Compilare: user.cpp: In function ‘void readFile()’: user.cpp:66:12: warning: unused variable ‘nr’ [-Wunused-variable] int i, nr; ^ user.cpp: In function ‘void solve()’: user.cpp:96:12: warning: unused variable ‘k’ [-Wunused-variable] int i, k = 0; ^ user.cpp: In function ‘void readFile()’: user.cpp:64:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &n); ^ user.cpp:69:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &v[i].nr); ^