Compilare: user.cpp: In function ‘int main()’: user.cpp:38:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(r + pas < un[x].size() && un[x][r + pas] <= vsize) ^ user.cpp:16:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &M); ^ user.cpp:21:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &p, &x); ^