oj.uz

Submission #11113

# Submission time Handle Problem Language Result Execution time Memory
11113 2014-11-13T23:47:59 Z gs14004 Three Friends (BOI14_friends) C++
100 / 100
 44 ms 18664 KB 
#include <cstdio>
#include <cstdlib>

int n;
char str[2000005];

long long pow[2000005], l_hash, r_hash, c_hash;
int result = -1;

void input(){
    scanf("%d %s",&n,str);
    if(!(n&1)){
        puts("NOT POSSIBLE");
        exit(0);
    }
    pow[0] = 1;
    for (int i=1; i<n; i++) {
        pow[i] = pow[i-1] * 697;
    }
}

void output(){
    if(result == -1) puts("NOT POSSIBLE");
    else{
        int p = 0;
        for (int i=0; i<n/2+p; i++) {
            if(i == result){
                p++;
                continue;
            }
            putchar(str[i]);
        }
    }
}

void calc_left(long long l_hash, long long r_hash){
    int piv = 0;
    for (int i=n/2-1; i>=0; i--) {
        l_hash -= pow[piv] *(str[i] - str[i+1]);
        if(l_hash == r_hash && l_hash != c_hash){
            if(~result){
                puts("NOT UNIQUE");
                exit(0);
            }
            else result = i, c_hash = l_hash;
        }
        piv++;
    }
}

void calc_right(long long l_hash, long long r_hash){
    int piv = n/2-1;
    for (int i=n/2+1; i<n; i++) {
        r_hash += (str[i-1] -str[i]) * pow[piv];
        if(l_hash == r_hash && l_hash != c_hash){
            if(~result){
                puts("NOT UNIQUE");
                exit(0);
            }
            else result = i, c_hash = l_hash;
        }
        piv--;
    }
}

int main(){
    input();
    for (int i=0; i<n/2; i++) {
        l_hash *= 697;
        r_hash *= 697;
        l_hash += str[i] - 'A';
        r_hash += str[n/2 + 1 + i] - 'A';
    }
    if(l_hash == r_hash) result = n/2, c_hash = l_hash;
    calc_left(l_hash,r_hash);
    calc_right(l_hash,r_hash);
    output();
}

Subtask #1
35.0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 18664 KB Output is correct
2 Correct 0 ms 18664 KB Output is correct
3 Correct 0 ms 18664 KB Output is correct
4 Correct 0 ms 18664 KB Output is correct
5 Correct 0 ms 18664 KB Output is correct
6 Correct 0 ms 18664 KB Output is correct
7 Correct 0 ms 18664 KB Output is correct
8 Correct 0 ms 18664 KB Output is correct
9 Correct 0 ms 18664 KB Output is correct
10 Correct 0 ms 18664 KB Output is correct
11 Correct 0 ms 18664 KB Output is correct
12 Correct 0 ms 18664 KB Output is correct
13 Correct 0 ms 18664 KB Output is correct
14 Correct 0 ms 18664 KB Output is correct
15 Correct 0 ms 18664 KB Output is correct
16 Correct 0 ms 18664 KB Output is correct
17 Correct 0 ms 18664 KB Output is correct
18 Correct 0 ms 18664 KB Output is correct
19 Correct 0 ms 18664 KB Output is correct
20 Correct 0 ms 18664 KB Output is correct
21 Correct 0 ms 18664 KB Output is correct
22 Correct 0 ms 18664 KB Output is correct
23 Correct 0 ms 18664 KB Output is correct
24 Correct 0 ms 18664 KB Output is correct
25 Correct 0 ms 18664 KB Output is correct
26 Correct 0 ms 18664 KB Output is correct
27 Correct 0 ms 18664 KB Output is correct
28 Correct 0 ms 18664 KB Output is correct
29 Correct 0 ms 18664 KB Output is correct
30 Correct 0 ms 18664 KB Output is correct
31 Correct 0 ms 18664 KB Output is correct
32 Correct 0 ms 18664 KB Output is correct
33 Correct 0 ms 18664 KB Output is correct
34 Correct 0 ms 18664 KB Output is correct
35 Correct 0 ms 18664 KB Output is correct
36 Correct 0 ms 18664 KB Output is correct
37 Correct 0 ms 18664 KB Output is correct
38 Correct 0 ms 18664 KB Output is correct
39 Correct 0 ms 18664 KB Output is correct
40 Correct 0 ms 18664 KB Output is correct
41 Correct 0 ms 18664 KB Output is correct
42 Correct 0 ms 18664 KB Output is correct
43 Correct 0 ms 18664 KB Output is correct
44 Correct 0 ms 18664 KB Output is correct
45 Correct 0 ms 18664 KB Output is correct
46 Correct 0 ms 18664 KB Output is correct
47 Correct 0 ms 18664 KB Output is correct
48 Correct 0 ms 18664 KB Output is correct
49 Correct 0 ms 18664 KB Output is correct
50 Correct 0 ms 18664 KB Output is correct
51 Correct 0 ms 18664 KB Output is correct
52 Correct 0 ms 18664 KB Output is correct
53 Correct 0 ms 18664 KB Output is correct
54 Correct 0 ms 18664 KB Output is correct

