Submission #1097676

#	Time	Username	Problem	Language	Result	Execution time	Memory
1097676		Warinchai	Mutating DNA (IOI21_dna)	C++17	0 / 100	21 ms	5916 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 difA[100005];
int difC[100005];
int difT[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;
        same[i+1]=same[i];
        if(a[i+1]==b[i+1])same[i+1]++;
    }
}

int get_distance(int x, int y) {
    x++,y++;
    long long ta=(vala[y]+md-vala[x-1])%md;
    long long tb=(valb[y]+md-valb[x-1])%md;
    if(ta!=tb)return -1;
    int val=y-x+1-same[y]-same[x-1];
	return val/2;
}

Compilation message (stderr)

dna.cpp: In function 'void init(std::string, std::string)':
dna.cpp:13:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   13 |     for(int i=0;i<a.size();i++){
      |                 ~^~~~~~~~~
dna.cpp:12:15: warning: unused variable 'ta' [-Wunused-variable]
   12 |     long long ta=0,tb=0;
      |               ^~
dna.cpp:12:20: warning: unused variable 'tb' [-Wunused-variable]
   12 |     long long ta=0,tb=0;
      |                    ^~

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