Submission #771970

#	Time	Username	Problem	Language	Result	Execution time	Memory
771970		Trisanu_Das	JJOOII 2 (JOI20_ho_t2)	C++17	100 / 100	23 ms	3052 KiB

ho_t2

#include <bits/stdc++.h>
using namespace std;
 
int N, K;
char s[202020];
int js[202020], os[202020], is[202020];
int main()
{
    scanf("%d%d", &N, &K);
    scanf("%s", s+1);
    for(int i=1; i<=N; ++i)
    {
        js[i] = js[i-1], os[i] = os[i-1], is[i] = is[i-1];
        if(s[i] == 'J') ++js[i];
        if(s[i] == 'O') ++os[i];
        if(s[i] == 'I') ++is[i];
    }
    int ans = -1;
    for(int i=0; i<N; ++i)
    {
        int np = i;
        int jp = lower_bound(js+np, js+N+1, js[np]+K) - js;
        if(jp == N+1) break; 
        int op = lower_bound(os+jp, os+N+1, os[jp]+K) - os;
        if(op == N+1) break; 
        int ip = lower_bound(is+op, is+N+1, is[op]+K) - is;
        if(ip == N+1) break;
        if(ans == -1) ans = ip-np-3*K;
        else ans = min(ans, ip-np-3*K);
    }
    printf("%d\n", ans);
}

Compilation message (stderr)

ho_t2.cpp: In function 'int main()':
ho_t2.cpp:9:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |     scanf("%d%d", &N, &K);
      |     ~~~~~^~~~~~~~~~~~~~~~
ho_t2.cpp:10:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   10 |     scanf("%s", s+1);
      |     ~~~~~^~~~~~~~~~~

• Subtask 1: 1 / 1
• Subtask 2: 12 / 12
• Subtask 3: 87 / 87