Compilare: user.cpp: In function ‘bool verif(int, int, int, int)’: user.cpp:60:49: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(a[i][j]==-1 || a[i][j]>a[i_prec][j_prec] && a[i][j]!=0) ^ user.cpp: In function ‘void algo()’: user.cpp:95:66: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(a[i_urmator][j_urmator]==schimbari.length()) ^ user.cpp:102:66: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(a[i_urmator][j_urmator]==schimbari.length()) ^ user.cpp: In function ‘void read()’: user.cpp:19:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &m); ^ user.cpp: In function ‘int verif_schimbari(int)’: user.cpp:54:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:133:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cobai.in", "r", stdin); ^ user.cpp:134:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cobai.out", "w", stdout); ^