Compilare: user.cpp: In function ‘void solve()’: user.cpp:36:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[nou.x][nou.y] == 0) ^ user.cpp:36:31: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[nou.x][nou.y] == 0) ^ user.cpp:38:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[nou.x][nou.y] = a[top.x][top.y] + 1; ^ user.cpp:38:31: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[nou.x][nou.y] = a[top.x][top.y] + 1; ^ user.cpp:38:42: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[nou.x][nou.y] = a[top.x][top.y] + 1; ^ user.cpp:38:49: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[nou.x][nou.y] = a[top.x][top.y] + 1; ^ user.cpp: In function ‘int main()’: user.cpp:49:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("alee.in", "r", stdin); ^ user.cpp:50:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("alee.out", "w", stdout); ^ user.cpp:52:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &m); ^ user.cpp:56:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &t1, &t2); ^ user.cpp:59:45: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &x1, &y1, &x2, &y2); ^