Compilare: user.cpp: In function ‘int main()’: user.cpp:21:14: warning: array subscript has type ‘char’ [-Wchar-subscripts] yes[x][y] = yes[y][x] = 1; ^ user.cpp:21:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] yes[x][y] = yes[y][x] = 1; ^ user.cpp:21:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] yes[x][y] = yes[y][x] = 1; ^ user.cpp:21:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] yes[x][y] = yes[y][x] = 1; ^ user.cpp:14:36: 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); ^ user.cpp:15:38: 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); ^ user.cpp:17:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n", &n, &m); ^ user.cpp:20:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c %c\n", &x, &y); ^