Compilare: main.cpp: In function 'int main()': main.cpp:39:26: warning: array subscript has type 'char' [-Wchar-subscripts] fr[l2-'0'][l1='0']=1; ^ main.cpp:30:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("nrcuv.in", "r", stdin); ^ main.cpp:31:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("nrcuv.out", "w", stdout); ^ main.cpp:33:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n", &n, &m); ^ main.cpp:37:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%c %c\n", &l1, &l2); ^ main.cpp:39:26: warning: array subscript is above array bounds [-Warray-bounds] fr[l2-'0'][l1='0']=1; ~~~~~~~~~~~~~~~~~^