Compilare: user.cpp: In function ‘int main()’: user.cpp:52:78: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(lc>=1&&cc>=1&&lc<=n&&cc<=n&&(a[2][lc][cc]==0||a[2][lc][cc]<=k1&&a[2][lc][cc]>0)) ^ user.cpp:9:28: 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:10:30: 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); ^ user.cpp:11:51: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d%d%d%d",&n,&k1,&k2,&l1,&c1,&l2,&c2); ^ user.cpp:15:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[1][i][j]); ^