C语言

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

int main() {
    char compressed[101];
    scanf("%s", compressed);
    
    char decompressed[901] = {0};  
    int decompressed_idx = 0;
    
    for (int i = 0; compressed[i] != '\0'; i++) {
        char c = compressed[i];
        
        if (c == '0' || c == '1') {
            if (compressed[i + 1] >= '2' && compressed[i + 1] <= '9') {
                int count = compressed[i + 1] - '0';
                for (int j = 0; j < count; j++) {
                    decompressed[decompressed_idx++] = c;
                }
                i++; 
            } else {
                decompressed[decompressed_idx++] = c;
            }
        }
    }
    
    decompressed[decompressed_idx] = '\0'; 
    printf("%s\n", decompressed);
    
    return 0;
}