Compilare: main.cpp: In function 'void dfs(int)': main.cpp:24:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'void bellman(int)': main.cpp:50:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[nod].size();i++){ ~^~~~~~~~~~~~~~ main.cpp:44:26: warning: unused variable 'nr' [-Wunused-variable] int i,nod,vecin,cost,nr; ^~ main.cpp: In function 'void dfs2(int)': main.cpp:73:15: 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:97:30: 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:99:39: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d%d",&x,&y,&z); ^