Compilare: main.cpp: In function 'int main()': main.cpp:12:46: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ( "mostenire.in" , "r" , stdin ) ; ^ main.cpp:13:48: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ( "mostenire.out" , "w" , stdout ) ; ^ main.cpp:17:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d%d" , & n , & k ) ; ^ main.cpp:20:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d" , & v [ i ] ) ; ^ main.cpp:90:20: warning: 'llen' may be used uninitialized in this function [-Wmaybe-uninitialized] printf ( "%d %d\n" , k - j + 1 , len + llen ) ; ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:88:31: warning: 'lval' may be used uninitialized in this function [-Wmaybe-uninitialized] if ( sol [ j ] == sum + lval ) ~~~~^~~~~~