Compilare: main.cpp: In function 'int main()': main.cpp:8:44: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ( "furnici.in" , "r" , stdin ) ; ^ main.cpp:9:46: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ( "furnici.out" , "w" , stdout ) ; ^ main.cpp:14:37: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d %d\n" , & l , & n ) ; ^ main.cpp:18:42: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d %c\n" , & x , & ch ) ; ^