#include <iostream>
#include <bits/stdc++.h>
#include <cmath>
#include <algorithm>
#include <vector>
#include <deque>
#include <set>
#include <stack>
#include <string>
#include <map>
#include <queue>
#define int long long
#define sqrt sqrtl
using namespace std;
const long long oo = 1000000000000000000;
long long sum, ans = 0, mx = 0, mn = 1000000000, num, pos;
/*
ViHHiPuh
(( `'-""``""-'` ))
)-__-_.._-__-(
/ --- (o _ o) --- \
\ .-* ( .0. ) *-. /
_'-. ,_ '=' _, .-'_
/ `;#'#'# - #'#'#;` \
\_)) -----'#'----- ((_/
# --------- #
'# ------- ------ #'
/..-'# ------- #'-.\
_\...-\'# -- #'/-.../_
((____)- '#' -(____))
cout << fixed << setprecision(6) << x;
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
freopen ( "sum.in", "r", stdin )
*/
int p[ 200001 ], sf[ 200001 ], mp[ 200001 ];
int pp[ 200001 ], sff[ 200001 ], mpp[ 200001 ];
int nxt[ 200001 ];
main () {
int n, m;
cin >> n >> m;
string s;
cin >> s;
while ( s.size() && s.back() != 'I' )
s.pop_back();
reverse( s.begin(), s.end() );
while ( s.size() && s.back() != 'J' )
s.pop_back();
reverse( s.begin(), s.end() );
for ( int i = 0; i < s.size(); i ++ ) {
if ( i )
p[ i ] = p[ i - 1 ], sf[ i ] = sf[ i - 1 ], mp[ i ] = mp[ i - 1 ], pp[ i ] = pp[ i - 1 ], mpp[ i ] = mpp[ i - 1 ], sff[ i ] = sff[ i - 1 ];
if ( s[ i ] == 'J' ) {
p[ i ] ++;
pp[ i] = i;
}
else if ( s[ i ] == 'O' )
sf[ i ] ++, sff[ i ] = i;
else
mp[ i ] ++, mpp[ i ] = i;
}
for ( int i = s.size() - 1; i >= 0; i -- ) {
if ( s[ i ] == 'I' )
nxt[ i ] = i;
else
nxt[ i ] = nxt[ i + 1 ];
}
int l, r, mid;
ans = oo;
for ( int i = 0; i < s.size(); i ++ ) {
if ( s[ i ] != 'J' || p[ i ] < m )
continue;
l = 0;
r = i;
sum = 0;
while ( r - l > 1 ) {
mid = ( l + r ) / 2;
if ( p[ i ] - p[ mid ] + 1 >= m )
l = mid;
else
r = mid - 1;
}
if ( p[ i ] - p[ l ] + 1 < m )
continue;
if ( p[ i ] - p[ r ] + 1 >= m )
l = r;
l = pp[ l ];
sum += i - l + 1 - m;
l = i;
r = s.size() - 1;
while ( r > l ) {
mid = ( l + r ) / 2;
if ( sf[ mid ] - sf[ i ] >= m )
r = mid;
else
l = mid + 1;
}
if ( sf[ l ] - sf[ i ] < m )
continue;
l = sff[ l ];
sum += l - i - m;
pos = nxt[ l ];
l = pos;
r = s.size() - 1;
while ( r > l ) {
mid = ( l + r ) / 2;
if ( mp[ mid ] - mp[ pos ] + 1 >= m )
r = mid;
else
l = mid + 1;
}
if ( mp[ l ] - mp[ pos ] + 1 < m )
continue;
l = mpp[ l ];
sum += l - pos + 1 - m;
ans = min( ans, sum );
}
if ( ans == oo )
cout << "-1";
else
cout << ans;
}
Compilation message
ho_t2.cpp:51:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
51 | main () {
| ^~~~
ho_t2.cpp: In function 'int main()':
ho_t2.cpp:62:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
62 | for ( int i = 0; i < s.size(); i ++ ) {
| ~~^~~~~~~~~~
ho_t2.cpp:82:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
82 | for ( int i = 0; i < s.size(); i ++ ) {
| ~~^~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
340 KB |
Output is correct |
| 2 |
Incorrect |
1 ms |
340 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
340 KB |
Output is correct |
| 2 |
Incorrect |
1 ms |
340 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
340 KB |
Output is correct |
| 2 |
Incorrect |
1 ms |
340 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
