Submission #1101126

#	Time	Username	Problem	Language	Result	Execution time	Memory
1101126		InvMOD	Nivelle (COCI20_nivelle)	C++14	110 / 110	159 ms	46356 KiB

nivelle

#include <bits/stdc++.h>
using namespace std;

#define gcd __gcd
#define fi first
#define se second
#define lcm(a, b) a*b/gcd(a,b)
#define sz(v) v.size()
#define pb push_back
#define el "\n"
#define pi pair<ll , ll>
#define all(v) (v).begin(), (v).end()
#define rev(v) reverse(all(v))
#define compact(v) v.erase(unique(all(v)), end(v))
///#define int long long

using ll = long long;
using ld = long double;
using ull = unsigned long long;

template<typename T> bool ckmx(T &a, T b){if(a < b) return a = b, true; return false;}
template<typename T> bool ckmn(T &a, T b){if(a > b) return a = b, true; return false;}

const int lg = 18;
const int N = 1e5+1;
const ll MOD = 1e9+7;
const ll INF = 1e18;




bool rmq[26][lg][N];

void preprocess(int n){
    for(int c = 0; c < 26; c++){
        for(int i = 1; (1<<i) <= n; i++){
            for(int j = 1; j + (1<<i)-1 <= n; j++){
                rmq[c][i][j] = (rmq[c][i-1][j] | rmq[c][i-1][j + (1<<(i-1))]);
            }
        }
    }
    return;
}

int distinct(int l, int r){
    int res = 0;
    int k = 31 - __builtin_clz(r-l+1);
    for(int i = 0; i < 26; i++){
        res += (rmq[i][k][l] | rmq[i][k][r-(1<<k)+1]);
    }
    return res;
}

bool larger(tuple<int,int,int> a, tuple<int,int,int> b){
    int range1 = get<2>(a) - get<1>(a) + 1;
    int range2 = get<2>(b) - get<1>(b) + 1;
    int disc1 = get<0>(a), disc2 = get<0>(b);
    return (disc1 * range2) > (disc2 * range1);
}

void solve()
{
    int n; cin >> n;
    string s; cin >> s;
    s = " " + s;
    for(int i = 1; i <= n; i++){
        rmq[s[i] - 'a'][0][i] = 1;
    }
    preprocess(n);
    tuple<int,int,int> mx = {1, 1, 1};
    for(int nd = 1; nd <= 26; nd++){
        int l = 1;
        for(int i = 1; i <= n; i++){
            while(distinct(l, i) > nd) l++;
            if(larger(mx, make_tuple(nd, l, i))) mx = make_tuple(nd, l, i);
        }
    }
    cout << get<1>(mx) <<" " << get<2>(mx) <<"\n";
}

signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    #define name "InvMOD"
    if(fopen(name".INP", "r")){
        freopen(name".INP","r",stdin);
        freopen(name".OUT","w",stdout);
    }

    int t = 1; //cin >> t;
    while(t--) solve();
    return 0;
}

Compilation message (stderr)

nivelle.cpp: In function 'int main()':
nivelle.cpp:89:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   89 |         freopen(name".INP","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
nivelle.cpp:90:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   90 |         freopen(name".OUT","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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