Compilare: user.cpp: In function ‘int main()’: user.cpp:21:46: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(int i=1;i<n;i++) dp[i][i+1]=cost[s[i]][s[i+1]]; ^ user.cpp:21:54: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(int i=1;i<n;i++) dp[i][i+1]=cost[s[i]][s[i+1]]; ^ user.cpp:29:65: warning: array subscript has type ‘char’ [-Wchar-subscripts] dp[i][i+l]=min(dp[i][i+l],dp[i+1][k-1]+cost[s[i]][s[k]]+dp[k+1][i+l]); ^ user.cpp:29:71: warning: array subscript has type ‘char’ [-Wchar-subscripts] dp[i][i+l]=min(dp[i][i+l],dp[i+1][k-1]+cost[s[i]][s[k]]+dp[k+1][i+l]); ^ user.cpp:10:33: 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:11:35: 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:12:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:13:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",s+1); ^ user.cpp:18:48: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&cost['a'+i-1]['a'+j-1]); ^