Submission #1142217

#	Time	Username	Problem	Language	Result	Execution time	Memory
1142217		programming23	Mutating DNA (IOI21_dna)	C++20	0 / 100	474 ms	2764 KiB

dna

#include "bits/stdc++.h"
using namespace std;

string stringA="";
string stringB="";
vector<int> arrCount;


void init(string a, string b) {
	stringA = a;
	stringB = b;
    int ln = stringA.size();
    arrCount.resize(ln);
    int count = 0;
    for(int i=ln-1; i>=0;i--){
        if (stringA[i] != stringB[i]){
            count+=1;
        }
        arrCount[i] = count;
    }
    
}

int get_distance(int x, int y) {
	string sA = stringA;
	string sB = stringB;
	map<char, int> countsB;
	map<char, int> countsA;
    int ln = sA.size();
	int count = 0;
	for(int i=x; i <= y; i++){
		if(countsA.find(sA[i]) == countsA.end()){
			countsA[sA[i]] = 1;
		}else{
			countsA[sA[i]] +=1;
		}
		if(countsB.find(sB[i]) == countsB.end()){
			countsB[sB[i]] = 1;
		}else{
			countsB[sB[i]] +=1;
		}
	}
    int lnA = countsA.size();
    int lnB = countsB.size();
	if(lnA != lnB){
		return -1;
	}for(auto c: countsA){
		if(countsA[c.first] != countsB[c.first]){
			return -1;
		}
	}
    if(lnA == 2 && lnB == 2){
        count = arrCount[x];
        if(y+1 <= ln){
            count-=arrCount[y+1];
        }
        return count/2;
    }

    int i=x;
    while (i <= y && sA != sB){
        char c = sA[i];
        if(c == sB[i]){
            i++;
            continue;
        }
        for(int z=i+1; z <= y; z++){
            if(sA[z] != sB[i] || sA[z] == sB[z]){
                continue;
            }
            sA[i] = sA[z];
            sA[z] = c;
            i++;
            count++;
        }
    }
	return count;
}

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