Submission #437649

#	Time	Username	Problem	Language	Result	Execution time	Memory
437649		Pajaraja	Mutating DNA (IOI21_dna)	C++17	100 / 100	55 ms	9764 KiB

dna

#include "dna.h"
#include <bits/stdc++.h>
#define MAXN 100007
using namespace std;
int p[9][MAXN],pa[3][MAXN],pb[3][MAXN];

void init(std::string a, std::string b) {
    for(int i=0;i<a.size();i++) if(a[i]=='T') a[i]='B';
    for(int i=0;i<a.size();i++) if(b[i]=='T') b[i]='B';
    for(int i=0;i<a.size();i++)
    {
        for(int j=0;j<9;j++) p[j][i+1]=p[j][i];
        for(int j=0;j<3;j++) {pa[j][i+1]=pa[j][i]; pb[j][i+1]=pb[j][i];}
        p[(a[i]-'A')*3+(b[i]-'A')][i+1]++;
        pa[a[i]-'A'][i+1]++;
        pb[b[i]-'A'][i+1]++;
    }
}

int get_distance(int x, int y) {
	int ab=p[1][y+1]-p[1][x],ac=p[2][y+1]-p[2][x],ba=p[3][y+1]-p[3][x],bc=p[5][y+1]-p[5][x],ca=p[6][y+1]-p[6][x],cb=p[7][y+1]-p[7][x];
	for(int i=0;i<3;i++) if(pa[i][y+1]-pa[i][x]!=pb[i][y+1]-pb[i][x]) return -1;
	return min(ab,ba)+min(bc,cb)+min(ca,ac)+((abs(ab-ba)+abs(bc-cb)+abs(ac-ca))*2)/3;
}

Compilation message (stderr)

dna.cpp: In function 'void init(std::string, std::string)':
dna.cpp:8:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    8 |     for(int i=0;i<a.size();i++) if(a[i]=='T') a[i]='B';
      |                 ~^~~~~~~~~
dna.cpp:9:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    9 |     for(int i=0;i<a.size();i++) if(b[i]=='T') b[i]='B';
      |                 ~^~~~~~~~~
dna.cpp:10:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |     for(int i=0;i<a.size();i++)
      |                 ~^~~~~~~~~

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