Submission #1105938

#	Time	Username	Problem	Language	Result	Execution time	Memory
1105938		RiverFlow	Genetics (BOI18_genetics)	C++14	46 / 100	2065 ms	85960 KiB

genetics

#include <bits/stdc++.h>

#define nl "\n"
#define no "NO"
#define yes "YES"
#define fi first
#define se second
#define vec vector
#define task "main"
#define _mp make_pair
#define ii pair<int, int>
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define evoid(val) return void(std::cout << val)
#define FOR(i, a, b) for(int i = (a); i <= (b); ++i)
#define FOD(i, b, a) for(int i = (b); i >= (a); --i)
#define unq(x) sort(all(x)); x.resize(unique(all(x)) - x.begin())

using namespace std;

template<typename U, typename V> bool maxi(U &a, V b) {
    if (a < b) { a = b; return 1; } return 0;
}
template<typename U, typename V> bool mini(U &a, V b) {
    if (a > b) { a = b; return 1; } return 0;
}

const int mod = (int)1e9 + 7;

void prepare(); void main_code();

int main() {
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    if (fopen(task".inp", "r")) {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    const bool MULTITEST = 0; prepare();
    int num_test = 1; if (MULTITEST) cin >> num_test;
    while (num_test--) { main_code(); }
}

void prepare() {};

const int N = (int)4100 + 9;

int cnt[N][4];
int cv(char c) {
    if (c == 'A') return 0;
    if (c == 'C') return 1;
    if (c == 'G') return 2;
    return 3;
}

int rel[N][N];
string s[N];

void main_code() {
    int n, m, k;
    cin >> n >> m >> k;
    FOR(i, 1, n) {
        cin >> s[i];
        FOR(j, 0, m - 1) {
            char c = s[i][j];
            ++cnt[j][cv(c)];
        }
    }
    memset(rel, -1, sizeof rel);
    vec<int> ch;
    FOR(i, 1, n) {
        int sum = 0;
        FOR(j, 0, m - 1) {
            int t = cv(s[i][j]);
            FOR(l, 0, 3) if (l != t)
                sum += cnt[j][l];
        }
        if (sum == k * (n - 1)) {
            ch.push_back(i);
        }
    }
    vec<int>nch;
    int cnt=0;
    for(int i:ch){
        bool ok=1;
        ++cnt;
        if (cnt > 500)break;
        for(int j:ch)if (i!=j){
            if (ok==0)break;
            if (rel[i][j] != -1) {
                ok &= rel[i][j];
                continue;
            }
            int cx = 0;
            FOR(t, 0, m - 1){
                cx += s[i][t] != s[j][t];
                if(cx>k)break;
            }
            rel[i][j]=rel[j][i]=(cx==k);
            ok&=rel[i][j];
        }
        if(ok)nch.push_back(i);
    }
    if (sz(nch) == 1) {
        cout << nch[0];
        return ;
    }
    random_shuffle(all(nch));
    for(int i : nch) {
        bool ok=1;
        FOR(j, 1, n) if (i!=j){
            if (ok==0)break;
            if (rel[i][j] != -1) {
                ok &= rel[i][j];
                continue;
            }
            int cx = 0;
            FOR(t, 0, m - 1){
                cx += s[i][t] != s[j][t];
                if(cx>k)break;
            }
            rel[i][j]=rel[j][i]=(cx==k);
            ok&=rel[i][j];
        }
        if (ok)evoid(i);
    }
}


/*     Let the river flows naturally     */

Compilation message (stderr)

genetics.cpp: In function 'int main()':
genetics.cpp:35:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
genetics.cpp:36:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 27 / 27
• Subtask 2: 19 / 19
• Subtask 3: 0 / 28
• Subtask 4: 0 / 26