Compilare: user.cpp: In function ‘int main()’: user.cpp:59:21: warning: statement has no effect [-Wunused-value] D[i][j] == -1; ^ user.cpp:64:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<L[1].size();i++) ^ user.cpp:68:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<L[i].size();j++) { ^ user.cpp: In function ‘int numar()’: user.cpp:25:40: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, DIMBUFF, in); ^ user.cpp:34:40: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, DIMBUFF, in); ^