Compilare: main.cpp: In function 'int main()': main.cpp:26:29: warning: array subscript has type 'char' [-Wchar-subscripts] dp[i][i + 1] = cost[s[i]][s[i + 1]]; ^ main.cpp:26:39: warning: array subscript has type 'char' [-Wchar-subscripts] dp[i][i + 1] = cost[s[i]][s[i + 1]]; ^ main.cpp:30:46: warning: array subscript has type 'char' [-Wchar-subscripts] dp[i][j] = dp[i + 1][j - 1] + cost[s[i]][s[j]]; ^ main.cpp:30:52: warning: array subscript has type 'char' [-Wchar-subscripts] dp[i][j] = dp[i + 1][j - 1] + cost[s[i]][s[j]]; ^ main.cpp:13:33: 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:14:35: 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); ^ main.cpp:15:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &n); ^ main.cpp:16:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s", s + 1); ^ main.cpp:19:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &cost[i][j]); ^