Submission #772642

#	Time	Username	Problem	Language	Result	Execution time	Memory
772642		hgmhc	JOIOJI (JOI14_joioji)	C++17	100 / 100	33 ms	6064 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, ans;
char s[N];
map<ii,ii> m;

int main() {
    scanf("%d %s ", &n, s+1);
    int j=0, o=0, i=0;
    m[{0,0}]={0,0};
    rep(k,1,n) {
        if(s[k]=='J')j++;
        if(s[k]=='O')o++;
        if(s[k]=='I')i++;
        if (m.count({j-o,o-i})) m[{j-o,o-i}].se = k;
        else m[{j-o,o-i}] = {k,k};
    }
    for (auto [k,v] : m) Mup(ans, v.se-v.fi);
    printf("%d", ans);
}

Compilation message (stderr)

joioji.cpp: In function 'int main()':
joioji.cpp:20:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |     scanf("%d %s ", &n, s+1);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~

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