Compilare: user.cpp: In function ‘int main()’: user.cpp:91:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1; i < diam.size(); i++) ^ user.cpp:63:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("revolta.in", "r", stdin); ^ user.cpp:64:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("revolta.out", "w", stdout); ^ user.cpp:66:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &t); ^ user.cpp:68:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i", &n); ^ user.cpp:73:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i%i", &x, &y); ^ user.cpp: In function ‘void DFS_diam(int)’: user.cpp:37:19: warning: ‘a’ may be used uninitialized in this function [-Wmaybe-uninitialized] dr = a; ^