This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#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[maxn][26];
string s;
int CNT(int l, int r){
int ans = 0;
for(int i = 0; i < 26; i++) ans += (cnt[r][i] - cnt[l - 1][i] > 0);
return ans;
}
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 i = 1; i <= n; i++){
for(int j = 0; j < 26; j++){
cnt[i][j] = cnt[i - 1][j] + ((s[i] - 'a') == j);
}
}
ld res = 1e18;
pair<int, int> ans;
for(int num = 1; num <= 26; num++){
for(int i = 1; i <= n - num + 1; i++){
int l = i, r = n, pos = -1;
while(r - l >= 0){
int mid = (l + r) >> 1;
if(CNT(i, mid) <= num){
pos = mid;
l = mid + 1;
}
else r = mid - 1;
}
if(pos != -1 && CNT(i, pos) == num){
ld val = num / (1.0 * (pos - i + 1));
if(res > val){
res = val;
ans = {i, pos};
}
}
}
}
cout << ans.first << " " << ans.second << "\n";
return 0;
}
Compilation message (stderr)
nivelle.cpp: In function 'int main()':
nivelle.cpp:57:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
57 | freopen(TASK".inp", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
nivelle.cpp:58:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
58 | freopen(TASK".out", "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
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