Compilare: user.cpp: In function ‘int main()’: user.cpp:46:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = 0; k < v[j].size(); k++) ^ user.cpp:53:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[0].size(); i++) ^ user.cpp:22:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &n, &m); ^ user.cpp:31:42: 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, &c); ^