Submission #738600

#	Time	Username	Problem	Language	Result	Execution time	Memory
738600		Toxtaq	Mutating DNA (IOI21_dna)	C++17	43 / 100	1570 ms	6072 KiB

dna

#include<bits/stdc++.h>
using namespace std;
string a, b;
vector<int>prefA, prefT, prefC;
vector<int>pref2A, pref2T, pref2C;
void init(string s1, string s2){
    a = s1;
    b = s2;
    prefA.resize(s1.size() + 1);
    prefT.resize(s1.size() + 1);
    prefC.resize(s1.size() + 1);
    pref2A.resize(s1.size() + 1);
    pref2T.resize(s1.size() + 1);
    pref2C.resize(s1.size() + 1);
    for(int i = 0;i < s1.size();++i){
        prefA[i + 1] = prefA[i] + (s1[i] == 'A');
        prefT[i + 1] = prefT[i] + (s1[i] == 'T');
        prefC[i + 1] = prefC[i] + (s1[i] == 'C');
        pref2A[i + 1] = pref2A[i] + (s2[i] == 'A');
        pref2T[i + 1] = pref2T[i] + (s2[i] == 'T');
        pref2C[i + 1] = pref2C[i] + (s2[i] == 'C');
    }
}
int get_distance(int x, int y){
    map<string, int>mp;
    int res = 0, cnt = 0;
    if(prefA[y + 1] - prefA[x] != pref2A[y + 1] - pref2A[x])return -1;
    if(prefT[y + 1] - prefT[x] != pref2T[y + 1] - pref2T[x])return -1;
    if(prefC[y + 1] - prefC[x] != pref2C[y + 1] - pref2C[x])return -1;
    for(int i = x;i <= y;++i){
        string tempo = "";
        tempo += a[i];
        tempo += b[i];
        mp[tempo]++;
    }
    for(auto itr = mp.begin();itr != mp.end();++itr){
        string s = itr->first;
        if(s[0] == s[1])continue;
        string d = s;
        reverse(d.begin(), d.end());
        if(mp.count(d)){
//            cout << s << " " << d << "\n";
            int num = min(mp[d], mp[s]);
            res += num;
            mp[s] -= num;
            mp[d] -= num;
//            cout << mp[s] << " " << mp[d] << '\n';
        }
        cnt += mp[s];
    }
    if(cnt == 0)return res;
    return cnt - 1 + res;
}
//int main()
//{
//    string a, b;
//    cin >> a >> b;
//    init(a, b);
//    int q;
//    cin >> q;
//    while(q--){
//        int l, r;
//        cin >> l >> r;
//        cout << get_distance(l, r) << '\n';
//    }
//}

Compilation message (stderr)

dna.cpp: In function 'void init(std::string, std::string)':
dna.cpp:15:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   15 |     for(int i = 0;i < s1.size();++i){
      |                   ~~^~~~~~~~~~~

• Subtask 1: 21 / 21
• Subtask 2: 22 / 22
• Subtask 3: 0 / 13
• Subtask 4: 0 / 28
• Subtask 5: 0 / 16