Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:16:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<g[x].size(); i++){ ~^~~~~~~~~~~~ user.cpp: In function ‘void dfs1(int)’: user.cpp:28:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<g[x].size(); i++){ ~^~~~~~~~~~~~ user.cpp: In function ‘void dfs2(int)’: user.cpp:44:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<g[x].size(); i++){ ~^~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:53:16: warning: unused variable ‘ok’ [-Wunused-variable] int i, a, b, ok, poz; ^~ user.cpp:55:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ user.cpp:58:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &a, &b); ^