Compilare: main.cpp: In function 'void dfs(int)': main.cpp:17:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'void dfs2(int)': main.cpp:38:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<w[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'int cupleaza(int)': main.cpp:47:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<w[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp:55:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<w[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:69:35: warning: unused variable 'ok' [-Wunused-variable] int n,m,i,x,y,j,sources,sinks,ok,dead,es,ed; ^~ main.cpp:69:38: warning: unused variable 'dead' [-Wunused-variable] int n,m,i,x,y,j,sources,sinks,ok,dead,es,ed; ^~~~ main.cpp:69:43: warning: unused variable 'es' [-Wunused-variable] int n,m,i,x,y,j,sources,sinks,ok,dead,es,ed; ^~ main.cpp:69:46: warning: unused variable 'ed' [-Wunused-variable] int n,m,i,x,y,j,sources,sinks,ok,dead,es,ed; ^~ main.cpp:70:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&n,&m); ^ main.cpp:72:34: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&x,&y); ^