Compilare: user.cpp: In function ‘int main()’: user.cpp:34:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(M[j].size() == x && folx == false) ^ user.cpp:39:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k = 0; k < M[ultimul].size(); ++k) ^ user.cpp:49:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if(M[j].size() == y && foly == false) ^ user.cpp:54:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k = 0; k < M[ultimul].size(); ++k) ^ user.cpp:63:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if(M[j].size() == z && folz == false) ^ user.cpp:68:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k = 0; k < M[ultimul].size(); ++k) ^ user.cpp:21:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &t); ^ user.cpp:25:48: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d%d", &n, &x, &y, &z); ^ user.cpp:28:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &a, &b);//;fin >> a >> b; ^