Compilare: main.cpp: In function 'char adv()': main.cpp:12:29: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buffer,1,SIZE,fin); ^ main.cpp: In function 'int main()': main.cpp:139:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&c); ^ main.cpp: In function 'void solvec2()': main.cpp:110:15: warning: 'col1' may be used uninitialized in this function [-Wmaybe-uninitialized] viz[1][col1]=true; ~~~~~~~~~~~~^~~~~