Compilare: main.cpp: In function 'void build(int)': main.cpp:75:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (lg[index] < L[index].size()) lg[index]*=2; ~~~~~~~~~~^~~~~~~~~~~~~~~~~ main.cpp:78:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=lg[index];i<=lg[index]+L[index].size()-1;i++){ ~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:157:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<L.size();i++){ ~^~~~~~~~~ main.cpp:145:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pandemie.in","r",stdin); ^ main.cpp:146:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pandemie.out","w",stdout); ^ main.cpp:147:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ main.cpp:149:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&a,&b); ^ main.cpp:163:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&Q); ^ main.cpp:165:43: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&q[i].first,&q[i].second); ^