Compilare: user.cpp: In function ‘void citire()’: user.cpp:104:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(poz + v1[x1][j].size()< y1+1) ^ user.cpp:114:60: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=1;j<nr_buc[x2] && poz1+v1[x2][j].size() < y2+1 ; ++j) ^ user.cpp: In function ‘void afisare()’: user.cpp:77:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("grid.out","w",stdout); ^ user.cpp: In function ‘void citire()’: user.cpp:93:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("grid.in", "r",stdin); ^ user.cpp:94:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &k); ^ user.cpp:100:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &x1,&y1,&x2,&y2); ^