Compilare: main.cpp: In function 'int main()': main.cpp:19:57: warning: array subscript has type 'char' [-Wchar-subscripts] for (char c='a'; c<='z';scanf("%u", &letterwidth[c++])); ^ main.cpp:27:35: warning: array subscript has type 'char' [-Wchar-subscripts] crt += letterwidth[text[i]]; ^ main.cpp:33:45: warning: array subscript has type 'char' [-Wchar-subscripts] crt += letterwidth[text[i+j]]; ^ main.cpp:15:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("texttrim.in", "r", stdin); ^ main.cpp:16:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("texttrim.out", "w", stdout); ^ main.cpp:18:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%u", &letterwidth[' ']); ^ main.cpp:19:5: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] for (char c='a'; c<='z';scanf("%u", &letterwidth[c++])); ^~~ main.cpp:21:26: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(text, L, stdin); ^ main.cpp:22:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%llu", &maxW); ^