Compilare: user.cpp: In function ‘void parcurgere(int, int)’: user.cpp:75:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j<line[i].size() && line[i][j+1]==line[i][j]+1 && seen[i][j+1]==0){ ^ user.cpp: In function ‘int main()’: user.cpp:140:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<line[i].size();j++){ ^ user.cpp: In function ‘char nextch()’: user.cpp:13:36: 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); ^