Compilare: main.cpp: In function 'int main()': main.cpp:9:13: warning: variable 'ok' set but not used [-Wunused-but-set-variable] int t,i,ok; ^~ main.cpp:10:27: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d\n",&t); ^ main.cpp:12:29: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(s,1000010,fin); ^