Compilare: user.cpp: In function ‘int main()’: user.cpp:19:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] l[i][v[k]]++; ^ user.cpp:20:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] c[j][v[k]]++; ^ user.cpp:8:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("qmatrix.in", "r", stdin); ^ user.cpp:9:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("qmatrix.out", "w", stdout); ^ user.cpp:12:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d\n", &n, &x, &y, &q); ^ user.cpp:32:39: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c%d%d\n", &cr, &k, &p); ^