Compilare: user.cpp:2:10: warning: invalid suffix on literal; C++11 requires a space between literal and identifier [-Wliteral-suffix] #include <algorithm>y ^ user.cpp:2:21: warning: extra tokens at end of #include directive [enabled by default] #include <algorithm>y ^ user.cpp: In function ‘int main()’: user.cpp:30:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("wall.in","r",stdin); ^ user.cpp:31:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("wall.out","w",stdout); ^ user.cpp:32:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&z); ^