Compilare: user.cpp: In function ‘int main()’: user.cpp:12:19: warning: variable ‘r’ set but not used [-Wunused-but-set-variable] long long i, j, r, pas, maxs, l, s, st, dr, ans, mid; ^ user.cpp:12:22: warning: unused variable ‘pas’ [-Wunused-variable] long long i, j, r, pas, maxs, l, s, st, dr, ans, mid; ^ user.cpp:12:33: warning: unused variable ‘l’ [-Wunused-variable] long long i, j, r, pas, maxs, l, s, st, dr, ans, mid; ^ user.cpp:13:53: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%lld%lld%lld%lld", &n, &m, &c, &cate); ^ user.cpp:14:58: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%lld%lld%lld%lld%lld", &x, &y, &z, &w, &u); ^ user.cpp:16:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%lld", &v[1][j]); ^ user.cpp:18:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%lld", &v[i][1]); ^