Submission #807722

#	Time	Username	Problem	Language	Result	Execution time	Memory
807722		vjudge1	Mutating DNA (IOI21_dna)	C++17	100 / 100	32 ms	7400 KiB

dna

#include "dna.h"
using namespace std;
int dp[100100][3][3];
void init(string a, string b) {
    string key = "ACT";
    for(int i = 1; i <= a.size(); i++)
        for(int j = 0; j < 3; j++)
            for(int k = 0; k < 3; k++)
                dp[i][j][k]=dp[i-1][j][k]+(a[i-1]==key[j]&&b[i-1]==key[k]);
}

int get_distance(int l, int r) {
	int ans=0,prev=0;
    for(int i = 0; i < 3; i++) {
        int next = (i+1)%3;
        int x = dp[r+1][i][next]-dp[l][i][next],y=dp[r+1][next][i]-dp[l][next][i];
        if(i){
            if(prev!=x-y) return -1;
        } else
            ans+=2*abs(prev=x-y);
        ans+=min(x,y);
    }
    return ans;
}

Compilation message (stderr)

dna.cpp: In function 'void init(std::string, std::string)':
dna.cpp:6:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    6 |     for(int 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