Compilare: user.cpp: In function ‘int main()’: user.cpp:26:18: warning: unused variable ‘j’ [-Wunused-variable] int n, m, i, j, x, y, c, rad, nod; ^ user.cpp:26:35: warning: unused variable ‘nod’ [-Wunused-variable] int n, m, i, j, x, y, c, rad, nod; ^ user.cpp: In function ‘void dfs(int)’: user.cpp:75:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < v[ nod ].size(); ++i ){ ^ user.cpp: In function ‘int main()’: user.cpp:23:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("domino.in","r",stdin); ^ user.cpp:24:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("domino.out","w",stdout); ^ user.cpp:31:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&m); ^ user.cpp:33:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^