Compilare: user.cpp: In function ‘void tare_conex(int)’: user.cpp:42:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<a[x].size();i++) ^ user.cpp: In function ‘void make_a(int, int)’: user.cpp:76:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<b[x].size() && z==0;i++) ^ user.cpp: In function ‘void solve()’: user.cpp:105:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<sol.size();i++) ^ user.cpp:110:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<a[i].size();j++) ^ user.cpp:117:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<sol.size();i++) ^ user.cpp:121:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<sol.size();i++) ^ user.cpp:126:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<sol.size();j++) ^ user.cpp:160:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<sol.size();i++) ^ user.cpp:179:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<sol.size();i++) ^ user.cpp:193:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<sol.size();i++) ^ user.cpp:195:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<sol.size();j++) ^ user.cpp:96:13: warning: unused variable ‘k’ [-Wunused-variable] int i,j,k,ok,ok1,ok2; ^ user.cpp:96:15: warning: unused variable ‘ok’ [-Wunused-variable] int i,j,k,ok,ok1,ok2; ^ user.cpp: In function ‘void read()’: user.cpp:28:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.cpp:31:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&x,&y); ^