Compilare: user.cpp: In function ‘void solve()’: user.cpp:75:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, nn, mm; ^ user.cpp:75:15: warning: variable ‘nn’ set but not used [-Wunused-but-set-variable] int i, j, nn, mm; ^ user.cpp:75:19: warning: variable ‘mm’ set but not used [-Wunused-but-set-variable] int i, j, nn, mm; ^ user.cpp: In function ‘void readFile()’: user.cpp:36:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d%d", &n, &m, &k); ^ user.cpp:41:82: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d%d%d%d", &v[i].x1, &v[i].y1, &v[i].x2, &v[i].y2, &v[i].nr); ^