Compilare: main.cpp: In function 'long long int eval_x(int, int)': main.cpp:109:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(ok<fixed_x[x].size()&&fixed_x[x][ok].second!=-1) ~~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:124:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("tower.in","r",stdin); ^ main.cpp:125:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("tower.out","w",stdout); ^ main.cpp:127:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%i%i",&m,&n); ^ main.cpp:130:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%i%i",&total,&add); ^ main.cpp:133:42: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%i%i",&inp[i].x,&inp[i].y); ^ main.cpp:139:59: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%i%i%i",&inp[i].x,&inp[i].y,&inp[i].points); ^