Compilare: user.cpp: In function ‘void bfs(int, int)’: user.cpp:64:12: warning: variable ‘a’ set but not used [-Wunused-but-set-variable] int x, a; ^ user.cpp: In function ‘void dfs(int)’: user.cpp:88:15: warning: variable ‘p’ set but not used [-Wunused-but-set-variable] int a, b, p; ^ user.cpp: In function ‘int main()’: user.cpp:116:36: warning: variable ‘a’ set but not used [-Wunused-but-set-variable] int n, m, i, S, flow, minflow, a; ^ user.cpp:121:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("teroristi.in", "r", stdin); ^ user.cpp:122:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("teroristi.out", "w", stdout); ^ user.cpp:124:29: 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:125:13: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets (s); ^ user.cpp:131:17: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets (s); ^ /tmp/ccFqRtNV.o: In function `main': user.cpp:(.text.startup+0x72): warning: the `gets' function is dangerous and should not be used.