Compilare: user.cpp: In function ‘int main()’: user.cpp:131:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1; i <= N; i++) { ^ user.cpp:138:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < M; i++) { ^ user.cpp:144:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1; i <= freq[0]; i++) { ^ user.cpp:147:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 1; j < M; j++) { ^ user.cpp:149:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1; i <= freq[j]; i++) { ^ user.cpp:152:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < M; i++) { ^ user.cpp:154:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (k = 0; k <= freq[j] && k < M; k++) { ^ user.cpp:154:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (k = 0; k <= freq[j] && k < M; k++) { ^ user.cpp:159:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < M; i++) { ^ user.cpp:123:10: warning: unused variable ‘add’ [-Wunused-variable] ll int add; ^ user.cpp: In function ‘char getChar(FILE*)’: user.cpp:80:32: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, Dragoste, f); ^ user.cpp: In function ‘int main()’: user.cpp:168:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("raco.out", "w", stdout); ^