Compilare: user.cpp: In function ‘void fill(int, int)’: user.cpp:8:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (t[i+1][j]>=q) fill(i+1,j); ^ user.cpp:9:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (t[i][j+1]>=q) fill(i,j+1); ^ user.cpp:10:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (t[i-1][j]>=q) fill(i-1,j); ^ user.cpp:11:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (t[i][j-1]>=q) fill(i,j-1); ^ user.cpp: In function ‘int main()’: user.cpp:29:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (t[i][j]>=q){ ^ user.cpp:14:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sahara.in","r",stdin); ^ user.cpp:15:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sahara.out","w",stdout); ^ user.cpp:16:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&m,&q); ^ user.cpp:17:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&nr); ^ user.cpp:20:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d%d",&x1,&y1,&x2,&y2,&l); ^