Compilare: user.cpp: In function ‘int main()’: user.cpp:81:58: warning: unused variable ‘u’ [-Wunused-variable] int N = get_int(), M = get_int(), start = get_int(), u, v; ^ user.cpp:81:61: warning: unused variable ‘v’ [-Wunused-variable] int N = get_int(), M = get_int(), start = get_int(), u, v; ^ user.cpp: At global scope: user.cpp:53:37: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) void put_int(int x) ^~~~~~~ user.cpp:41:36: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) int get_int() ^~~~~~~ user.cpp: In function ‘int main()’: user.cpp:77:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bfs.in", "r", stdin); ^ user.cpp:79:38: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, 1, 12500000, stdin); ^ user.cpp:106:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bfs.out", "w", stdout); ^