Compilare: user.cpp: In function ‘int main()’: user.cpp:125:38: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (s[i]==' ') op++, v[op]=0; ^ user.cpp:126:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] else v[op]=v[op]*10+s[i]-'0'; ^ user.cpp:126:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] else v[op]=v[op]*10+s[i]-'0'; ^ user.cpp:99:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("distante.in","r",stdin); ^ user.cpp:100:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("distante.out","w",stdout); ^ user.cpp:102:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n",&T); ^ user.cpp:107:16: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^ user.cpp:120:16: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^ user.cpp:136:20: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s); ^ /tmp/ccagKSZ5.o: In function `main': user.cpp:(.text.startup+0x7e): warning: the `gets' function is dangerous and should not be used.