Subtask #2
65.0 / 65.0

# Verdict Execution time Memory Grader output
1 Correct 36 ms 18664 KB Output is correct
2 Correct 44 ms 18664 KB Output is correct
3 Correct 36 ms 18664 KB Output is correct
4 Correct 32 ms 18664 KB Output is correct
5 Correct 32 ms 18664 KB Output is correct
6 Correct 8 ms 18664 KB Output is correct
7 Correct 40 ms 18664 KB Output is correct
8 Correct 16 ms 18664 KB Output is correct
9 Correct 32 ms 18664 KB Output is correct
10 Correct 40 ms 18664 KB Output is correct
11 Correct 12 ms 18664 KB Output is correct
12 Correct 0 ms 18664 KB Output is correct
13 Correct 0 ms 18664 KB Output is correct
14 Correct 0 ms 18664 KB Output is correct
15 Correct 0 ms 18664 KB Output is correct
16 Correct 0 ms 18664 KB Output is correct
17 Correct 0 ms 18664 KB Output is correct
18 Correct 0 ms 18664 KB Output is correct
19 Correct 0 ms 18664 KB Output is correct
20 Correct 0 ms 18664 KB Output is correct
21 Correct 0 ms 18664 KB Output is correct
22 Correct 0 ms 18664 KB Output is correct
23 Correct 0 ms 18664 KB Output is correct
24 Correct 0 ms 18664 KB Output is correct
25 Correct 0 ms 18664 KB Output is correct
26 Correct 0 ms 18664 KB Output is correct
27 Correct 0 ms 18664 KB Output is correct
28 Correct 0 ms 18664 KB Output is correct
29 Correct 0 ms 18664 KB Output is correct
30 Correct 0 ms 18664 KB Output is correct
31 Correct 0 ms 18664 KB Output is correct
32 Correct 0 ms 18664 KB Output is correct
33 Correct 0 ms 18664 KB Output is correct
34 Correct 0 ms 18664 KB Output is correct
35 Correct 0 ms 18664 KB Output is correct
36 Correct 0 ms 18664 KB Output is correct
37 Correct 0 ms 18664 KB Output is correct
38 Correct 0 ms 18664 KB Output is correct
39 Correct 0 ms 18664 KB Output is correct
40 Correct 0 ms 18664 KB Output is correct
41 Correct 0 ms 18664 KB Output is correct
42 Correct 0 ms 18664 KB Output is correct
43 Correct 0 ms 18664 KB Output is correct
44 Correct 0 ms 18664 KB Output is correct
45 Correct 0 ms 18664 KB Output is correct
46 Correct 0 ms 18664 KB Output is correct
47 Correct 0 ms 18664 KB Output is correct
48 Correct 0 ms 18664 KB Output is correct
49 Correct 0 ms 18664 KB Output is correct
50 Correct 0 ms 18664 KB Output is correct
51 Correct 0 ms 18664 KB Output is correct
52 Correct 0 ms 18664 KB Output is correct
53 Correct 0 ms 18664 KB Output is correct
54 Correct 0 ms 18664 KB Output is correct