Compilare: user.cpp: In function ‘int main()’: user.cpp:43:30: warning: format ‘%s’ expects argument of type ‘char*’, but argument 3 has type ‘char (*)[2]’ [-Wformat=] fscanf (fin, "%s", &s); ^ user.cpp:39:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d%d", &n, &m); ^ user.cpp:43:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%s", &s); ^ user.cpp:45:53: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d%d%d%d", &i, &j, &x, &y); ^ user.cpp:49:41: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d%d", &i, &j); ^ user.cpp:88:19: warning: iteration 9998 invokes undefined behavior [-Waggressive-loop-optimizations] while (f[d]) { ~~~^ user.cpp:87:19: note: within this loop for (d = 2; d <= MAXN * MAXN; d++) { ~~^~~~~~~~~~~~~~