Compilare: user.cpp: In function ‘void bfs(int)’: user.cpp:33:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<layer[i].size(); ++j) ^ user.cpp:36:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k=0; k<T[x].size(); ++k) ^ user.cpp: In function ‘void decompose()’: user.cpp:54:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j<layer[i].size(); ++j) ^ user.cpp:59:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k=0; k<T[x].size(); ++k) ^ user.cpp:61:37: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if (T[x][k] != f[x] && which == 0 || value[which] < value[T[x][k]]) ^ user.cpp:85:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0; j < layer[i].size(); ++j) ^ user.cpp: In function ‘int main()’: user.cpp:160:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<ans.length(); ++i) ^ user.cpp:134:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("parb.in","r",stdin); ^ user.cpp:135:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("parb.out","w",stdout); ^ user.cpp:137:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %s",&n,c+1); ^ user.cpp:141:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d",&a,&b); ^