Submission #443804

#	Time	Username	Problem	Language	Result	Execution time	Memory
443804		fuad27	Mutating DNA (IOI21_dna)	C++17	0 / 100	39 ms	4980 KiB

dna

#include "dna.h"
#include<bits/stdc++.h>
using namespace std;
string a, b;
vector<int> prefix;
vector<int> prefA;
vector<int> prefB;
void init(string A, string B) {
	a = A;
	b = B;
	prefix.resize(A.length()+1, 0);
	prefA.resize(A.length() +1, 0);
	prefB.resize(A.length() +1, 0);
	for(int i = 0;i<A.length();i++) {
		if(A[i] != B[i]) {
			prefix[i+1] = prefix[i] + 1;
		}
		else {
			prefix[i+1] = prefix[i];
		}
		if(A[i] == A[0]) {
			prefA[i+1] = prefA[i] + 1;
		}
		else {
			prefA[i+1] - prefA[i] - 1;
		}
		if(B[i] == A[0]) {
			prefB[i+1] = prefB[i] + 1;
		}
		else {
			prefB[i+1] = prefB[i] - 1;
		}
	}
}
int get_distance(int x, int y) {
	if(prefA[y+1] - prefA[x] != prefB[y+1] - prefB[x]) {
		return -1;
	}
	return (prefix[y+1] - prefix[x])/2;
}

Compilation message (stderr)

dna.cpp: In function 'void init(std::string, std::string)':
dna.cpp:14:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |  for(int i = 0;i<A.length();i++) {
      |                ~^~~~~~~~~~~
dna.cpp:25:26: warning: value computed is not used [-Wunused-value]
   25 |    prefA[i+1] - prefA[i] - 1;

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