Compilare: user.cpp: In function ‘int main()’: user.cpp:21:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d\n", &n, &m); ^ user.cpp:25:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%c", &mt[i][j]); ^ user.cpp:54:16: warning: ‘dj’ may be used uninitialized in this function [-Wmaybe-uninitialized] b[sj][dj] = 1; ^ user.cpp:54:16: warning: ‘sj’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:38:16: warning: ‘dr’ may be used uninitialized in this function [-Wmaybe-uninitialized] a[sr][dr] = 1; ^ user.cpp:38:16: warning: ‘sr’ may be used uninitialized in this function [-Wmaybe-uninitialized]