Compilare: user.cpp: In function ‘void prim()’: user.cpp:30:7: warning: unused variable ‘nr’ [-Wunused-variable] int nr = 0; ^ user.cpp: In function ‘int main()’: user.cpp:63:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < apm.size(); i++) { ^ user.cpp: In function ‘void citire()’: user.cpp:16:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d ", &n, &m); ^ user.cpp:19:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d ", &x, &y, &cost); ^ user.cpp: In function ‘int main()’: user.cpp:55:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("apm.in", "r", stdin); ^ user.cpp:56:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("apm.out", "w", stdout); ^