if(a[i]=='C' && b[i]=='T'){
			pref2[i+1]--;
		}
	}
	pref3[0]=0;
	for(int i=0;i<a.size();i++){
		pref3[i+1]=pref3[i];
		if(a[i]=='C' && b[i]=='A'){
			pref3[i+1]++;
		}
		if(a[i]=='A' && b[i]=='C'){
			pref3[i+1]--;
		}
	}
}

int get_distance(int x, int y) {
	x++;
	y++;
	x--;
	int a1=pref1[y]-pref1[x];
	int b1=pref2[y]-pref2[x];
	int c1=pref3[y]-pref3[x];
	
	if(a1!=b1 || b1!=c1 || c1!=a1){
		return -1;
	}
	int sz=y-x;
	return (sz-abs(a1)-abs(b1)-abs(c1))/2+(abs(a1)+abs(b1)+abs(c1))/3*2;
}

Compilation message (stderr)

dna.cpp: In function 'void init(std::string, std::string)':
dna.cpp:15:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   15 |  for(int i=0;i<a.size();i++){
      |              ~^~~~~~~~~
dna.cpp:26:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |  for(int i=0;i<a.size();i++){
      |              ~^~~~~~~~~
dna.cpp:36:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |  for(int i=0;i<a.size();i++){
      |              ~^~~~~~~~~

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