Submission #1141967

#	Time	Username	Problem	Language	Result	Execution time	Memory
1141967		ashen_x	Mutating DNA (IOI21_dna)	C++20	Compilation error	0 ms	0 KiB

dna

#include <bits/stdc++.h>
using namespace std;
//cout<<
//cin>>
int swa=0;
vector<int>v;

bool chars(string x, string y){
    sort(x.begin(),x.end());
    sort(y.begin(),y.end());
    if(x!=y){
        return true;
    }
    return false;
}
int solve(string A,string B){

    int l;
    int f=-1;
    for(int i=0;i<A.size();i++){
        if(A[i]!=B[i] && i!=f){
            v.push_back(i);
        }
    }
    if(v.size()%2==0){
        l=v.size();
    }
    else{
        l=v.size()-1;
        f=v.back();
    }
    for(int i=0;i<l-1;i+=2){
        swap(A[v[i]],A[v[i+1]]);
        v.erase(v.begin()+i);
        v.erase(v.begin()+i);
        swa++;
    }
    if(A!=B){
        solve(A,B);
    }
    return swa;
}
int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int size,q;
    cin>>size>>q;
    int aa,bb;
    string a,b;
    cin>>a>>b;
    while(q--){
        cin>>aa>>bb;
        string aaa=a.substr(aa,bb);
        string bbb=b.substr(aa,bb);
        if(chars(aaa,bbb)){
            cout<<-1<<'\n';
            continue;
        }
        cout<<solve(aaa,bbb);
        swa=0;
        v.clear();
        cout<<'\n';
    }
    
}

Compilation message (stderr)

/usr/bin/ld: /tmp/ccBTaSFK.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccZgulEZ.o:dna.cpp:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/ccBTaSFK.o: in function `main':
grader.cpp:(.text.startup+0x363): undefined reference to `init(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)'
/usr/bin/ld: grader.cpp:(.text.startup+0x39a): undefined reference to `get_distance(int, int)'
collect2: error: ld returned 1 exit status