Compilare: main.cpp: In function 'int getnum(char*, int&)': main.cpp:17:52: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 17 | while ( r[poz]==' ' || r[poz]=='\n' && poz < strlen(r) ) ++poz; | ~~~~^~~~~~~~~~~ main.cpp:17:45: warning: suggest parentheses around '&&' within '||' [-Wparentheses] 17 | while ( r[poz]==' ' || r[poz]=='\n' && poz < strlen(r) ) ++poz; | ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'void readf()': main.cpp:32:28: warning: suggest parentheses around assignment used as truth value [-Wparentheses] 32 | for (j=0; x=getnum(row, j); a[i][x]=1); | ~^~~~~~~~~~~~~~~ main.cpp:26:19: warning: unused variable 'er' [-Wunused-variable] 26 | int i, j, er, x; | ^~ main.cpp:27:14: warning: unused variable 'c' [-Wunused-variable] 27 | char c, row[512]; | ^ main.cpp: In function 'void solve()': main.cpp:38:37: warning: unused variable 'k' [-Wunused-variable] 38 | int i, j, step, minl, minc, k; | ^