Codeforces Beta Round #60. Task B

#include <cstdio>

#define N 1005

int y[N], print[N];

int main()
{
    int n;
    scanf("%d ", &n);

    for (int i = 0; i < n; i++)
        scanf("%d ", y + i);

    int j = 0;
    for (int i = 1000; i <= 2011; )
    {
        int a = i, b = y[j], diff = 0;
        for (int k = 0; k < 4; k++)
        {
            if (a % 10 != b % 10) diff++;
            a /= 10, b /= 10;
        }

        if (diff < 2)
            print[j++] = i;
        else
            i++;

        if (j == n)
        {
            for (int k = 0; k < n; k++)
                printf("%d\n", print[k]);
            return 0;
        }
    }

    puts("No solution");

    return 0;
}