Compilare: user.cpp: In function ‘void nivel()’: user.cpp:80:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<niv[nivmax].size(); ++j) ^ user.cpp:83:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=0; k<L[vf].size(); ++k) ^ user.cpp: In function ‘void pd()’: user.cpp:102:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<niv[i].size(); ++j) ^ user.cpp: In function ‘void citire()’: user.cpp:33:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d\n", &n); ^ user.cpp:34:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d ", &M[1]); ^ user.cpp:38:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d ", &M[i]); ^ user.cpp:44:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d\n", &a, &b); ^