Compilare: main.cpp: In function 'int main()': main.cpp:97:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<strlen(sir)-1; ++i) ~^~~~~~~~~~~~~~ main.cpp:95:26: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(sir, 1002, fin); ^ main.cpp:102:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d\n", &n); ^