Compilare: user.cpp: In function ‘char compute(int)’: user.cpp:36:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(;L[i]<l[i].size() && l[i][ L[i] ]<=cnt;L[i]++); ^ user.cpp:39:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j==l[i].size()) continue; ^ user.cpp: In function ‘void read()’: user.cpp:17:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n",&n); ^ user.cpp:18:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",s+1); ^ user.cpp: In function ‘char compute(int)’: user.cpp:46:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:67:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("calandrinon.in","r",stdin); ^ user.cpp:68:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("calandrinon.out","w",stdout); ^