Compilare: user.cpp: In function ‘int main()’: user.cpp:109:9: warning: unused variable ‘nr’ [-Wunused-variable] int nr=0; ^~ user.cpp:70:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rj.in", "r", stdin); ^ user.cpp:73:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n", &n, &m); ^ user.cpp:77:35: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(linie+1, 105, stdin); ^ user.cpp:97:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("\n"); ^ user.cpp:105:22: warning: ‘pjr’ may be used uninitialized in this function [-Wmaybe-uninitialized] lee(ro, pir, pjr); ^ user.cpp:105:22: warning: ‘pir’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:104:22: warning: ‘pjj’ may be used uninitialized in this function [-Wmaybe-uninitialized] lee(ju, pij, pjj); ^ user.cpp:104:22: warning: ‘pij’ may be used uninitialized in this function [-Wmaybe-uninitialized] In file included from /usr/include/stdio.h:936:0, from /usr/include/c++/6/cstdio:42, from user.cpp:1: In function ‘char* fgets(char*, int, FILE*)’, inlined from ‘int main()’ at user.cpp:77:35: /usr/include/bits/stdio2.h:261:58: warning: call to ‘__fgets_chk_warn’ declared with attribute warning: fgets called with bigger size than length of destination buffer return __fgets_chk_warn (__s, __bos (__s), __n, __stream); ^