Compilare: user.cpp: In function ‘int main()’: user.cpp:79:14: warning: unused variable ‘ch’ [-Wunused-variable] char ch = fgetc(fin); ^ user.cpp:60:10: warning: unused variable ‘ch’ [-Wunused-variable] char ch = fgetc(fin); ^ user.cpp:59:32: 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:109:23: warning: ‘y2’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (viz[x2][y2] == 1) { ^ user.cpp:109:23: warning: ‘x2’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:108:21: warning: ‘y1’ may be used uninitialized in this function [-Wmaybe-uninitialized] fill(x1, y1); ^ user.cpp:108:21: warning: ‘x1’ may be used uninitialized in this function [-Wmaybe-uninitialized]