Compilare: user.cpp: In function ‘int main()’: user.cpp:69:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int ind = 0; ind < I.size(); ind++){ ^ user.cpp:71:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(x == y && ins[x] == 1 && ind != I.size() - 1) ^ user.cpp: In function ‘char nextch()’: user.cpp:10:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, BUF_SIZE, 1, fi); ^