Submission #637643

#	Time	Username	Problem	Language	Result	Execution time	Memory
637643		4EVER	Nivelle (COCI20_nivelle)	C++11	110 / 110	37 ms	636 KiB

nivelle

#include <bits/stdc++.h>
//#pragma GCC optimize("O2")
//#pragma GCC target("avx,avx2,fma")
using namespace std;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

#define PB push_back
#define ALL(i_) i_.begin(), i_.end()
#define LOG2(x) (31 - __builtin_clz(x))
#define getBit(x, i) ((x >> i) & 1)
#define rd(l, r) (l + rng() % (r - l + 1))

typedef long long ll;
typedef long double ld;
typedef pair<int, int> ii;

template<class X, class Y> bool minimize(X &x, const Y &y){
    X eps = 1e-9;
    if (x > y + eps) {
        x = y;
        return 1;
    }
    return 0;
}

template<class X, class Y> bool maximize(X &x, const Y &y) {
    X eps = 1e-9;
    if (x + eps < y) {
        x = y;
        return 1;
    }
    return 0;
}

template<class T> T Abs(const T &x) { return (x < 0 ? -x : x); }

const int mod = (int) 1e9 + 7;
const int oo = (int) 1e9 + 99;
const int maxn = (int) 1e5 + 11;
const int LOG = (int) 17;
const ii dxy[] = { {-1, 0}, {1, 0}, {0, 1}, {0, -1} };

int n;
int cnt[26];
string s;
ld res = 1e18;
ii ans;

void Add(int i, int &val){
    ++cnt[s[i] - 'a'];
    if(cnt[s[i] - 'a'] == 1) ++val;
}

void Sub(int i, int &val){
    --cnt[s[i] - 'a'];
    if(cnt[s[i] - 'a'] == 0) --val;
}

void Update(int k, int l, int r){
    ld val = (1.0 * k) / (1.0 * r - 1.0 * l + 1.0);
    if(res > val){
        res = val;
        ans = {l, r};
    }
}

int main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    #define TASK "NIVELLE"
    if(fopen(TASK".inp", "r")) {
        freopen(TASK".inp", "r", stdin);
        freopen(TASK".out", "w", stdout);
    }
    cin >> n >> s;
    s = " " + s;
    for(int num = 1; num <= 26; num++){
        memset(cnt, 0, sizeof cnt);
        int cur = 0;
        for(int l = 1, r = 1; r <= n; r++){
            Add(r, cur);
            while(cur > num) Sub(l++, cur);
            Update(num, l, r);
        }
    }
    cout << ans.first << " " << ans.second << "\n";
    return 0;
}

Compilation message (stderr)

nivelle.cpp: In function 'int main()':
nivelle.cpp:71:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   71 |         freopen(TASK".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
nivelle.cpp:72:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   72 |         freopen(TASK".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 17 / 17
• Subtask 3: 13 / 13
• Subtask 4: 25 / 25
• Subtask 5: 48 / 48