Compilare: user.cpp: In function ‘int explod(int, int)’: user.cpp:25:10: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (i1>=0 && i1<=m && j1>=1 && j1<=n) ^ user.cpp: At global scope: user.cpp:35:6: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type] main() ^ user.cpp: In function ‘int main()’: user.cpp:113:9: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (a[i+di[d-1]][j+dj[d-1]]=='5' || a[i+di[d-1]][j+dj[d-1]]=='8') ^