Compilare: main.cpp: In function 'int main()': main.cpp:9:24: warning: unused variable 'i2' [-Wunused-variable] int n,m,i,j,ans,nr,i2,j2,act,s,mi,k; ^~ main.cpp:9:27: warning: unused variable 'j2' [-Wunused-variable] int n,m,i,j,ans,nr,i2,j2,act,s,mi,k; ^~ main.cpp:9:34: warning: unused variable 's' [-Wunused-variable] int n,m,i,j,ans,nr,i2,j2,act,s,mi,k; ^ main.cpp:7:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("peri.in","r",stdin); ^ main.cpp:8:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("peri.out","w",stdout); ^