Compilare: user.cpp: In function ‘int main()’: user.cpp:66:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v1.size();i++) poz1[i]=poz2[i]=i; ^ user.cpp:69:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v2.size();i++) ^ user.cpp:70:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v2[i].size();j++) poz[v2[i][j]]={i,j}; ^ user.cpp:71:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v1.size();i++) ^ user.cpp:72:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<v1[poz1[i]].size();j++) ^ user.cpp:48:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("transform2.in", "r", stdin); ^ user.cpp:49:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("transform2.out", "w", stdout); ^ user.cpp:51:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:54:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^ user.cpp:60:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^