Compilare: user.cpp: In function ‘void bfs(int)’: user.cpp:36:41: 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:141:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<g[i].size(); j++) ^ user.cpp:113:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d", &n, &m); ^ user.cpp:116:49: 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); ^ user.cpp:108:9: warning: ‘start’ may be used uninitialized in this function [-Wmaybe-uninitialized] int start; ^