Compilare: user.cpp: In function ‘void solve()’: user.cpp:62:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < G[nod].size(); i++) { ~~^~~~~~~~~~~~~~~ user.cpp: In function ‘void read()’: user.cpp:36:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(pFile, "%d %d", &n, &m); ^ user.cpp:40:43: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(pFile, "%d %d %d", &x, &y, &dist); ^