Submission #820021

#	Time	Username	Problem	Language	Result	Execution time	Memory
820021		amunduzbaev	Mutating DNA (IOI21_dna)	C++17	35 / 100	33 ms	6604 KiB

dna

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

#define ar array 
typedef long long ll;
//~ #define int ll

const int N = 1e5 + 5;
int is[N], pref[N];
ar<int, 3> c[2][N];

void init(string a, string b) {
	//~ cout<<"here"<<endl;
	int n = a.size();
	for(int i=1;i<=n;i++){
		pref[i] = pref[i - 1] + (a[i - 1] != b[i - 1]);
		c[0][i] = c[0][i - 1], c[1][i] = c[1][i - 1];
		{
			int v;
			if(a[i - 1] == 'A') v = 0;
			if(a[i - 1] == 'C') v = 1;
			if(a[i - 1] == 'T') v = 2;
			c[0][i][v]++;
		}
		{
			int v;
			if(b[i - 1] == 'A') v = 0;
			if(b[i - 1] == 'C') v = 1;
			if(b[i - 1] == 'T') v = 2;
			c[1][i][v]++;
		}
	}
	
}

ar<int, 3> get(int t, int x, int y){
	ar<int, 3> ans {};
	ans[0] = c[t][y][0] - c[t][x][0];
	ans[1] = c[t][y][1] - c[t][x][1];
	ans[2] = c[t][y][2] - c[t][x][2];
	//~ cout<<ans[0]<<" "<<ans[1]<<" "<<ans[2]<<"\n";
	return ans;
}

int get_distance(int x, int y) {
	x++, y++;
	
	if(get(0, x - 1, y) == get(1, x - 1, y)){
		return (pref[y] - pref[x - 1]) / 2;
	} else {
		return -1;
	}
}

Compilation message (stderr)

dna.cpp: In function 'void init(std::string, std::string)':
dna.cpp:31:13: warning: 'v' may be used uninitialized in this function [-Wmaybe-uninitialized]
   31 |    c[1][i][v]++;
      |             ^
dna.cpp:24:13: warning: 'v' may be used uninitialized in this function [-Wmaybe-uninitialized]
   24 |    c[0][i][v]++;
      |             ^

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