Compilare: user.cpp: In function ‘int main()’: user.cpp:65:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &t); ^ user.cpp:69:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d%d", &n, &m, &k); ^ user.cpp:73:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &mat[i][j]); ^ user.cpp:92:37: warning: ‘y’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(!unlocker(x, y, i)) ++nr; ^ user.cpp:92:37: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized]