Submission #1097688

#	Time	Username	Problem	Language	Result	Execution time	Memory
1097688		Warinchai	Mutating DNA (IOI21_dna)	C++17	56 / 100	25 ms	8208 KiB

dna

#include "dna.h"
#include<bits/stdc++.h>
using namespace std;
long long vala[100005];
long long valb[100005];
long long same[100005];
int aA[100005];
int aC[100005];
int aT[100005];
int bA[100005];
int bC[100005];
int bT[100005];
long long md=1e9+7;
void init(std::string a, std::string b) {
    long long ta=0,tb=0;
    for(int i=0;i<a.size();i++){
        vala[i+1]=((vala[i]*26)%md+a[i]-'A')%md;
        valb[i+1]=((valb[i]*26)%md+b[i]-'A')%md;
        aA[i+1]=aA[i],aC[i+1]=aC[i],aT[i+1]=aT[i];
        bA[i+1]=bA[i],bC[i+1]=bC[i],bT[i+1]=bT[i];
        if(a[i]=='A')aA[i+1]++;
        else if(a[i]=='T')aT[i+1]++;
        else aC[i+1]++;

        if(b[i]=='A')bA[i+1]++;
        else if(b[i]=='T')bT[i+1]++;
        else bC[i+1]++;
        
        //cerr<<"info:"<<vala[i+1]<<" "<<valb[i+1]<<"\n";
        same[i+1]=same[i];
        if(a[i]==b[i])same[i+1]++;
    }
}

int get_distance(int x, int y) {
    x++,y++;
    //cerr<<x<<" "<<y<<" "<<"info:\n";
    //cerr<<aA[y]-aA[x-1]<<" "<<aT[y]-aT[x-1]<<"\n";
    //cerr<<bA[y]-bA[x-1]<<" "<<bT[y]-bT[x-1]<<"\n";
    //cerr<<"\n";
    if(aA[y]-aA[x-1]!=bA[y]-bA[x-1])return -1;
    if(aT[y]-aT[x-1]!=bT[y]-bT[x-1])return -1;
    if(aC[y]-aC[x-1]!=bC[y]-bC[x-1])return -1;
    int val=y-x+1-same[y]+same[x-1];
    //cerr<<"ans:\n";
    //cerr<<y<<"-"<<x-1<<"-"<<same[y]<<"+"<<same[x-1]<<"\n";
	return (val+1)/2;
}

Compilation message (stderr)

dna.cpp: In function 'void init(std::string, std::string)':
dna.cpp:16:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |     for(int i=0;i<a.size();i++){
      |                 ~^~~~~~~~~
dna.cpp:15:15: warning: unused variable 'ta' [-Wunused-variable]
   15 |     long long ta=0,tb=0;
      |               ^~
dna.cpp:15:20: warning: unused variable 'tb' [-Wunused-variable]
   15 |     long long ta=0,tb=0;
      |                    ^~

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