Compilare: user.cpp: In function ‘void afisare_fake()’: user.cpp:15:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<v[i].size(); j++) ~^~~~~~~~~~~~ user.cpp: In function ‘int dfs(int, bool*)’: user.cpp:37:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[node].size(); i++) ~^~~~~~~~~~~~~~~ user.cpp: In function ‘void remove_edge(int, int)’: user.cpp:44:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[node].size(); i++) ~^~~~~~~~~~~~~~~ user.cpp:50:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[node2].size(); i++) ~^~~~~~~~~~~~~~~~ user.cpp: In function ‘void add_edge(int, int)’: user.cpp:59:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[node].size(); i++) ~^~~~~~~~~~~~~~~ user.cpp:65:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[node2].size(); i++) ~^~~~~~~~~~~~~~~~ user.cpp: In function ‘int valid(int, int)’: user.cpp:75:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[node].size(); i++) ~^~~~~~~~~~~~~~~ user.cpp: In function ‘void euler(int)’: user.cpp:97:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[node].size(); i++) ~^~~~~~~~~~~~~~~ user.cpp:96:9: warning: unused variable ‘ok’ [-Wunused-variable] int ok=1; ^~ user.cpp: In function ‘void read()’: user.cpp:23:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&n,&m); ^ user.cpp:26:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&x,&y); ^