Compilare: user.cpp: In function ‘int main()’: user.cpp:141:23: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[256]’ [-Wformat=] scanf("%s", &S); ^ user.cpp:136:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bmatrix.in", "r", stdin); ^ user.cpp:137:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bmatrix.out", "w", stdout); ^ user.cpp:138:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &N, &M); ^ user.cpp:141:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", &S); ^