Compilare: main.cpp: In function 'void read()': main.cpp:37:11: warning: unused variable 'k' [-Wunused-variable] int x,k; ^ main.cpp: In function 'void back(int)': main.cpp:68:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int r=0;r<t[i].size();++r) ~^~~~~~~~~~~~ main.cpp: In function 'void solve()': main.cpp:97:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0;k<t[i].size();++k) ~^~~~~~~~~~~~ main.cpp:144:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0;k<t[i].size();++k) ~^~~~~~~~~~~~ main.cpp:171:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0;k<t[i].size();++k) ~^~~~~~~~~~~~ main.cpp:183:23: warning: unused variable 'j' [-Wunused-variable] int scandura,pasi,j,k; ^ main.cpp:183:25: warning: unused variable 'k' [-Wunused-variable] int scandura,pasi,j,k; ^ main.cpp: In function 'void back(int)': main.cpp:71:41: warning: iteration 4004 invokes undefined behavior [-Waggressive-loop-optimizations] for(int j=1;j<=NMAX;++j) c[j][k]=0; ~~~~~~~^~ main.cpp:71:22: note: within this loop for(int j=1;j<=NMAX;++j) c[j][k]=0; ~^~~~~~ main.cpp: In function 'void solve()': main.cpp:82:20: warning: iteration 4004 invokes undefined behavior [-Waggressive-loop-optimizations] c[i][1]=1; ~~~~~~~^~ main.cpp:80:22: note: within this loop for(int i=1;i<=NMAX;i++) ~^~~~~~