Submission #559603

#	Time	Username	Problem	Language	Result	Execution time	Memory
559603		nghiass001	Mutating DNA (IOI21_dna)	C++17	100 / 100	53 ms	7412 KiB

dna

#include <bits/stdc++.h>
#define FOR(i,l,r) for(int i=(l); i<=(r); ++i)
#define REP(i,l,r) for(int i=(l); i<(r); ++i)
#define FORD(i,r,l) for(int i=(r); i>=(l); --i)
#define REPD(i,r,l) for(int i=(r)-1; i>=(l); --i)
using namespace std;
const int N = 1e5 + 5;
int M[256];
int pre[N][3][3];

void init(string a, string b) {
    M['A'] = 0; M['T'] = 1; M['C'] = 2;
    REP(i, 0, a.length()) {
        REP(j, 0, 3) REP(w, 0, 3) pre[i + 1][j][w] = pre[i][j][w];
        if (a[i] != b[i]) ++pre[i + 1][M[a[i]]][M[b[i]]];
    }
}

int choice[3][3];
int num[3];

int get_distance(int x, int y) {
    ++y;
    REP(i, 0, 3) num[i] = 0;
    REP(i, 0, 3) REP(j, 0, 3) {
        choice[i][j] = pre[y][i][j] - pre[x][i][j];
        num[i] += choice[i][j];
        num[j] -= choice[i][j];
    }
    REP(i, 0, 3) if (num[i]) return -1;
    int res = 0, m1 = 1e5, m2 = 1e5;
    REP(i, 0, 3) REP(j, i + 1, 3) {
        int tmp = min(choice[i][j], choice[j][i]);
        res += tmp;
        m2 = min(m2, max(choice[i][j], choice[j][i]) - tmp);
        if (m2 < m1) swap(m1, m2);
    }
    return res + m1 + m2;
}

Compilation message (stderr)

dna.cpp: In function 'void init(std::string, std::string)':
dna.cpp:3:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    3 | #define REP(i,l,r) for(int i=(l); i<(r); ++i)
      |                                    ^
dna.cpp:13:5: note: in expansion of macro 'REP'
   13 |     REP(i, 0, a.length()) {
      |     ^~~
dna.cpp:15:46: warning: array subscript has type 'char' [-Wchar-subscripts]
   15 |         if (a[i] != b[i]) ++pre[i + 1][M[a[i]]][M[b[i]]];
      |                                              ^
dna.cpp:15:55: warning: array subscript has type 'char' [-Wchar-subscripts]
   15 |         if (a[i] != b[i]) ++pre[i + 1][M[a[i]]][M[b[i]]];
      |                                                       ^

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