This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#include "dna.h"
using namespace std;
vector<vector<map<char,int>>> pre1;
vector<map<string,int>> pre2;
const vector<pair<string,string>> a = {{"AT","TA"},{"CT","TC"},{"CA","AC"}};
void init(string a, string b){
pre1.assign(a.size() + 1,vector<map<char,int>>(2));
pre2.resize(a.size() + 1);
for(int i = 0; i < a.size(); i++){
pre1[i + 1] = pre1[i];
pre1[i + 1][0][a[i]]++;
pre1[i + 1][1][b[i]]++;
pre2[i + 1] = pre2[i];
pre2[i + 1][string() + a[i] + b[i]]++;
}
}
int get_distance(int x, int y){
if(pre1[y + 1][0]['A'] - pre1[x][0]['A'] != pre1[y + 1][1]['A'] - pre1[x][1]['A']) return -1;
if(pre1[y + 1][0]['T'] - pre1[x][0]['T'] != pre1[y + 1][1]['T'] - pre1[x][1]['T']) return -1;
int ans = 0, dif = 0;
for(auto [s1,s2]: a){
int r1 = pre2[y + 1][s1] - pre2[x][s1];
int r2 = pre2[y + 1][s2] - pre2[x][s2];
dif += r1 + r2 - min(r1,r2) * 2;
ans += min(r1,r2);
}
assert(dif % 3 == 0);
return ans + dif / 3 * 2;
}
Compilation message (stderr)
dna.cpp: In function 'void init(std::string, std::string)':
dna.cpp:11:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
11 | for(int i = 0; i < a.size(); i++){
| ~~^~~~~~~~~~
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