Submission #585372

#	Time	Username	Problem	Language	Result	Execution time	Memory
585372		krit3379	Mutating DNA (IOI21_dna)	C++17	100 / 100	45 ms	9708 KiB

dna

#include<bits/stdc++.h>
using namespace std;
#define N 100005
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")

int cnt[2][3][N],dp[9][N];
map<char,int> mp;

void init(string a, string b){
    int i,j;
    mp['A']=0;
    mp['C']=1;
    mp['T']=2;
    a=' '+a;
    b=' '+b;
    for(i=1;i<a.size();i++){
        for(j=0;j<3;j++)cnt[0][j][i]=cnt[0][j][i-1];
        cnt[0][mp[a[i]]][i]++;
    }
    for(i=1;i<b.size();i++){
        for(j=0;j<3;j++)cnt[1][j][i]=cnt[1][j][i-1];
        cnt[1][mp[b[i]]][i]++;
    }
    for(i=1;i<a.size();i++){
        for(j=0;j<9;j++)dp[j][i]=dp[j][i-1];
        dp[mp[a[i]]*3+mp[b[i]]][i]++;
    }
}

int get_distance(int x,int y){
    int i,j,a,b,mi,sum=0,ans=0;
    x++,y++;
    for(i=0;i<3;i++)if(cnt[0][i][y]-cnt[0][i][x-1]!=cnt[1][i][y]-cnt[1][i][x-1])return -1;
    for(i=0;i<3;i++)for(j=i+1;j<3;j++){
        a=i*3+j;
        b=j*3+i;
        mi=min(dp[a][y]-dp[a][x-1],dp[b][y]-dp[b][x-1]);
        ans+=mi;
        sum+=dp[a][y]-dp[a][x-1]+dp[b][y]-dp[b][x-1];
    }
    return ans+(sum-2*ans)/3*2;
}

Compilation message (stderr)

dna.cpp: In function 'void init(std::string, std::string)':
dna.cpp:17:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |     for(i=1;i<a.size();i++){
      |             ~^~~~~~~~~
dna.cpp:21:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |     for(i=1;i<b.size();i++){
      |             ~^~~~~~~~~
dna.cpp:25:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |     for(i=1;i<a.size();i++){
      |             ~^~~~~~~~~

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