Compilare: user.cpp: In function ‘bool verif(int, int, int, int)’: user.cpp:40:29: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(cond1==1 && cond2==0 && mat[i][j]<=k1 || mat[i][j]==0) ^ user.cpp:44:29: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(cond1==1 && cond2==1 && (mat[i][j]>=k2 || mat[i][j]<=k1) || mat[i][j]==0) ^ user.cpp: In function ‘int main()’: user.cpp:81:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("vis.in", "r", stdin); ^ user.cpp:82:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("vis.out", "w", stdout); ^