Submission #1067371

#	Time	Username	Problem	Language	Result	Execution time	Memory
1067371		AlgorithmWarrior	Mutating DNA (IOI21_dna)	C++17	100 / 100	29 ms	9824 KiB

dna

#include "dna.h"
#include <bits/stdc++.h>
#define MAX 100005

using namespace std;

int sp[MAX][3][3];
int sp1[MAX][3];
int sp2[MAX][3];

void init(string a, string b)
{
    int to[100];
    to['A']=0;
    to['C']=1;
    to['T']=2;
    int n=a.size();
    int i,j,k;
    for(i=1;i<=n;++i)
    {
        ++sp[i][to[a[i-1]]][to[b[i-1]]];
        ++sp1[i][to[a[i-1]]];
        ++sp2[i][to[b[i-1]]];
        for(j=0;j<3;++j)
            sp1[i][j]+=sp1[i-1][j];
        for(j=0;j<3;++j)
            sp2[i][j]+=sp2[i-1][j];
        for(j=0;j<3;++j)
            for(k=0;k<3;++k)
                sp[i][j][k]+=sp[i-1][j][k];
    }
}

int get_distance(int x, int y)
{
    ++x,++y;
    int i,j;
    for(i=0;i<3;++i)
        if(sp1[y][i]-sp1[x-1][i]!=sp2[y][i]-sp2[x-1][i])
            return -1;
    int nr=abs(sp[y][0][1]-sp[x-1][0][1]-sp[y][1][0]+sp[x-1][1][0]);
    int cnt=2*nr;
    for(i=0;i<3;++i)
        for(j=i+1;j<3;++j)
            cnt+=min(sp[y][i][j]-sp[x-1][i][j],sp[y][j][i]-sp[x-1][j][i]);
    return cnt;
}

Compilation message (stderr)

dna.cpp: In function 'void init(std::string, std::string)':
dna.cpp:21:26: warning: array subscript has type 'char' [-Wchar-subscripts]
   21 |         ++sp[i][to[a[i-1]]][to[b[i-1]]];
      |                          ^
dna.cpp:21:38: warning: array subscript has type 'char' [-Wchar-subscripts]
   21 |         ++sp[i][to[a[i-1]]][to[b[i-1]]];
      |                                      ^
dna.cpp:22:27: warning: array subscript has type 'char' [-Wchar-subscripts]
   22 |         ++sp1[i][to[a[i-1]]];
      |                           ^
dna.cpp:23:27: warning: array subscript has type 'char' [-Wchar-subscripts]
   23 |         ++sp2[i][to[b[i-1]]];
      |                           ^

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