Compilare: user.cpp: In function ‘long int calcDP(long int, long int)’: user.cpp:17:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] dp[l][r] = c[s[l]][s[r]]; ^ user.cpp:17:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] dp[l][r] = c[s[l]][s[r]]; ^ user.cpp:24:102: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(j=l+1;j<=r;j+=2) dp[l][r]=min(dp[l][r],calcDP(l,i-1)+calcDP(i+1,j-1)+calcDP(j+1,r)+c[s[i]][s[j]]); ^ user.cpp:24:108: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(j=l+1;j<=r;j+=2) dp[l][r]=min(dp[l][r],calcDP(l,i-1)+calcDP(i+1,j-1)+calcDP(j+1,r)+c[s[i]][s[j]]); ^ user.cpp: In function ‘int main()’: user.cpp:38:30: warning: array subscript has type ‘char’ [-Wchar-subscripts] scanf("%ld",&c[c1][c2]); ^ user.cpp:38:34: warning: array subscript has type ‘char’ [-Wchar-subscripts] scanf("%ld",&c[c1][c2]); ^ user.cpp:32:33: 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); ^ user.cpp:33:35: 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); ^ user.cpp:35:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld\n%s\n",&n,s+1); ^ user.cpp:38:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld",&c[c1][c2]); ^