Compilare: main.cpp: In function 'bool apare(int)': main.cpp:7:9: warning: statement has no effect [-Wunused-value] for(it;it!=m[x%MOD].end();it++){ ^ main.cpp: In function 'void sterge(int)': main.cpp:19:9: warning: statement has no effect [-Wunused-value] for(it;it!=m[x%MOD].end();it++){ ^ main.cpp: In function 'int main()': main.cpp:35:22: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&n); ^ main.cpp:38:29: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&c,&x); ^