Problem:
Score : 100 points

Problem Statement

There are S sheep and W wolves.

If the number of wolves is greater than or equal to that of sheep, the wolves will attack the sheep.

If the wolves will attack the sheep, print unsafe; otherwise, print safe.

Constraints

1 \leq S \leq 100

1 \leq W \leq 100

Input

Input is given from Standard Input in the following format:

S W

Output

If the wolves will attack the sheep, print unsafe; otherwise, print safe.

Sample Input 1

4 5

Sample Output 1

unsafe

There are four sheep and five wolves. The number of wolves is not less than that of sheep, so they will attack them.

Sample Input 2

100 2

Sample Output 2

safe

Many a sheep drive away two wolves.

Sample Input 3

10 10

Sample Output 3

unsafe

Solution in C (GCC 9.2.1) (judge verdict: Runtime Error)

#include <stdio.h>
#include <math.h>
#include <string.h>

void main() {

    int N;
    int i, j;
    int n = 0;
    int m;
    int chk;
    int count;
    int flag;
    char S[1000][11];
    char buf[1000];

    fgets(buf, sizeof(buf), stdin);
    sscanf(buf, "%d\n", &N);
    count = N;
    int k[N];

    for (i = 1; i <= N; i++) {
        fgets(buf, sizeof(buf), stdin);
        sscanf(buf, "%s\n", S[N]);
    }
    for (i = 1; i <= N; i++) {
        for (m = 0; m < n; m++) {
            flag = 0;
            if (k[m] == i) {
                flag = 1;
                break;
            } 
        }
        if (flag == 0) {
            for (j = N; j > i; j--){
                chk = strcmp(S[i], S[j]);
                if (0 == chk){
                    count--;
                    k[n] = S[j];
                    n++;
                }
            }
        }
    }
    printf ("%d", n+1);
    return;
}