Compilare: user.cpp: In function ‘int main()’: user.cpp:118:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("teroristi.in", "r", stdin); ^ user.cpp:119:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("teroristi.out", "w", stdout); ^ user.cpp:120:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int n, m; scanf("%d%d\n", &n, &m); gets(foo); ^ user.cpp:120:49: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] int n, m; scanf("%d%d\n", &n, &m); gets(foo); ^ /tmp/ccxcG8pM.o: In function `main': user.cpp:(.text.startup+0x7e): warning: the `gets' function is dangerous and should not be used.