Compilare: user.cpp: In function ‘void bfs(int)’: user.cpp:39:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[from].size(); i ++) ^ user.cpp: In function ‘int main()’: user.cpp:135:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g2[x].size(); i ++) ^ user.cpp:137:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i < vec[x].size() && (y == e[vec[x][i]].to || y == e[vec[x][i]].from)) ^ user.cpp:143:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g2[x].size(); i ++) ^ user.cpp:88:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&m); ^ user.cpp:91:47: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d %d",&e[i].from,&e[i].to); ^