Submission #42967

#	Time	Username	Problem	Language	Result	Execution time	Memory
42967		BThero	Three Friends (BOI14_friends)	C++14	35 / 100	12 ms	4672 KiB

friends

#include <bits/stdc++.h>

#define pb push_back
#define mp make_pair

#define fi first
#define se second

typedef long long ll;

using namespace std;

char ans[2000005];

char s[2000005];

char t[2000005];

int n, sz;

void solve() {
    scanf("%d", &n);
    scanf("%s", s);

    if (n % 2 == 0) {
        printf("NOT POSSIBLE\n");
        return;
    }

    assert(n <= 5000);

    int len = (n - 1) / 2;
    bool did = 0;

    for (int i = 0; i < n; ++i) {
        sz = 0;

        for (int j = 0; j < n; ++j) {
            if (j != i) {
                t[sz++] = s[j];
            }
        }

        bool ok = 1;

        for (int j = 0; j < len; ++j) {
            if (t[j] != t[j + len]) {
                ok = 0;
            }
        }

        if (ok) {
            if (did) {
                for (int j = 0; j < len; ++j) {
                    if (t[j] != ans[j]) {
                        printf("NOT UNIQUE\n");
                        return;
                    }
                }
            }

            did = 1;

            for (int j = 0; j < len; ++j) {
                ans[j] = t[j];
            }
        }
    }

    if (!did) {
        printf("NOT POSSIBLE\n");
        return;
    }

    for (int i = 0; i < len; ++i) {
        printf("%c", ans[i]);
    }
}

int main() {
    #ifdef BThero
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
    #endif // BThero

    int tt = 1;

    while (tt--) {
        solve();
    }

    return 0;
}

Compilation message (stderr)

friends.cpp: In function 'void solve()':
friends.cpp:22:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
                    ^
friends.cpp:23:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%s", s);
                   ^

• Subtask 1: 35 / 35
• Subtask 2: 0 / 65