Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:30:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( i = 0; i < v[ k ].size(); ++i ){ ^ user.cpp: In function ‘int main()’: user.cpp:46:15: warning: unused variable ‘j’ [-Wunused-variable] int m, i, j, s, t, d, x, y, c, pas; ^ user.cpp:46:18: warning: unused variable ‘s’ [-Wunused-variable] int m, i, j, s, t, d, x, y, c, pas; ^ user.cpp:46:21: warning: unused variable ‘t’ [-Wunused-variable] int m, i, j, s, t, d, x, y, c, pas; ^ user.cpp:46:24: warning: unused variable ‘d’ [-Wunused-variable] int m, i, j, s, t, d, x, y, c, pas; ^ user.cpp:43:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("transport2.in","r",stdin); ^ user.cpp:44:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("transport2.out","w",stdout); ^ user.cpp:48:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:50:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&x,&y,&c); ^