Compilare: user.cpp: In function ‘int main()’: user.cpp:38:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] ++c[ is[now][i] ]; ^ user.cpp:39:39: warning: array subscript has type ‘char’ [-Wchar-subscripts] now = now - v[ is[now][i] ]; ^ user.cpp:12:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sant.in","r",stdin); ^ user.cpp:13:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sant.out","w",stdout); ^ user.cpp:17:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&S,&N,&C); ^ user.cpp:18:55: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(i = 1; i <= C; ++i) scanf("%d %d",&v[i],&c[i]); ^