Compilare: user.cpp: In function ‘int main()’: user.cpp:74:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < T.size(); j ++) { ^ user.cpp:75:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < T[j].size(); i ++) ^ user.cpp:62:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d", &n, &m); ^ user.cpp:64:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d", &x, &y); ^