#include <stdio.h>
#include <stdlib.h>

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

int main(int argc, char *argv[]) {
    int N;
    scanf("%d", &N);
    int length[N] for (int i = 0; i < N; i++) scanf("%d", &length[i]);

    int flag = 1;
    for (int = 1; i < N; i++) {
        if (length[i] != length[0]) {
            flag = 0;
            break;
        }
    }

    if (flag == 1) {
        printf("Yes\n");
    } else
        printf("No\n");

    return 0;
}

/sandbox/1/a.c:9:15: error: expected ';' at end of declaration
        int length[N]
                     ^
                     ;
/sandbox/1/a.c:14:9: error: expected identifier or '('
        for(int=1;i<N;i++){
               ^
/sandbox/1/a.c:14:12: error: expected ';' in 'for' statement specifier
        for(int=1;i<N;i++){
                  ^
/sandbox/1/a.c:14:12: error: use of undeclared identifier 'i'
/sandbox/1/a.c:14:16: error: use of undeclared identifier 'i'
        for(int=1;i<N;i++){
                      ^
/sandbox/1/a.c:15:13: error: use of undeclared identifier 'i'
                if(length[i]!=length[0]){
                          ^
6 errors generated.