Compilare: In file included from /usr/include/c++/6/cassert:44:0, from user.cpp:2: user.cpp: In function ‘int main()’: user.cpp:52:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(OX.size() == N && OY.size() == N); ~~~~~~~~~~^~~~ user.cpp:52:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(OX.size() == N && OY.size() == N); ~~~~~~~~~~^~~~ user.cpp:42:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&N); ^ user.cpp:45:51: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&P[i].first,&P[i].second); ^ user.cpp:69:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&M); ^ user.cpp:72:53: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d %d",&tmp[0],&tmp[1],&tmp[2]); ^