Compilare: user.cpp: In function ‘void bkt(int, int)’: user.cpp:23:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pos == p.size()) ^ user.cpp:25:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<p.size(); i++) ^ user.cpp:27:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<p.size(); i++) ^ user.cpp:30:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<p.size(); i++) ^ user.cpp:48:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=pos+1; i<p.size(); i++) ^ user.cpp:56:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<=p.size(); j++) ^ user.cpp: In function ‘int main()’: user.cpp:71:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trapeze.in", "r", stdin); ^ user.cpp:72:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trapeze.out", "w", stdout); ^ user.cpp:74:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^