Submission #772638

#	Time	Username	Problem	Language	Result	Execution time	Memory
772638		hgmhc	JOIOJI (JOI14_joioji)	C++17	0 / 100	1 ms	212 KiB

joioji

#include <bits/stdc++.h>
using namespace std; using ii = pair<int,int>; using ll = long long;
#define rep(i,a,b) for (auto i = (a); i <= (b); ++i)
#define per(i,a,b) for (auto i = (b); i >= (a); --i)
#define all(x) begin(x), end(x)
#define siz(x) int((x).size())
#define Mup(x,y) x = max(x,y)
#define mup(x,y) x = min(x,y)
#define fi first
#define se second
#define dbg(...) fprintf(stderr,__VA_ARGS__)


const int N = 2e5+3;
int n;
char s[N];

bool valid(int x) {
    int c[256]{};
    rep(i,1,3*x) c[int(s[i])]++;
    rep(i,1,n-3*x+1) {
        if (c['J'] == x and c['O'] == x and c['I'] == x) return true;
        c[int(s[i])]--, i+3*x>n?0:c[int(s[i+3*x])]++;
    }
    return false;
}

int main() {
    scanf("%d %s ", &n, s+1);
    int x = 1, y = n/3, m;
    while (x <= y) {
        m = (x+y)/2;
        if (valid(m)) x = m+1;
        else y = m-1;
    }
    if (n < 3) puts("0");
    else printf("%d", 3*y);
}

Compilation message (stderr)

joioji.cpp: In function 'int main()':
joioji.cpp:29:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |     scanf("%d %s ", &n, s+1);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 15
• Subtask 3: 0 / 80