Compilare: user.cpp: In function ‘int main()’: user.cpp:18:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < strlen(a); i++) ~~^~~~~~~~~~~ user.cpp:19:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] sum += l[a[i]]; ^ user.cpp:26:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < strlen(a); i++) ~~^~~~~~~~~~~ user.cpp:28:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (sum + l[a[i]] > w - 3) ^ user.cpp:34:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] sum += l[a[i]]; ^ user.cpp:10:36: 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); ^ user.cpp:11:38: 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); ^ user.cpp:12:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf(" %d ", &l[' ']); ^ user.cpp:14:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf(" %d ", &l[i]); ^ user.cpp:15:26: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(a, NMAX, stdin); ^ user.cpp:16:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf(" %d ", &w); ^