Compilare: main.cpp: In function 'int main()': main.cpp:10:25: warning: unused variable 'lin' [-Wunused-variable] int n , m , i , j , lin , poz , nr , k; ^~~ main.cpp:10:31: warning: unused variable 'poz' [-Wunused-variable] int n , m , i , j , lin , poz , nr , k; ^~~ main.cpp:10:37: warning: unused variable 'nr' [-Wunused-variable] int n , m , i , j , lin , poz , nr , k; ^~ main.cpp:10:42: warning: unused variable 'k' [-Wunused-variable] int n , m , i , j , lin , poz , nr , k; ^ main.cpp:11:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d\n",&n,&m); ^ main.cpp:13:37: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(b[i] + 1 , 2010 , fin); ^