Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:21:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<d.size(); ++j)sol[i][d[j]]=sol[d[j]][i]=true; ^ user.cpp:22:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<g[i].size(); ++j)dfs(g[i][j]); ^ user.cpp: In function ‘int main()’: user.cpp:42:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<d.size(); ++i)printf("%d ", d[i]); ^ user.cpp:27:15: warning: unused variable ‘k’ [-Wunused-variable] int i, j, k, x; ^ user.cpp:27:18: warning: unused variable ‘x’ [-Wunused-variable] int i, j, k, x; ^ user.cpp:28:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("drumuri5.in", "r", stdin); ^ user.cpp:29:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("drumuri5.out", "w", stdout); ^ user.cpp:30:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:32:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &i, &j); ^