Compilare: user.cpp: In function ‘int main()’: user.cpp:33:30: 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:100:16: warning: ‘fc’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(f[fl][fc]==1){ ^ user.cpp:100:16: warning: ‘fl’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:84:16: warning: ‘sc’ may be used uninitialized in this function [-Wmaybe-uninitialized] f[sl][sc]=1; ^ user.cpp:84:16: warning: ‘sl’ may be used uninitialized in this function [-Wmaybe-uninitialized]