Compilare: main.cpp: In function 'long long int calc(int, int)': main.cpp:31:36: warning: array subscript has type 'char' [-Wchar-subscripts] for(r=sol[x+1][y-1]+prices[s[x]][s[y]],i=2;i<y-x;i+=2) { ^ main.cpp:31:42: warning: array subscript has type 'char' [-Wchar-subscripts] for(r=sol[x+1][y-1]+prices[s[x]][s[y]],i=2;i<y-x;i+=2) { ^ main.cpp: In function 'void read()': main.cpp:17:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n%s",&n,s); ^ main.cpp:23:38: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&prices[i][j]); ^ main.cpp: In function 'int main()': main.cpp:47:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("redu.in","r",stdin); ^ main.cpp:48:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("redu.out","w",stdout); ^