Compilare: user.cpp: In function ‘int main()’: user.cpp:13:13: warning: variable ‘r’ set but not used [-Wunused-but-set-variable] int i, j, r, pas, maxs, l, st, dr, ans, mid; ^ user.cpp:13:16: warning: unused variable ‘pas’ [-Wunused-variable] int i, j, r, pas, maxs, l, st, dr, ans, mid; ^ user.cpp:13:27: warning: unused variable ‘l’ [-Wunused-variable] int i, j, r, pas, maxs, l, st, dr, ans, mid; ^ user.cpp:15:47: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%lld%d", &n, &m, &c, &cate); ^ user.cpp:16:48: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d%d%d", &x, &y, &z, &w, &u); ^ user.cpp:18:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &v[1][j]); ^ user.cpp:20:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &v[i][1]); ^