Compilare: user.cpp: In function ‘int main()’: user.cpp:137:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0;k<pre[j].size();k++) ^ user.cpp:68:9: warning: unused variable ‘Source’ [-Wunused-variable] int Source=0; ^ user.cpp:115:13: warning: unused variable ‘sum’ [-Wunused-variable] int sum=0; ^ user.cpp:121:9: warning: unused variable ‘x’ [-Wunused-variable] int x=GetMaxFlow(0,cnt+50); ^ user.cpp:63:38: 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:64:40: 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:65:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:66:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",s+1); ^ user.cpp:97:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("\n%c %c",&c1,&c2); ^