Compilare: user.cpp: In function ‘int exist(int, int)’: user.cpp:60:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<v[i].size();j++) { ^ user.cpp:62:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] modul(x[v[i][j]]-x[p])<=mid&&modul(y[v[i][j]]-y[p])<=mid) ^ user.cpp:62:66: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] modul(x[v[i][j]]-x[p])<=mid&&modul(y[v[i][j]]-y[p])<=mid) ^ user.cpp: In function ‘int tryit()’: user.cpp:76:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<v[hh].size();j++) ^ user.cpp:77:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (x[v[hh][j]]/mid==xa&&y[v[hh][j]]/mid==ya) ^ user.cpp:77:56: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (x[v[hh][j]]/mid==xa&&y[v[hh][j]]/mid==ya) ^ user.cpp: In function ‘int main()’: user.cpp:91:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,a,b; ^ user.cpp:93:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("harta2.out","w",stdout); ^ user.cpp: In constructor ‘instream::instream(const char*)’: user.cpp:19:44: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer,SIZE,1,input_file); ^ user.cpp: In member function ‘void instream::advance()’: user.cpp:41:48: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer,SIZE,1,input_file); ^