Compilare: main.cpp: In function 'int main()': main.cpp:17:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d ", &n, &k); ^ main.cpp:18:25: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(s, MAXN + 2, in); ^ main.cpp:32:45: warning: 'l' may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(out, "%d", (d[l][k][0] + d[l][k][1]) % MOD); ~~~~~~~~~^